TBRI-BD (TN2185 ISDN Trunk-Side BRI)
Issue 5 October 2002
1617
555-233-119
Figure 51.
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
U
Basic Rate network-side 2-wire line interface.
1
TN2185 ISDN-BRI 4-Wire S Interface (Trunk Side)
2
TN2185 ISDN-BRI 4-Wire S Interface (Trunk Side)
3
2-Wire ISDN-BRI circuit pack
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
U
T
R
NT1
NT1
ISDN Interface Reference Points
1
2
3
4
5