Lucent Technologies 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
Layers 2 and 3 
Page 5-45 ISDN PRI Layer 3 
5
nIf a routing  p referenc e is a trunk g roup  c onnec ted  to a DS1 interfac e 
ad ministered  as B8ZS or HDB3 line c od ing , it c an b e ad ministered  to 
sup p ort unrestric ted  d ata, restric ted  d ata, or both.
Given the ab ove rules, the rules for ITC are as follows:
nIf the ITC of the originating end p oints data is restric ted...

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 5-46 ISDN PRI Layer 3 
5
nFor c alls from ISDN endp oints to ISDN PRI trunks, the BC IE and  LLC IE 
are p opulated  b y the end p oint at the time the c all orig inates. Op tion 
setting s on the ISDN set determine the various BC IE and  LLC IE 
c od ep oints, suc h as transfer rate and  information typ e.
G2.2 systems implement the G3V2 eq uivalent of GRS in a...

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 5-47 ISDN PRI Layer 3 
5
nMod e 3/2 Ad ap tive
nX. 2 5
In ad d ition to the ab ove b earer c ap ab ility terms, the following  terms are used  as 
c onventions in this d isc ussion of BC COS:
nObject
 is used  as an abb reviation for any one of the following :
— extension
— trunk/trunk g roup
— AAR/ARS preference
nISDN extension
 is an ISDN BRI terminal.
nISDN...

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 5-48 ISDN PRI Layer 3 
5
— For a d ig ital d ata c all, lac king the low-layer c omp atib ility 
information element, from an ISDN extension or trunk to an 
extension, the b earer c ap ab ility p resented  to the c alled  
extension is mod e 2.
— For a c all from a non-ISDN extension or trunk, having b earer 
capability of unknown digital
, to an extension, 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 5-49 ISDN PRI Layer 3 
5
— If the two information typ es matc h, the c all is allowed . Note 
that even if the c all is allowed , you must still make sure the 
transmission fac ilities the call will use are indeed what is 
ad ministered . For examp le, if you have unrestricted
 
ad ministered  b ut the d ig ital d ata c all is mad e over restric ted...

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 5-50 ISDN PRI Layer 3 
5
nThe information typ e (restric ted  or unrestric ted) of the c alling  
extension or trunk is p resented  to the c alled  trunk g roup. This 
information typ e is d erived  in d ifferent ways d epend ing  on the c all 
type as follows:
— For a c all from a non-ISDN extension or trunk to a trunk 
g roup , the information typ e of the c...

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 5-51 ISDN PRI Layer 3 
5
— For a d ig ital d ata c all, lac king the low-layer c omp atib ility 
information element, from an ISDN extension or trunk to a 
p referenc e, the b earer c apab ility p resented  to the c alled  
p referenc e is mod e 2.
— For a c all from a non-ISDN extension or trunk, having b earer 
capability of unknown digital
, to a preferenc e,...

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 5-52 ISDN PRI Layer 3 
5
NOTE:
For any call to an ISDN preference requiring a modem 
p ool memb er, the BC COS of the trunk g roup 
assoc iated  with the analog  half of the mod em pool is 
used  to b uild  the outgoing ISDN messag e.
nThe c alled  p referenc es information typ e, taken from field 3 of the 
c alled  p referenc es BC COS, is c ompared  with 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 5-53 ISDN PRI Layer 3 
5
5. Using  this map  and  the rules from BC COS Operation above, note any 
sp ec ial c onsid erations when inc oming  c alls orig inate from the c onnec ted  
ob jec ts. For examp le, if a p artic ular routing  p referenc e is to c irc uit switc h 
c alls from an ISDN trunk group  that will b e rec eiving  d ig ital data c alls 
lac king...

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 5-54 ISDN PRI Layer 3 
5
NOTE:
In the inc oming  d irec tion, if this field  is set to ISDN exc lusive or ISDN 
p referred  and the G2.2 rec eives a TCM IE ind ic ating  ISDN fac ilities 
exc lusive or p referred , the G2.2 will not p rovide answer tone on a d ata c all.
Temporary Signaling Connections
Another c ap ab ility of user-to-user information sig naling,...