Avaya S8700 Maintenance Manual page 2272

Maintenance-Object Repair Procedures
CO
NT2
S/T
TE
Figure 8-95. Integrated Trunk-Side BRI, ISDN Interface Reference Points
ISDN Interface Reference Point definitions:
LT Logical Terminal
V
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
T 4-wire Basic Rate interface to a Network Termination.
TE Terminal Equipment
U Basic Rate network-side 2-wire line interface.
8-1550 Issue 1 May 2002
V
PRI
U
T
LT NT1
NT NT
2-Wire 4-Wire
NT
2-Wire
NT1
NT
2-Wire
ISDN Interface Reference Points
Primary Rate user/network (asymmetrical) trunk interface. The ECS is
4-wire Basic Rate connection to a Network Termination
PBX
NT2
4-Wire
1
NT2
4-Wire
2
TE 3
LT
4
NT
2-Wire
LT NT2
U
S/T
T
TE TE
5
PBX
S
TE
S R
Terminal
Adapter
U T
NT1
NT
4-Wire
cydfisdn RPY 072397
1
.
2
555-233-143