Nortel DMS-100 Series Maintenance Manual page 22

2-2 Star Remote System hardware
When one of the two units of the Star Hub goes out of service, the in-service
unit takes full control of the other unit's line subgroups in addition to its own
line subgroups. In addition, the in-service unit has access to the C-side links
used by the out-of-service mate unit. This activity is called a mate takeover.
The following figure shows the basic architecture of the Star Remote System.
Figure 2-1 Star Remote System architecture
Star Remote
System
POTS/MBS/1MM
lines
ISDN lines
297-8353-550 Standard 05.01 March 2001
Network
LTC+, LGC+,
or RCC2
2 to 16
DS-1 links
Unit 0
Star Hub
Processor 0
Line
subgroup 00
Line
card 0
ISDN lines
Star
Module
Up to 64 subscriber
lines for each
remote line drawer
DS30 or
DS512 link
Unit 1
Processor 1
Line
subgroup 01
Line
card 0
POTS/MBS/1MM lines
1 or 2 DS-1s for each Module
Star
Module
Host office
Remote site
Up to 1152
subscriber lines
POTS/MBS/1MM
lines
ISDN lines