Maintenance-Object Repair Procedures
555-233-143
8-1558 Issue 1 May 2002
Figure 8-96. 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
TE Terminal Equipment
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
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