Lucent Technologies DEFINITY Communications System Generic 2.2 And Generic 3 V2 DS1/CEPT1/ISDN PRI Reference Manual

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-67 Synchronization 
4
Conclusions on Synchronization
Make no assump tions reg ard ing  sync hronization. Reverify items suc h as the 
availability of a synchronization source, the clock stratum, and compatibility of 
every T1/E1 sp an. The b est g uarantee is written c onfirmation that the loc al 
exc hange c arrier, AT&T Communic ations, or other vend or will...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-68 Synchronization 
4
ISDN-PRI Trunk Facilities
I SD N -PRI  t r u n k s  m a y  t e r m in a t e  o n  a  4 ESS t o l l o ff i c e ,  5 ESS d i g it a l C O ,  Sy st e m  8 5  
R2V4, DEFINITY c ommunic ations systems, or c omp atib le vend or’s switc h. 
Dep end ing  on other c onsid erations, any of these terminating  c onnec tions may 
b e selec ted  as...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-69 Synchronization 
4
Line+Trunk Mode DS1/DMI-BOS (ANN35 or
TN767 with TN555)
Reg ard ing  the use of a line+ trunk mod e DS1/DMI-BOS for sync hronization, the 
following  p oint should  be noted . Sinc e it would  b e exp ec ted  that a line+ trunk 
mod e DS1 would  terminate at a c lass-5 or hig her CO or at another switc h, the 
line+ trunk interfac e should...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-70 Synchronization 
4
nLine-only mod e DS1/DMI should  not b e used  as system c loc k referenc es 
unless it is known for c ertain that the inc oming  DS1/DMI sig nal is loc ked  to 
the AT&T referenc e freq uenc y. Normally, a DS1/DMI fac ility terminating  
d irec tly on the far-end  D4-c hannel b ank is not loc ked  to the AT&T 
referenc e freq uenc y.
G2.2...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-71 Synchronization 
4
G3V2 Synchronization Implementation
The following  list summarizes some of the imp lementation issues involved  with 
sync hronization:
nIn a network of DEFINITY systems c onnec ted  by DS1/CEPT1 fac ilities, one 
master timing  sourc e exists. This timing  sourc e, if on a G3V2 system, is 
one of the following :
— A DS1/CEPT1 c irc uit p...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Physical Layer 
Page 4-72 Synchronization 
4
Following  are rec ommend ations for c hoosing  a sync hronization sourc e in G3V2 
systems:
nIf you have a c hoic e, use a TN767 or TN464C b efore using  a TN722 as a 
timing source.
nIf at all possible, the p rimary and sec ond ary sourc es should  be loc ated  in 
the PPN.
nYou c annot loc ate a timing sourc e in a remote p ort network...

Layers 2 and 3 
Page 5-1 Bit Oriented Signaling Layers 2 and 3 
5
DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
5
5Layers 2 and 3
This c hap ter d isc usses how various asp ec ts of layer 2 and  layer 3 p rotoc ols have 
b een d esig ned  into the DEFINITY systems. It d isc usses these sub jec ts as they 
relate to narrowb and  (64 kb p s) switc hing . 
For tec hnic al information on wid eb and  switc hing  in DEFINITY systems,...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Layers 2 and 3 
Page 5-2 Bit Oriented Signaling Layers 2 and 3 
5
mod el as layers 2 and  3 p rotoc ols. ISDN PRI sig naling , for examp le, b y d efinition 
uses the layers 2 and  3 c onc ep ts to d efine its c all c ontrol sig naling . Althoug h 
muc h less c omp lic ated , b it-oriented  sig naling  has its analog ous c all c ontrol 
struc ture (althoug h the c onc ep t of the...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Layers 2 and 3 
Page 5-3 Bit Oriented Signaling Layers 2 and 3 
5
b y the wink on a 4-wire E&M analog  trunk. When dig ital trunks first ap p eared , the 
d ec ision was mad e to d efine the sig naling  suc h that it emulated all the existing  
analog  c ases. Though d esc rib ing  the d etailed  p rotoc ols are beyond  the sc op e of 
this document, you can order the following...

DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Layers 2 and 3 
Page 5-4 ISDN PRI Layer 2 
5
G3V2 Implementation
Imp lementing the bit-oriented  c all c ontrol p rotoc ol in the G3V2 systems is 
analog ous to that of G2.2. The p rotoc ol is imp lemented  in the trunk g roup  form. 
The g roup  typ e is analog ous to the trunk typ e of G2.2. Thus, you c an enter types 
suc h as tie, CO, and  DID. Like the G2.2, you c an ad minister...