Telcordia_PUB43801_ChannelBank.pdf

(I Telcordia®

Digit,aB Channel Sank .Requ~rements .... ___ ___ ____ _ ... _. ___ ;_-?~._· .. IJ ... _"' ... _Jlk .... ·.'~.j •. :. if) l! .. ~ {P. tf"'.,!I. i 'Ie ? ,'-, iI':' _ i~ '~" __ ..... ~~_~~~~~ ... ~ .. :':' .. "~ __ '~ . .'~._._ . _______ ._ .. _____ . __ ____ _ .... _______ ... _

Telcordia Technologies Technical Reference

PUB 43801

Issue 1, November 1982

,----------------------------------------------------------------- PUB 43801

Digital Channel Bank Req uirements and Objectives

I Copyn,]ht Page

Digital Channel Bank Requirements and Objectives

Issue 1. November 1982

Prepm'ed for Tekordia Technologies, Inc. by the Globa l Services Organization.

TELCORDIA TECHNOLOGIES, INC., WAS FORMERLY KNOWN AS BELL

COMMUNICATIONS RESEARCH, INC., OR BELLCOUE. PORTIONS OF TillS

DOCUMENT, PREVIOUSLY PUBLIS,HED BY BELLCORE, MAY STILL UEFLECT THE

FOUMER NAME AS IT WAS EMBEDDED IN THE DOCUMENTATION UNDER A

--.. --- - ---PRIOR HCENSE-FROM-THEOWNERSOFTllEBELLTRADEMARK,\VlIlCH--- __ ............. - - - _ . ____ ._ LICENSE HAS NOW EXPIRED. TIlE USE 01<' THIS NA.l\lE DOES NOT SUGGEST THAT TELCORDIA TECHNOI,OGIES HAS LICENSED THE NAMES BELL, BELl, COMMUNICATIONS RESEARCH, OR BELI.COUE FOR NEW USES OR THAT THE

OWNEUS OF THE BELL TRADEMARK SI'ONSOR, ENDORSE OR ARE AFFILIATED

WITH TEI,CORDIA TECHNOLOGIES OR ITS PRODUCTS OR SERVICES IN ANY WAY

AT TIllS TIME.

Pt:B 43801 has been convert-ed TO an elecLroni(; document format. It has been altered in three respects. First, doc lUnent referl'nf:I's have been updated in th l' Heferences section to reflect the most ret'I'nt information. Second. Telcordia may hav<, been subslitut<'d for any prior reference to Bdl Communications Research or Bcllcorc. Third, Telcorclia Clicnlmay have bel'n s ubstituted fo], any prior r eference to BcllcofC' Client Company (BGG), ,mel Regional Bell Operating Company (RI30C) may have been substituted for any prior referencE' to Bell Operating Compm,y (BOC).

To obtain copies ofthis document, (;ont"'(;t your company's dO(;llHlcnt coordinator or your Tdcordia aCCoullt manager, or call 1.866.672. 6997 (from the USA) or -I- 1.7:32.6flP. fl700 (worlchvide), 01' visit our \Veb site at http: //teleco m- inio . t elco:r.dia .com .

Copyright :(;) W82 T('lcordia Technologies, Inf:. AII 1; ghts reser ved .

Trademark Acknowledgments

Tek ordia is a rcgbt.el'ed trademark o r Tekon.lia 'J'edmologies, Inc:.

UKIX is a registered tradentark of The Opel! Group in the United StaLes and ollan countl1es .

All oll ler brand or product narnes arr. trademarks uf their r espectIve companie~ or organizations.

I

I II

PUB 43801 -------------------------------------------------------------,

ISSlJ8 1, November 1982 Digital Channe! Bank Requirement!::> and Objectives

Notice of Disclaimer

• Notice of Disclaimer

This Technical Heference document (TR) is published by Te!cordia Technologies to inform the industry of the Telcordia view of proposed generic requirements on digital channel banks. The generic ""quirements contained herein are subject to r eview illld change, and superseding generic requirements regarding this subjecl:

may differ from those in this document. Telcordia reserves the right to revise t.his document for any reason (consistent with applicable provisions of the Telecommunications Act of WfJG illld applicable FCC rules).

TELCORDIA MAKES NO REPRESENTATION OR WAHHMTY, EXPRESSED OR

Il\IIPLIED, WITH RESPECT TO THE SUffiCIENCY, ACCURACY, OR UTILITY OF ANY INFOHlVIATION OR OPINION CONTAINED HI';I{F;IN.

TELCORDIA EXPRESSLY ADVISES THAT A.:""Y lTSE OF OJ? RELIANCE lTPON

SAID INFOHMATION OR OPINION IS AT THE RISK OF THE USER AND TH..>\T

TELCORDIA SHALL NOT BE LIABLE FOR ANY DAMAGE on INJURY INCURRED BY ANY PEHSON ARISING OUT OF THE SUffiCIENCY, ACCliRACY, OR l?TILITY OF ANY INFORMATION OR OPINION CONTAINED lIERE[N.

LOCAL CONDITIONS MAY GfVE RISE TO A NEED FOI< ADDITIONAL PROFgSSIONAL INVESTIGATIONS, MODIFICATIONS, 0 1< SAFEGl:ARDS TO MEET SITE. EQUIPMENT, I,NV1RONMENTAL SA.FETY, OR COMPlL"Y-SPECIFIC REQIJlltEMENTS. IN NO EVENT IS THIS INFORMATION INTENDED TO REPLACr~ FEDERAL. STATE, LOCAL, OR OTlIlm APPLICABLE CODES, LAWS.

OR m:mJLATIONS. SPECIF[C APPLICATIONS WILL CONTAIN VARIABLES

UNKNOWN TO OR BEYOND THE CONTROL OF TELCORDL\. AS A RESULT.

TELCOIWL\ CANNOT WAHRANT THAT TIlE APPLICATION OF THIS

INFO I<MATION WILL PRODUCE THE TECTI NICAL RESULT OR SAFETY

OlllGINALLY INTENDED.

This TR is not. to be construed H!:i a s uggf'st.ion to anyone lo Hlodify or change any profiuc L or sf'nice, nor does ~his TR rcpre~ent any coltuniu lLC'Jl[ by nnyone, including hut. noL limited to Telcordia, ~o purchase, manufacLure, or sell any product with t.h E' described dtararteristics.

Readers are specifically advised that any E'lltity may have nce(b, specif'ications. or requirements different from the generic df'scriptions hen·in. Therefore, anyone wishing to know any en~i~y's needs, specificat.ions, or requirements should communicate directly with that entity.

NOThing conLainecl herein shall be construed as confening by implication, estopp"l, 0)' ot.herwise any li cense Of rightlllldcr any patent, whether or n ot the use of any information herein necessarily employs an invent.ion of allY existing or la~er issued patent.

TELCORDL/; DOES NOT HEREBY HECOMMEND, APPROVE, CElr rJFY, WArmA.,,"T, GUAllANTEE, OR ENDOHSE AN Y PHODUCTS, PHOCESSES, on SEHVICES, AND NOTHI NG CONTAINED IlEUEI N [S INTENDED OR SHOULD BE

UND ERSTOOD AS ANY SUCH RECOMMENDATIO N, APPROVAL,

CERTIFICATION, WAIWANTY, GUARANTY, on ENDOHSEMENTTO ANYONE.

------_ .. _-- .. - ----.-------:::l iii I r--------------------------------------------------------------------- PUB43801 Digita l Channel Bank Requirements and Objectives Notice of Disciaimer

Issue 1. November 1982 j iv

For general infonnation about. this or any other Telcordia documents, please contact:

'I'e1cordia Technologies Customer Service Piscataway, N.! 0885·1-4156

1.8(\6.672.6997 (USA)

+ l.7:l2.G99.6700 (Worldwide)

+ J .7:J2.:336.2226 (FAX)

http://telecom- info. t e lcordi a.com

PUB 43801 -----------------------------------------------------------------.

Issue 1, November 1982

Table of Contents

Notice of Disclaimer List of Figures List of Tables .

1 Scope and Objectives

1.1 General Characteristics .

1.1 .1 peN! Line Organization.

1.1.2 DS-1 Operation .

1.1.3 D8-1C Operation

1.1.4 Tes! Requirements

1.2 Framing . . .

1.2.1 Fomlat .

Digital Channel Bank Requirements and Objectives Table of Contents

. iii

. xi xiv

1- 2 1--2 1- 2 1 -3 1- 3 1--3 1 ·3 ....... _--------............. _-------............. _---- ~.---... --

··I2.2 Ul't:of:Friin,-e-DdecfiOh--·.·-· :-

1.2.3 False Framing ...

1.2.4 HeIrame DUl'alion .

1.2.3 Signaling Freezing (New Requirement) .

1.2.6 Extended Framing (Objeclive)

1.3 Channel i\ssignment

1.4 Per-Channel Signaling

1.5 Compression Law .

1.5.1 General ..

1.5.2 CODEC Transfer Characteristi cs

15 .:3 Decision Levels t.G.,,1 Code Assigrunents .

1.5.5 Prohibited Code Words.

1.5.5 .1 Uneqllipped Chanrwls

1.5.5.2 Equipperl Channels .

1.0.6 Unequippcd Channel - Signaling .

1.G Maintenance (see a.lso PUB 4:3803)

J. D.l General .

I.G.2 Standard LeVl,1 lligiLal Signal - Digital Milliwatt 1..6.3 Carrier Group Alarm (CGA) System .

I.G.'1 Carrier Failme Alarm . . .

I.G.5 Trunk Conditioning and Coordin at.ion I.D.G Failure Scctionalization "

1.(;.6.1 Hemot.., Looping (Objective) .

1.6.7 Audible and Visual Alarm lndicators

1.6.7. 1 IndicaT.or Colors or Messages

1.7 Electrical SU·css

I. 7. 1 Lightning

1.7.2 Surge and AC Tests (Objcct.ive)

J .7.3 Supply Voltage

1.8 Operational and EnvironmenLal Consideration.s

1.8.1 Temperature and lIumidity .

1.8.2 Officc Battery Voltage Variatioll .

1.83 Balte!y Noise

...... -------.----- .--- ............ -------... --- ----1:,.::.8------- ----- - -

1 -3 1- 3 1--4 1--4 1--4 1- 4 1-;' 1-5 l-G 1-(;

l-G

I-G I-G 1-7 1-7 1-7 1-7 1--8 1-8 l--S 1-9 1-9 1·9

1-10 1-10 1-10 1-11 1-11 1-11 1-11 1·-11 1- 11 r-----------------------------------------------------------------PUB43801 Digitai Channel Bank Requirements and Objectives Table of Contents

1. 8. :~. 1 Power Source Disturbance

1.9 Physical Considerations

1.9.1 General .

1.9.2 Kquipment Size

1.9.3 Ais le Space ..

1.9.4 Fire Resistance

1.9.4. 1 Qualification Tests .

1.9.4.2 Non-Combustible Requirement .

1.9.4.:3 Flam e Retardant Materials

1.9.4.4 Bay Contlgurations ..

1.9.5 Shock amI VibJ"ation Requirement

UJ.6 Heat Release 1.>J.7 Floor Load .

1.10 Network Cons iderations

1.10.1 Compatibili ty - General .

Issue 1, November 1982

_ ____ __ _ 1.10.2 End-La-End Compatibility

1- 12 1- 12 1- 12 1- 12 1-12 1- 12 1- 12 1- 13 1- 1:\ 1- );\

1- 13 1- 14 1····14 1- 14 1- 14 1- 15

-----~ ----- 1 J:O .2~ f];"tier ·-:- - - - - ---- - ---- - - ----- -- ------ --~ ----- - - -- --- r:':-1i:;--~ ~-- ------ -i I/I· ; .

2 Voice Frequency (VF) Operating Characteristics

2. 1 General

2.1.1 Test Requirements

2. 1.2 Testing ND & D/A

2. 2 Transmission Levels (Allhe VI" Interface) .

2.2. 1 4-Wire E&M ..

2.2.2 2-Wire DPO, UPT. MFO, E&M, RPO, and [U'T .

2.3 Office Cabling Compensatioll

2/1 Channel Attenuation Versus Frequency Characterislic .

2.4.1 Requirement

2.5 Loss Stability .

2.6 Tn,eking

2.7 Four Wire Impedanc('

2.8 2-Wire Relurn Loss .

2.9 Relative Transhybrid Loss

2.10 Crossta lk

2. 11 Longitudinal Baiullce .

2.12 Noise .

2.1 2. 1 Idle Channel Noist'

2.12.2 Impulse Nobe .

2.12.:\ Signal to DbtOltion

2. 12.4 Single Pre'luenc.v Distor tion

2. 12.5 llllermodula lion Distortion

2. 1:3 Peak to Average I{atio (P/AR)

3 Signaling Characteristics

3.1 General .

;3. 1.1 Bcope :3.1.2 Test I{equirerncnts :3. U l Testing of Units.

3. 1.4 Test EquiprncJ1l .

2- 1 2- 1 2- 1 2- 1 ~-I

2- 2 2- 3 2 .) -C)

2-:3 2-3 2- 3 2--4 2--4 2--4 2····5 2- ,) 2- 6 2--6 2-6 2- 7 2-S ~-.q

2- H

:3- 1 3- 1 3- 1 3-1 3-1

PUB 43801 -----------------------------------------------------------------,

Issue 1, November 1982 Digital Channel Bank Requirements and Objectives

Table ot Contents

3.1.5 Definition of Pulsing Percent Break.

3.1.6 Solid State Cont<lcts

3.1.7 Signaling Format

3.1.8 Signaling States

;l. 2 Sleeve Ground Dial Pulse Originating Chrome! Unit (SO PO) ;3.2. 1 Intemal Resistance and Conductor Polarity

3.2.2 Immunity to AC lndllction

:3.2 .:l Sensitivity :1.2.4 Immunity to On-Hook Transients

3.2.5 ~ial Pulse Distortion

3.2.6 Dial Pube Mutilation

:3.2 .7 Sleeve Grounding Delay

3.2.8 Disconnect Time Delay.

3.2.9 Out-of-Frame - COl1dH.ioning (New Requiremen t)

3.2.10 Carlier Failure Trunk Conditioning .

3.3 Dial Pulse Originating (2-Wire) Channel Unit (DPO) .

3:3:1 ··Jntemal·Hesistance··and ConduetnrP{)].arity· . . .

3.3.2 Immunity tn AC Inductinn

3.3.3 Sensitivity

3.3.4 Immunity to On-Jl ook Transients

3.3.S Immunity to Off-Hook Trans ients 3.:15 Dial Pulse Distortion .

:3.:1.7 Out-o[-F1'nnw - Conditioning (New ltequil'CIlll'lLt ) 3.:1.8 CarTier FaiJnrp Trunk Condi tioning ..

:3.4 Dia l Pulse Terminating CIUlI111eJ Unj t (DPT) :3.4.1 Internal Resistance :1.4.2 Immunity to AC Induction :1.43 Sensiti'vity .

;1.4.'1 Inunllnity to OftcHook Tnmsif'nts :14.5 Wink DistOltion .

;\.4.0 Olll-of-Frame - Conditioning (I\('w Hequircmenr) :1.4.7 Carrier Fai lure Trunk Conditioning.

:lS E&M Lend Channel Cnits .

:\.5.1 Internal Hesistances and Potentials .

:),;'; .2 M-Lead Sensor Sellsiti vity .

:Ui.3 Dial Pulse DistorUon . .

:1.5.·1 Ollt-of.·Frame - Condit.ioning (Kew Heqllirelllenr) :3.i"i.G Carrie!" Faillu'p '!'ntnk Conditioning

;Hl Foreign Exchange Channel Unit - Station End (FXS)

3.11.1 Internal Resis tance and COllliuctol' Pola rity

3.fi l.l Loop signaling.

:3.6. 1.2 Ringing.

:3.6.2 Immnnity to AC Induction :1.6.3 Sensit.i,,;ty

3.6.3.1 Loop Signaling

:.1.6.3.2 Ground-Start Signaling .

:1.{;.3.3 Ring Trip.

:3.5.4 ~istinctive Hinging (Objective) :3.6. :; Imnllmity to On-Hook Transil'll ts :3.6.6 Dial ['Luse Distortion

3- 1 3- 2 3-2 3- 2 3--2 3--2 3- 2 3- a 3- :3 :3- 3 :3--·4 :3-4

. .~'b4 - --- ---- ------ 3- 5 3- 5 :3-- 5 :3--5 3--5 :3--6 :3--() :3- 7 :3-7 ;3- 7 :1- 7 ~-7 :\--7 :'1- 7 :1- 8 3- Cl

:1- 8 :3-..~

:i- 8 :)¥-9 :l- H 3--9 3- 9 3-9 3-D

:1- 10 :1- 10 :3-- ·]0 ;3- 10 3- 10 3--10 3- 10

,---- ------ -------- - - ----------- PUB~3801

Digital Channel Bank Requirements and Objectives Table of Conlenls

Issue 1, November 1982

3.6.7 Dial Pulse Mutilation ..

3.6.8 Pretripping

3.6.9 Disconnect Time Delay

3.6. 10 Out-of-Frame - Conditioning (New Requirement)

3.6. 11 Carrier l·'ailure Trunk Conditioning .

3.7 Foreign Exch,mge Channel Unit - Office End cr'XO)

:1.7.1 Internal Resistances

:3 .7.1.1 Loop Signaling :1.7.1.2 Ground-Start. Signaling :1.7.1.:3 Ringing

:3. 7.2 Immunity to AC Induct.ion .

3.7.;3 Sensitivity

3.7.4 Distinctive Ringing (Objective)

:3. 7.fj Immunity to False Tip Ground Signal 3.7.n Out-or-Frame - Conditioning (New Hequiremcnt) .

3.7.7 CaITier Failmc TI1111k Conditioning

· 3.8 Militifrequency Sigrialiilg (2-Wire) Origiiulliilg CW'lUld Uillt (MFa) :3.8.J lnternal Hcsistance and Conductor Poi<u-ity

3.8.2 Immunity to AC Induction.

3.iU iciensitivily .

3.8.4 Immunity to On-I look Transienls .

:l.H.5 Immunity to Off-Hook Transients .

:l.8.0 Carrier Failure Trunk Conditioning

3J) Notes fur Requirp.rnents Testing.

4 Bibliography

:J- l1 3- 11 3-11 :3- 11 :3- .11 3- 12 3- 12 3-12 3-12 3-12 :3-12 3-1:3

3-13 ;3- 13 3-14 3-14 3-11 3-1/1 3-14 3-14 3-14 a--1;5 :3·-15

Appendix A: Testing Procedures and Arrangements for Evaluating Digital Channel Banks

.'1..1 Test Equipment, Channel Arrangement, ancl Pre-Evalualion Tests A 1.1 Test ";quipmenl A.1.2 Channel An-angclllellt A.1.8 Preliminary Insj>('dion and Tesr.ing

Appendix B: Operational Characteristics and Maintenance Tests

B.l General

11. 2 PCl\'l Output Pulse Shape ..

B.:3 Special Digital Outputs

13.4 Transmit Clock Pull-In R,ulge .

13.5 Alarm Initiate Time

B.6 Automatic Alarm Rest.oral ...

B.7 Alann Hit Integrat.ion B.8 Delay Time Between CFA and Initiating Trunk Processillg B.9 Electrical Stress ..... _

13.10 Office Battery Variations _

13.11 BattNY Noise

13.12 Temperature and Humidity

13.13 Loop Timing .Ii tler TolcHUlce

A- 2 .'1.- 2 A- 2 A- :!

1-3- 1 B- 1 1-\- 1 B- 1 13--2 8-2 B-2 B-2 B-2 B- :J B-;l n-;l B-:l j vii i

Issue 1, November 1982 Digital Channel Bank Requiremonts and Objectives lable of Contents

B.13.1 Method I .

B.13.2 Method II .

Appendix C: Voice Frequency Tests

C.I General.

C.2 Transmission Levels (At the VFlnterfa(;e) C.:l Of!1ce Cabling Compensation C.4 Channel Frequency Response C.5 Loss Stability C.O Tracking ...

C.7 Four-Wire Impedance C.S Two-Wire Retllm Loss C.9 Transhybrid Loss .

C. 1O Crosstalk C.ll Longitudinal Ba.lance Methods.

______ .... __ __ ___ .G,12 Irll<: .G.ll.aJlIll'l}loise _ _ , __ .. _ . _____ --' . :_, __ 0 _ . _. _-'- ____ '- -'- -'- ' _ 0_ '

C. 13 Impulse Noise C. 14 Signal to Dist.ortion C.15 Single Frequency Distortion C. 16 Channel Distcnt.ion (P/AR)

Appendix D: Signaling Tests

D.l General .

D.2 ~;&M Lead Channell:nits .

1l.2. I Inlernal Resistanc;e~ and POI.entials 1l.2.2 Battery Voltage [or Test D.2.:3 M-Leacl Sensor Sensitivity D.2.4 Dial Pulse Distortion .

D.2.5 Carri"r Vailurc' Tnmk Processing.

IU Dial Pulse Originating (2·Wire) Channel Unit (OPO) 1).3.1 Conductor Polarity .

D.3.2 Battery Voltage for Tesl.

D.]. ;3 Immunity Lo AC Indllction .

1) .3.4 Sensitivity.

D.3.5 Immunity t.o On-Hook Transients.

D.:3.6 humunity to Off-Hook Trans ients .

D.3. 7 Dinl Pulse Dist.ortion l). il.8 Carrier Failure Trwlk Processing.

J).4 Sleeve Growld Dial Pulse Originating Channel Cnit (SDPO) .

D.4.I Internal Resist.ance and Conductor Polarity.

D.4.2 flattery Vultage for TesLs .

D.4.3 Immunity to AC Induction DA.4 Sensitivity D.1.5 Immunity Lo On-Hook Transients .

D.!J.6 Dial Pulse DistOition .

IU .7 Dial Pulse Mutilation.

D.4.B Sleeve Grounding Delay D.4.D Disconnect '11me Dday D.4.IO Carrier Failure Trunk Processing

· R-4

· B- 4

· C- 1

· C-I

· C-l

· C- I

· C- 2

· C- 2

C- 2

· C- 2

· C-3

· C....;1

· C-3

· C--4 .C~-

· C- 4

· C- G

· r;- f)

· I)- I

· f)- I

· D- I

· I)- I

· I)-I

· I)-~

· J)-~

· ])-2

· D-2

· D- 2 D-2

.0-:3

.0-:3

· U-3

· f)-il

· D- 4

· D-'I

· D-4

D- i5 .0- 5

· D-5

· D-5

· 1)-5

· D- G

· D-{;

· D - /i

· D··6 ix I r----------------------------------------------------------------- PUB 43801

Table of Contents

Issue 1. November 1982

D.G Multifrequency Signaling (~-Wire) Originating Channel Unit (M£,'O) D.5.1 Internal Resistance and Conductor Polarity D.5.2 Battery Voltage for Test ..

D.5.3 hnmunity to AC Induction ..

D.5A Sensitivity D.Ii.1i InUIllUlity to On-Hook Transients D.5.6 IHUnUllity to Off-Hook Transients

0.5.7 Carrier Failure Trunk Processing

[).6 Dial PuIse Tenninating Charme] Unit (DPT)

0.6.1 Internal Resist.ance .

D.6.2 Hattery Voltage for Test ..

D.6.:l InmlUllit.y to .'I.e Induction D.6.4 Sensiti,1ty ..

D.6.S Immunity to Oft~Hook Transients D.6.6 Wink Distort jon .

D.6.7 Carrier Failure Trunk Processing

.. ......... --D·.·fFc)l=elgn ExCi"lnge-Channel Uiiif:Sfiitioii Eii.il (FXST ·. ... ...---.

D.7.1 Internal Resist.ance and Conductor Polarity D.7.Ll Loop Signaling Option D.7.1.2 Ground-Start Signaling Option D.7.1.:3 Ringing

D.7.~ Battery Voltage for Test . .

D.7.3 Inununiry to AC Induct.ion D.7A Sensi(.ivit.y.

D.7.4.1 Loop Signaling Option D.7.4.2 Ground-Start Signaling OpLion D.7.4.cl ]ling Trip

D. 7.;'; Immunity to On-Hook Transients D.7.6 Dial Pulse DistOlt.ion D.7.7 Dial-Pulse Mutilation D.7.S PrelJ'ipping .

D.7.\) Disconnl'd Time Delay D.7.1O Carrier Failure Trunk Processing.

D.8 Forpign Exchange Channel 'Cnit . Offi <:e End (F'XO) D.S.1 Internal Resistances.

D.8. I. I Loop Signaling Option ..

D.8. I.~ Ground·St.arr. Signaling Opt.ion D.S .. I <) lUnging .

D.S.2 Battery Volt.1ge for Test . .

D.8.3 Immunity to AC Induction D.8A Sensitivity ..

D.S.fj InulIlUlity to False Tip Ground Signal D.8.G ClUTier Failure Trunk Processing

Appendix E: Test Arrangement Figures

D- 7 D- 7 D- 7 0-7 D- 7 D-7 D-8 D-S D-8 f)-8 D-8 D-8 D -I)

D-D D-9 D-9

: .. : -1')::::10 .... ··

D-lO D-lO D-I0 D-lO D-I0 D-I0 D-ll D-Il D-ll D- ll D- ll DIl D·12 D-1 2 D-12

IJ-12

D-J:l D-I :)

D- J:l I)-I ;)

f)-I:!

D-U D- l:J D-14 D-H D-15 r--'- - -' -.--.-_ .. _ .. _--.---"--'-.- - -_. _. __ ..... - -------_._--j x

PUB 43801

Issue 1 . November 1982

List of Figures

Figure 1-1 Figure 1-2 Figure l-;l Figure 1-4 FigLlfe 1-5 F'igw·c I -fi Figure 1-7 F'igure 1-8 Figure 1-9 Figure 1-10 Figure 1-1.1 Figure 1-12 Figure 1-18 FigUtelc14 · !''igure 1-15 Figure l -lG li'igure l - l7 ~'igw·e 2- 1 F'igurc 2-2 Figure 2-:3 Figure 2-4 Figure 2-5 Figure 2-6 F'igLU·e 2-7 Figure 2-8 Figure 2-U Figure 3-1 Figure :5-2 Figure ~l-3

Figw'e 3-4 Figure 8-5 Figure ~l-6 Fignre ~i-7 Fil,~.Ire :l-8 Figure :HI ~'igw·e 3-10 Figure :J-II Figure 3-12 Figure 3-13 Figure 3-14 Figure :3-15 Figure :3-16 Figlu·e :1-17 Figure A-I F'igure E-I l'lgllfl' E-~

Digltai Channel Bank Requirements and Objectives Ust of Figures

Frame Organization Assignment of S-Bit .

Channel Bank - DSX- I l?elatiOlL~hip .

DSX-I C Signal Fonnat .

Ex t.ended Framing Format Channel & Time Slot. Number Assignments Co(\ce Transfer ChaJ·aeteris tic - Infonnation Frame Codee Transfer Characteris tic - Signaling Frmne .

Code Decis.ion Levels Assignment of Transmitted Codes and Decoded Levels CFA Tinting Lightning Surge Sinm1ation Surge Test.s AC Tests :·· High Irnppdanee Inductivp Somc« Test. Circuit Battery Disturbance Test Setup l.544 Mbps Peak-to-Peaklnput Jitter Tolerance.

Tn msrnission Tes t Arrangement 4-\Vire Frequency Response Requirement 2-Wire Frequency Response Reqllirement Transhybrid Loss M.easurement.

Minimum Equal Level Coupling Loss .

Longitudi nal Balance Measmcment Setup Idle Circui t Noisc Measurements Crosst.alk Measurement Connections.

Pha,,, BOLlIIcb

DPO

DPT .

E& lVI

RPO

RJYf.

SDPO.

DX

ETO, TO

FXO

F'XS.

PLAJ{ .

I'LR.

IW .

SDPO Imlllunity 1.0 On-Hook Transients 1)1'0 Immunity to On-Hook Transients M-Lead Sen,sor Sensitivity . ..

F'XS Immunity to On-Hook Transients Pre-Testing TClllperature Cycling .

PCM Output Signal Tests.

Spc'cial Digital Outputs (C F'A and Looping) and Alann IIi t.

Integration . _ .. , 1- 17 1-18 I- J8 1- 19 1- 20 1-21 1-22 1 23 1- 24 1-24 1- 26 1- 27 1- 27 1- 28 1- 29 1- 29 1- :30 2-· 9

2- 10 2 ·11 2-- .1 2 2- 1:3 2 ·14 2- J;, 2- ](;

2- 17 :3- 15 8- 1() :)-1 n

;)-IG

:1- 17 :l-17 ;1- 17 ;3--- 1 H ;1- 18 :3 -1>!

3-20 3-20 :3-21 ~~22

:3-22 ~1-2 ~~

3- 2:1 A··5 E-2

E- 3

- - ----- -----_._--- - --·--xil

,-- ------- ---- -------------------- PUB 43801

Digital Channel Bank Requirements and Obj ectives l.ist Of f igures lssue 1, November 1982

Figure E-3 FIgure E-4 ~'igure E-5 F'igure E-6 Figure E-7 FIgure E-8 FIgure E-iJ FIgure E-I0 FIgure E-11 FIgure £ -12 FIgme E-J;)

FIgure E-14 Figure E-1 G Figure E- 1G FIgure E-1 7

Figure E-18

Figure E- 19

FIgure [':-20 Figure E-21 FIgure £-22

Figure E-23 Figure £-24

Figure E-25

Figure £ -21)

Figure E-27

Figure E-2S

FIgure E-30

Figure E-31

Figure 1<:-32

Figure 1-;-;1;3 Figure E-; ~4

Figure E-0G FigLU'e E-3C1 FIgure E-:37 F'igurc E-38

Tl'allsmil Clock Pull-in Range.

Ala1111 Timing Battery Supply Effects ..

I-,lecttical Stress Lightning Surge Simulation By Voltage Surge Batte1Y Noise Effect.s General Voice Frequency Arrangement.

4-Wire Image Impedance (Return Loss) Retum Loss (2-Wire Units) Trans Hyblid Loss .

Near End Crosstalk .

Far End Crosstalk .

Longitudinal Balance Longitudinal Balance Circuit Impulse Noise (Dial Pulsing in Channels At~jacent to Channel Under Test) Impulse Noise (J~ & M Signaling in Channels Adjacent to Chamtd Under Test) Impulse Noise (20Hz Hinging in Channel A<ijacent to Channel Under Test) Channel Distortion Peal< to Average Ratio (P/AR) .

Resistancf' and Potenlia l (E&1I1 Channel Unit.s) .

Dial Pulse Distortion ami M-Lead Sensor Sensitivity (E&IVI ChannellJnits) Inunllnity to AC Induction.

Sensith~ty and Internal Resist.1J1cP and Potential (DPO/SDPO/MFO Channel Unit) Immunity 10 Transients DPO (On Hook or orr Hool< Transients) SDPO (On Hool< Transients) ..

Dial Pulse Distortion Wit.h Loop Puls ing Applied (DPO Channel Unit) Inlernal Resistance (UPT Channel Unit) .

Ilial Pulse Distmuon Flat.t.ery and Ground Pulsing from 1 "Oil GO Ohm Source Over 600 Ohm V.F. Extension (DPO Channel []nil) Dial Pulse DistOlt.ion with Battery and GrOllild Pulsing Over

E-ti E-5 E-G E-7 E-8 E-S E- 9

E·-I0 E-···11 E--12 E- 13 E- 15 E- 17 E- 18

E- 19

E- 21

E·-23 E- 2f) E- 2"

E- 27 E- 2H

E-2D

E-30

£-31

E-32

Zero Loop (DPO/SDPO Channel Unit) . E- 33 Dial Pube Distort.ion, Loop Pulsing Applic'd , 2~IF ,md (iOO Ohm Across Pulsing Contact, 600 Ohm VF Ex tension (DPO ChDnnf'! l :nit) E-34 Ilial Pulse Distortion Loop Pulsing with 1500 Ohm Loop Hesistance (FXS, SDPO Channel Unit) ..

Dial Pulse DistOition Loop Pulsing, 15,000 Ohm Leakage, 4 Bridged Hingers (SDPO, FXS Channel Unit) Dial PulsE' Dist.ortion with Battery and Ground Pulsing and 2000 Ohm Loop (SDPO Chmmcl Unit) .

Dial Pulse Mut.ilation (SDPO, FXS Channel Uni t) .

Sleeve Ground Delay and Disconnect Delay al1d CI"A Tnmk Processing (SDPO Channel Unit) Immunity to Disconnect (SDPO Charmel Unit) Immunity to Transients (MFO Channel Unit) Sensitivity Immuni ty to Transipnts DPT Channel Cnit

E- 35

E -37 E- 38

E-39 E~jO

E-41 E-42 8-43

! xi i

PUB 43801 ---------------------------------------------------------------------.

Issue 1, November 1982

Fig ure E<l~)

Figure E-40 Figure £ -41 Figure E-42 Figure E-4~l

J'lgure E-44 Figure E-'15 Figure E-;16 Figure E-,i7 Figure E-48 Figure 1':-4H Figure f~-50 F'iglu'e E~ G.1 Figur'e £-,,2 Figure EMS:, Figure E-54 Figure E M 5;)

Figure E-5() Figure (,l:-57 Figun~ 1(> 58 Figun~ E-5U Figure E-(jO Figure E-61 Figure E-62 Figure E-63 Figure E-64 Figure E-65 Figure E-66 Figure E-67 Figure E-68 Figure E-G9 Figure E-70 Figure E-71 Figure E-72 Figure E-7:3 Figure &74 Figure E-75

Digital Channel Bank Requirements and Objectives li~1 of Figures

Wink Distort.ion (DPT ChannellJnit) , E&M Interface and Signaling Test Ckt Superimposed DC On, Ringing Ckt. _ 20 Hz Ringing PulseI' (2 Sec On - 4 Sec Of 0 Signaling Test Circuit - see General Not.e G _ Signaling Test Circuit, _ Signaling Test Cil·CUi!. - see General Note 8 .

Signaling Test Circuit.

Signaling Test Circuit.

Signaling Test Circuit .

Signaling Test Circui , .

Signaling Test Circuit .

Signaling Test Circuit .

Hold Circuit , Tip Ground Adapter , 15,000 Ohm Leakage Bridged Ringer (WECO C4A T:me Or Equivalent) , Te r!ninati on I Termination 2 Signaling Tpst. Cireui, .

Signaling Test Circuit (see General Kote 14) .

Intcmal Resistance and Conductor Polari ty (F'XS, FXO) Sensitivity (FXS Channel Unit) , Immunity t.o On-Hook Transients (FXS Channel Unit) Pretripping (FXS Channel Unit) , Disconnect. Time DeJay (F'XS) 20 liz Hinging Impedance (FXS, F'XO) Immunity to AC Induction (f'XO ChannellJnit) Sensitivity (FXO Chnnnel l]nit) , , ..

Immunity to Fuise Tip Ground Signal (FXO Channel Unit) .

Remove-Hing-Ground Time (FXO) Signaling Test Circuit. .

Signaling Test CircuiT. .

Signaling Test Circuit .

Cord Balancing Network.

Test Method I - Loop Timing Jitter Tolerance Test Meiliod II - Loop Timing Jitter Tolel'31"''' .

E-44 E-45 E-45 E~15

E-4G £'-46 E -46 E·-47 E-47 E-47 E-47 E-48 E~18

E-48 E-49 E-10 E~W

&-49 E-4(J E-50 E-50 E-51 E- 52 E--53 E- 54 E- 55 E --5(;

E - 57 E--58 E- 58 B -50 E··61 E -()J E--5 J E""/12 E -"(,:)

E "64 r---------------------------------------------------------------------PUB43801 Digital Channei Bank Requiremc::nts and Objecti ves Ust of Tables

List of Tables

Tahle A-1 Tahle A-2

Test Equipment List Channel Type Assignment for Digroups A 01· (B)

ISSU E! 1. November 1982

A- 3 A-~

PUB 43801

Issue 1, November 1982 Digital Channel Bank Requirements and Objectives

Scope and Objectives

1 Scope and Objectives

A digital chann;,1 hank is a reM voice frequency tcmlinal capahle of converting 2·1, 48, or 96 analog voice t'requeIll:y channels along with associated signa ling and alarm information into a Lfi44 (OS-I), 3.152 (\)5-1 C) or 6.132 (OS-2) Mbps digital signal suitable for t.ransmission over Bell System T-canieJ' facilities. Such a bank Inust hI' able t.o accept a signal from other digital sources which are in standard use in the Bell Syst.em such as DID, ])2, [Xl and 04 charmel hanks or other fully compatihle equivalents of these systems, process that signal internally and provide 24, 48, or 96 charmd VI" channels of toll gradp quality along "ith associatpd signaling and alarm information. Alt.hough tilis document refers only In 24 channel banks, 48, 96, or other multiples of 24 may occur and would generally be cCfvf'rf'd by these requircments.

This publication is intended to identify those adrninistrlltive, engineering, maintenance and tecJmical rcqllirements and objectives that should be met in order w insure satisfactory opc'ration in a Bell Syslem emironment. The criteriacollt.aine cl herein describes the chanlcterist.ics and features which, to the bf's! of our knowledge, will insure proper funct.ioning of the product if used by the telephone company. They are not meant to he interpreted as a complete definition of product requirernents and are subject. to changes as l'l'ollcnnics, technology an(Vor services dictat.e.

The requirements and objectives in this document havf' been set as independent of implementation as practical. There is no iHtent to inhibit. innovation. If application of new tf'chnologies is restricted by these l'equirempnts, the requin.'lllcmts Inay be reconsidered. In gc'Jlcral, a c hange will ollly be made if it is demollstrated that the Hew technology will result. in an overall improvement. in performance, or will providf> a n1ajor ecollcnnic: benefit ,·vilh ltO significant d egradation in overall service.

A~ llS f>d herein, criteria are d f'fined as AT&T standards which arc used to det.Pl'lllilH;

sllitahility for Bell Syst.em application. Some of t.hese c riteria differ from cern re('omnlendations . Technical, administrative or mainte nance critcrin lis t.ed as rmzu h'mll-enls IHust be n1(>t in order tu ensure nehvork integrity. Failure to Jl1eet rf'fjuirements could affect grade-or-senice, jeopardize service availahilit.y, r"st.ric t applicability or create excessive adlninistrative or rnainlenance burdens. Criterja identil'ied as ob.iectives are considered design target.s that are highly l'I'C01l11l1enc\f'c1.

Failure to lT1eC't objecrives m.ay restrict applications or create administ.rative or 1l1aini.f'nance problems.

The part.icular ele-etrical find physical rcquin'lltellts and objectives cited in this pllblication are baserl, in part, on Bell 8yst.C'm mainwnance and operating reqtlirement.s, Bell System voice h-equency trarL~mission objectives, Bell Laborat.mles ' efjllipmcnt and design standards, mId the attainable performance of available- manufactured products. These refjuirements and ol~ject.ivf's form a base of definitive criteria which permit assessment. of whelher pm1icular di gital channe l han ks are sltitable for use in the Bell System.

A ff'w of the requirements in t.his publication have not. been previously lis ted in flny publication. It. is not int.endf'd t hat these requirements apply ret.roactively: however , prodUCTS shipped a year after release of this [lllblication should meet all requirements. ){equ.irements fitting this <;at.egory have been so ident.ified .

---~----'--- -.---~------. --- -;::::;l

,---------------------------------------------------------------------PUB43801

Digi tal Cilannel Bank Requirements and Objectives Scope and Objectives

\ssue 1, November 1982

Some of the requirements in tltis publication may be considered "features"_ These requirements generally relate to maintenance items_ Where a product does not provide these features, network performance will not be degraded but t here may be an impact on the annual maintenance costs_ The requirements that fall in this categor'y are so marked_

The objectives listed in tbis publication arc Hot planned to become requirements in the near future; however, products meeting the objectives as well as the requirements would provide some benefit in either pelforrnance or scope of application_

Section L outlin~'s general D-bank technical , maintenance, physicaL and environmental characterisiics and provides pertinent background inL"onnation.

Section 2 highlights specific \iF operating chm'acteristics and gives recommended test methods_ Section C describes signaling interface object.ives, recommends trunk conditioning techniques and provides suggested test procedures. Section -'I is a Bibliography that lists a numher of articles, journals or tedmical documents that

--- -fila,\- be ot'soille-;lSsistancp-rii-({effniilglne iligiLiirrii.;(;ds -iinheHe1rSys(eiil~ T1ie ----- - ------ -- ------- - Appendix provides detailed tpsting procedures and test c.ircuit anangements which to the best of our knowledgE' are suitable for detcnnining if a digital channel bank meets the requirements and objectives spedfied in this Technical Reference.

1.1 General Characteristics

1.1 .1 PCM Line Organization

To insure general network integrity, digital channel banks Illust provirie peM outputs that are compatible with the digital hi erarchy _ To avoid potential administrative and maintcmmcc problp!l1s , unique rCM formats are not recommended and will generally havf' limited application.

1.1.2 DS-1 Operation

1-2

The peM line format for DS-l opf'ration, shown in F,glU-C' J -1, consists of24 eight-bit wonb and one framing bit. (S-bit.) for a total of 103 bits perfram,,_ The nominal bit rate of fl ])S-I output ~igllal is 1.1\44 megabit.s per second, and the nominal sampling rate for each message channel is 8000 heltz_ The chmmd bank DS-l output signal is bipolar', The eighth bit of endl word is used [or information five frames out of six and for signaling every sixth frame (see Figlll'c 1-:::).

The plllse shape of a DS-l pulse is defined at the DSX-l cross conned, Provide for l ISe of from 0 to 655 feet of 22 gauge ABAJliI cable between r,he channel bank and the DSX-l (see I''igme l -~: and the "Interconnection Specification for Digital Crossconnects" - Technical Advisory No. ~H).

PUB 43801 -----------------------------------------------------------------,

Issue 1. November 1982

1 .1.3 DS-1 C Operation

Digital Channel Bank Requirements and Objectives Scope and Object;ves

The peM line fOffitaL for DS-IC operation, shown in Figurf' 1-4 , is comparable to that of a MIG multip lexer which interleaves two DS-I signals. The DS-IC output is a bipolar signal at a nominal bit rate of 3.152 Megabits per second. The digroup [ra rne organization is identical to that for DS-I operation as illustrated in Sect.ion 1.2 and Section 1.'3, below.

Detailed descriptive information and t echnical criteria [or DS-Ie fonnatB are available in Tcclmical Advisory No. :34.

DS-I C criteria must. be met when the c!t,utllcl bank is () to 655 cable [ect fWIlI the DSX-l C using 22 gauge ABAM cable.

1.1.4 Test Requirements

T est. procedures alld arrangementBJorcvaluatingdigital channel banks are indudcd ..

in Appendix A. Pcrfonnance characteristics are evaluated with lest eqUipment conforming to and by techniques described ilt Bell System Technkal Reference PUB 4100!J. Measured performance mus t meet or exceed the requirement given.

1.2 Framing

1.2.1 Format

The framing bit is rime-shared to both synchronize the channel bank and jrh'11t.ify l.he s ignaling fn:uning as shown in F'igtlfC' J 2. Channel framing identifies the location of time t510t ONE and s ignaling [raIning ident.ifi es those [faIlleS in \vhi ch fwo pairs of signaling states A and B ,U'C tnUlsn-u tt.ed on a t illle shared basis (seE> Sf'ctinn l,..j).

1.2.2 Out-ot-Frame Detection

A rerrume procedure m usl st,ut when the fraetio n of the fra ming bits in error is in the nUtge from 2 out of :; to 2 out of 4.

1.2.3 False Framing

The framing s lrategy must he s llch thal channel framing s hould not falsely lock OIl

Ute sigl1aling framing.

1.2.4 Retrame Duration

Maximum average reframe tinw shall be less than 50 milliseconds in the absence of e)1'ors (rm:Lxinl111ll average refnunc tiIlle is the average tinle Lo refrllllle '~Th('n the maximum nurnber of hit positions must be examined for the framing pattern.)

1·-·3

Scope and Objectives

Issue 1. November 1982

1.2.5 Signaling Freezing (New Requirement)

On detection of loss of frame, the on-hook and off-hook signaling states presented to the d"umelunits must be maintained in the state that. existed before detection of the out of frame condition. This requires buffering of the signaling information.

Specific actions are covered for individual channel units in Section :;. The probability of freezi.ng in the "Tong signaling state for a 50 percent ones density out offrame condition must be no more than 5 percent. The signaling states must not be changed until the terminal regains synchronization or declan"s a Carrier Failure Alann.

1.2.6 Extended Framing (Objective)

Consideration should be given in new designs to including an option to provide for the extended framing format shown in Figme lor,. This format will become the

.. ·sfuiid"td· foT applic"UtWns;ln thc'jjetwol'lnhar invol vesynchronization, ·connections-· ..

betw"en intelligent terminals, or extended signaling <:al'ability. It provides protection against a synclu'onolL~ input from a customer simulating syst.em framing and locking a system out of frame in a nonalarmed slale (sec "The Ext.ended Framing Format IntmiacE' Spedficat.ion" - Te<:hnical Advisory No. 70).

USE' of the extended format will provide new options for maintenance techniques not now available. These new techniques may affect some of the alarm and maintenance status hldi cations and their Lilning. Such infonnatlon ~..vill be provided as soon as availahl" . An example of a possible change is in t.h" timing for detection of "YeHo\v Alann" \vhel'e positive indica.tions not depending on existing liInitations may elinlinate a llPpd for deJay in initiating (', " Yello'\~ Alann.·'

1.3 Channel Assignment

The e;lssignment of channel nmnoers [Hui. tjln e slot nunlbers is given in Figure 1 6.

The basic channel l1lU11LH.'1' plan isscqllenti al. Adaptors or means fUf <lC_COllllll.odating

D2 or D1D channel sequencing must also he available.

1.4 Per-Channel Signaling

The per· channel signaling information is can;ed by the built-in sigmding sysrelTI whkh uses digit 8 of the corresponding PClYl word as shown on figme 1-2. The r.ranstation of signaJing states to the bit.s tl'ansllutted on tJH~ derived signaling channel is discuss('d in Sf>ct ion ;1 for vatious channel unit 1:\1)es.

In hvo-state signalillg l chalmelnntt" nnlst disregard the received channel B signaling infomlation, except for RPT loop-dosur". This results in compatibility "ith the No.

4 ESS Digroup Terminal and the D1D bank while not degrading signaling j)('rfonnance in any of the "compatihl"" connections.

! 14 -- ---. -.-.- --- -- .------_ .. _._._-

PUB43801 ---------------------------------------------------------------------,

!SS\.H) 1. November 1982 Dig ital Channel Bank Requirements and Objectives

Scope and Objectives

1.5 Compression Law

1.5.1 General

The c:ompression law used ill the channel bank mus t t)(·, a precise piecewise linea.r approximation to a 11 ~25G law which is defined by:

[vi ~ 1,,(1 + Illxll 11= 255 In(1 +11) • where x and yare respectively t.he compressor input and output. both normalized to [mity, The charactelistics, decision levels and code assignml'nts described in Section 1.5,2.

S;~;~: ti;)" '1, c;, :J: a;;~i~~'~I;; ;; , i::54 j,:;cludetheefreci'o{cl)i;;~;i essi on andexpctnslon "c"

1 ,5.2 CODEC Transfer Characteristics

The relationshijJ between encoder c1ecisio tllevels and the decoder outpllllevds is defined by specifying the COllI-X: transfer dwracteristic.

To minimize distortion, the transfer characteristk for the abbrevia ted ' ·bit words (used during sigmiling frames) dUTers [roIII that for t.he nOl1nal 8·bi !. r CM words.

Pigurc' 1·7 shows the transfer characteristic for normal R·bit PCM words. The OlltPllt I<'"e ls (Yn's) are always midway between the decision levels (Xn's) eUtis can be termed a "decision levPl assignment" CODEC), The output levels afl' ,~iven by:

x + .Y I Y . /I n + . = :n n 1

= l. 2 .. ,J27

Figu re l·B shows rJw transfer dwractelisUc for abbreviated 7·bit PCi\1 words in the signaling frame. Except for the level closest to z<'ro , the output levels (Zn's) arf' a lso midway between the decision levels eXn's} These output levels are given by:

Z" , ~" 11 = 1 0 64 /1.2 11 -,- l ' " ..

1- 5 i

,-----------------------------------------------------------------PUB43801

Digital Cila nnei Bank Requi mments and Objectives Scope and Objectives

Issue 1. i'Jovember 1982

1.5.3 Decision Levels

r'igu)'(' 1·9 lists the relative magnitudes of the decision levels. The decision levels ,u-e placed symmetrically about zero.

The maximum deci~ion level magnitude given in Figure 1-9 has been normalized to 81,,9 so that a ll magnitudes may be represented by integer values. The magnitude of the p eak value of' a +3 dBmO, 1 kHz single·frequency signal is slightly less t.han that of the largest dpcision level. This results from the definition of a digital milliwatt given in Section Ul.2 .

1.5.4 Code Assignments

The assignments of p eM code words and decoder levels are specilied in Figure 1- 10 in t enns of coding ran ges (decision levels).

The code as~iglllllellt provides ,\ sign and ()nescortllJlement magnitudeToding, result.ing in a high ones density in the output datu stream for encoding of speech.

The W·bits defined in figluv 1·]() (peM words colwnn) are required to guarantee that the output nata stream never includes more than 1 G consecutive zeros. This is a requirement related to '1'1 line clock recovery.

1.5.5 Prohibited Code Words

1.5.5.1 Unequipped Channels

When a dannel position in the channel beak is unequippNI (unit. removed o r never inslallen), the code word(s) emilted fOf that channel time slot m ust correspond to;)

near·zero voltage signal. This 11linirnizes the d. c. s tress OIl the receiving channel unit lllter (i f present) ill till' remote tCflllimlJ cluring the timp the transmitting p()~ition is lLneqnipped in (h,' near temlinal.

Since the long Lenn presence of high level d. c. signals can perrnanently degradf' certain charlllel ullit components , it is recommended that any connecting bank also clnit code words corresponding to a lwar-ze ro decode d s ignal for an lUlequipped condition: in particular, code words cnrr"sponding to signals of either polm'ity, of magll itude grea ter than X48 (FiglU"t' ) · i·) and Figu re ]· HI), are prohibited in time slots for ullequipped ch:umel positioIls.

1.5.5.2 Equipped Channels

When the analog iJlPUI. of ml equipped channel in the channe l bank is terminated in an nppropriate idle channel impedance (wilh IlO speech or other si~Ilal energy present) the code words emitted for that channcltime slot must correspond to a near·zero voltage signal. This prevents excessive illteder""ce with digit.al processing equipment tha t may be used in t he di~ital network.

I~. - -.... -----.- ----.

I 1-6

PUB 43801 -------------------------------------------------------------,

Issue 1, November 1982 Dig ital Channel Bank Requirements and Objoctives

Scope and Object ive~

The requirement is that the code words corresponding to signals of either polarity, of magnitude greater thanXJ6 (Yigure 1-9 and Figure 1-10) are prohibited when the input to tJie channel is terminated with the appropriate impedance. Although not a n explicit previous requircment, a channel b unk could not generally meet the requirements of Sec lion 2 if it does not mcet this requirement.

The objective should be to keep th e bias suc.h that the eode words in t.he terminated condition are no greater thanX12.

1.5.6 Unequipped Channel - Signaling

AnlUlcquipped channel must resulL in a 1 ill the "A" s ignaling ch a.nnel bit in the DS- 1 bank output s ignal.

1.6 Maintenarl.ce (see also PUB 43803)

1.6.1 General

To ease installaliuu and maintemU"lce, tJle channel bank and associated test arrangements must provide adequatc' per-channel test capabiliti ps and access. Thc' following lest capabilities shall be providpd: ( 1) Office and facilit.y access at the' 2 Hll r1 4 \vire LranS1tlission and signaliu g VIi' interfaces. That is ~ the channel b,mk h ·ansmissiun alld signa ling VF inputs anrl o utputs. Examples a rf' buill-injac:ks or card pxtendcrs. (2) Transmissiun splitting access at VF ur PCIV!.

1.6.2 Standard Level Digital Signal - Digital Milliwatt

The repetitivc, transmission ofthe follm,ing sequcnce of corles in a given eltrmne.1 will be deeod.,d.in a properly align ed receiving tel"lninal ::LS OdllmO, 1 kHz signal.

DIGIT NO. 2 :3 4 f") (; ~ 8 I

0 0 0 I I 1 1 0 0 0 0 0 I 0 I () 0 (I 0 () 1 0 0 0 1 1 0 1 0 0 1 I 1 1 0 I 0 0 0 I 0 1 I 1 0 0 () I 0 1

0 0 I 1 I 1 0

An input of a OdBmO, I kHz signal to a channel of a properly aligned tnmslllitting t.erlllinal will be 'meoded s uch that a OdBmO, I kHz signal is produced in the corresponding channel of a properly aligned recei,ing terminal - t lw same as that prodncpd by the digital milliwatt.

- ---... - - -:1 1-7 I

,------------------------------------------------------------- PUB43801

Scope and Objectlves

Issue 1. November 1982

1.6.3 Carrier Group Alarm (CGA) System

A carrier group alarm system capability must be prO\ided. The combination of a Can'ier Failure Alarm (CFA) and trunk conditioning is defined as a Carrier Group Alarm (eGA) system.

1.6.4 Carrier Failure Alarm

A Carrier Failure Alanll (CFA) is delined as the detection of t.he heginning and end of a carrier system outage. A "Red Alal1n" is detined as a locally detected failure and a "Yellow Alarm" is defmed as a remotely detected failure. TIlese color indications a re useful in iden tifyi.ng the direction in which a faillU'e has occlllTed. Either a red or yellow alann slalts a CFA and t.he CFA con trols the lrunk conditioning process.

Absence of the incoming OS-lor DS-I C or loss of synchronization within the ...... rec.eivingtemunalfQu\ .ell! ritlic)!loJ2. Q .10.3. Qsec"llds .nl\J!S.t initial!" a r"dala,rI)1 .ll,Uh e local ternunal. A red alarm must cause a yellow alarm signal to be. t.ransmitted to the far end, via lhe outgoing hi t. stream . This is dOIle by forcing the seconrl hit to zero in a ll chmmels for the present f0I111at. Details have not been est.ahlished for the extended format, but. the yellow alarm information "ill be t.ransmitted in the Data Link (li'igun' j -f»). The remote channel bank Illay recognize the yellow alarm signal in less than 335 Insec. but must start the trunk conditioning process within 3:35 to 1000 ms('c. after the local temunal begall sending th0 yellow a larm signal. The terHlinal HUlst not interpret loss of incenning sig11al 3..'i a yellow al::UTIl signal.

A tenninal subject.ed to inlermittentioss of synchronization must i1uliale a red ahuHI "fter a period of integration of the s ltort out.ages. This should be done in the fullowing or an equivalenlluaIuwr. On dp.tection of an ouL of Jn une conditioll, ("Ill int.c·gration of time starLS tha t prodlle"s a red a larm after 2.0 to 3. 0 sec.onds of continuolls loss of synchronization. If r.he r.ern1inal regains s,ynchlonization, tlH:~ int.egrator must decay at a slope of from 114 t.o IllS of the rise slope.

1.6.5 Trunk Conditioning and Coordination

l :n<l"r conditions rcsulUng in failure of 2·1 or more channels in either dirf'dioll , which would be dctectc'd by tJ", Carrier F'ailure Alarm or by fuse failures , the learlB connect.ing to the central office are to he conditioned to a<:lucY<, t.he following (more clptail is given in Scc·t:ion ;3) ;

a. JVlinimize the ch,ulce of a false charge and prevent attempts to lL'C the t.runk for new calls by:

1. Giving appropriate indicat.ion per trunk group for stored program s\vitching machines.

2. Operating indhidl1al channel lllukc-busy leads for electromechanica l switching machines if available. If make-busy leads are not. avail able, then send a 2-second on·hook followed by off-hook for the duration of the failtu'c t.oward t.he originating end of one-way or either end of two ,"yay trunks.

i 1-8

PUB43801 -----------------------------------------------------------------.

Issue 1 November 1982 Digital Channel Bank Requirements and Objectives I

Scope and Objeciives I

b. Prevent scizw'e of tenninating end swit.ching equipment by sending on-hook toward the lenninating end for Ow duration of the failure.

c. Automatically restore trunks to s erviee in a coordinated manner after the trouble is deared.

Coordination is necessary for CGA removal and restoral of servi ce. Tills coordination is achieved by the timing seq1lences shown in Figuf(' l oll.

The initiation ofthe trunk conditioning process within the digital channel bank must be c:omplcted "'iihin the 2.0 to 3.0 second alarm timing interval at the local tenn inal and within t.he 335 to 1000 msee. alarm timing interval at the remote terminal.

For purposes of coordination, the remote temlinal must start trunk conditioning within :n5 to 1000 msee. of the t ime the local terminal began sending a continuol!:;

yellow signal and not releasp the trunk conditioning unt.il 20 to 1000 msce. after the removal of the ydlow signal.

'",hen the local terminal experiences 10 to 20 sec. of continuous in frame operat.ioll, ----- - - -- -it rnlJst s-t~nt restOnlr ()f service afits t~ii(r iir'a -stop fi~ris-n1issfon oITni'--y-dlu\\'--alann---- ------signal.

The renlote tenllinal rnust not restore to service if th e yelJ ovl alann si,gnal can no longer be detected dup t.o a loss of synchronization.

1.6.6 Failure Sectionalization

Each chmuICI bank mus t be equipped with a means of quickly determining whpther failure comlir.ions arp in the ch,ulnd bank 01' not. This would normally be provided by a capability of "looping" llle digital out.put. of the bank to its own digit.al input. In the looped condition. the red and yellow alarms should Hot be operatpd if the channel bank is good.

When 11 terminal is looped for testing or troubleshooling purposes. it.'; output bit sLre.arUlnnsr: consist of ones in every hit. position inclutiillg the framing bit position for the duration of the looped condition.

1.6.6. 1 Remote Looping (Objective)

Provision should be made [or optional rpmotely controlled looping of the bank.

1.6.7 Audible and Visual Alarm Indicators

Alarm features may 1Jl' implement.ed by computer software rather than hardware.

The requirements in this section generally apply where the alarms arp implemen ted in hardware.

Olllce alarms must be initiated by failmes that interrupt service and require n1ainlenanec activity. '1\\'0 or Inore contacts must he prov ided which HWy be used to provide a loop closure to o!lice alarm circuits . These contacts must be isolated from all circuit voltages, from ground, ami from pach ot.her .

------..... -.. ----.-.----- -:l.

1- 9 !

r----------------------------------------------------------------- PUB43801

Scope and Objectives

Issue 1, Novamber 1982

Ahum cut-off must be provided for manually opening the alann contacts to release the office alarms. Thi~ feature applies to fuse alam1s and may take the form of fuse removal. Act.uation of a cut-otlfeature shall not disable succeeding aimms or leave the bay with no visible alann indication.

Each terminal must be equipped with a resettable counter or other means to register the number of carrier failure almm or trunk conditioning incidents.

Alarm indicators (hardware or software) provide a llccpssary aid in determining the status of terminal equipment. As such, there should be commonality to minimize confusion of maintenmlce personnel who mus t maintain equipment of different manufacturers. The maintcnance personnel mw;t assum e that the indicators truly givc the status of alann conditions. Unless explicitly stated, indications for simultaneous events (e.g. , declare red alann and light red alann laJ11p) must occur wit.hin the normal operat.e or release times of the hm'dware or softwaJ"e llsed in the Lerminal.

1.6.7. 1 Indicator Colors or Messages

FUnction

Loss of Synchronization ,,(. Local Terminal l.oss ofSynrhronizaLion at I{emot(' Temlinal

Alarm Cut -off

POVV Cl' or Fuse i\lunn

Looped Hank

Carrier i·'ailure Alnn n

Required Color

Red

YeUow

NOl Hed or YelJow

!/ed

Not Hpd O J" ¥pllo\v y, ,,,,>\\, RC(,()llImendecl* Color

White or Green

Whi te or Gn't'n

ReCOllUnendf1d* frlessag ..

HecL RA, or R

Yel . YA. orY

ACO

FA

LOOP

CFA

* Any other indicator Jamps should not be r("·f! or yello\,"" wl less I-llf'Y show a service aHc< :ling trouble.

1.7 Electrical Stress

1.7.1 Lightning

1-- 10

Darnage Hlust not. result fro nt a voltage surge as defined in i<'lgure 1-12 . In testing, the voltage surge is applied tip Lo grouncl, tip to ring, mId tip and ring to ground at the voice frequency interface.

PUB…