User manual

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-1274TBRI-BD (TN2185 ISDN Trunk-Side BRI)
10
Figure 10-91. Integrated Trunk-Side BRI, ISDN Interface Reference Points
ISDN Interface Reference Point definitions:
LT Logical Terminal
V Primary Rate user/network (asymmetrical) trunk interface. The
ECS is capable of acting as the user or as the network side of
this 1.544 - or 2.048-Mbps interface.
R Interface between Terminal Equipment and Network
Termination
S Basic Rate network-side 4-wire line interface
S/T 4-wire Basic Rate connection to a Network Termination
1
.
T 4-wire Basic Rate interface to a Network Termination.
2
CO
NT
2-Wire
NT
2-Wire
NT
2-Wire
NT
4-Wire
4-Wire
4-Wire
NT
2-Wire
NT
4-Wire
PBX
PBX
LT TE
TE TE
cydfisdn RPY 072397
NT2
LT
LT
NT2
NT2
Terminal
Adapter
NT2
S/T
TE
TE
NT1
V
PRI
U
U
T
S/T
T
S
S
UT
R
NT1
NT1
ISDN Interface Reference Points
1
2
3
4
5