User Manual

Demand Assignment
System Overview GSI 005
605-0000-450
Draft Issue 1.3dr Date 8/02/00
Page 4 of 6
Figure 21. The N Series Service Interface Unit. (MU-V4 shown).
11.4. The B Series Subscriber Terminals
The B series Subscriber Terminals are designed for ISDN and use an external antenna
and an internal Modular Service Interface Unit. The STs are powered from the AC
mains supply.
Antenna / RF
IF Drop Cable
Service Interface Unit
Socket PSU
External Components
Internal Components
B1 2B+D ISDN line
Figure 22. B Series Demand Assigned Subscriber Terminals
The ST-B1 supports a basic rate ISDN, 2B+D (2 x 64kbit/s + 16kbit/s) "S" interface,
and operates in Fixed Assigned mode. The Service Interface Unit is a MU-I with a
RJ45 S bus interface.