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Chapter 2 Telephony hardware 41
Installation and Maintenance Guide
Figure 17 CTM and CTM8 LEDs and jacks
Basic Rate Interface media bay module
The Basic Rate Interface media bay module (ISDN BRI) module connects a maximum of four BRI
ISDN loops (eight lines) to the Business Communications Manager system.
European systems use straight connects to ISDN devices (S interface) or to ISDN trunks from a
service provider (T interface). North American-based systems require an external NTI module
between the service provider trunk (T-interface) or between the BRI module and the ISDN devices
(S interface).
Each BRI ISDN line you connect adds two telephone lines to the Business Communications
Manager system. Therefore, each BRI adds a maximum of eight telephone lines to the Business
Communications Manager system via the four RJ48C jacks on the faceplate. You can also use this
module for dial backup or dial-on-demand services for WAN connections.
Figure 18 shows a front view of the BRI.
The LEDs beside each RJ-48C jack are on when the ISDN line is active.
Figure 18 BRI LEDs and jacks
CTM
Power LED
Status LED
Line 1
Aux
Line 2
Line 3
Line 4
CTM8
Line 1
Auxiliary port
Auxiliary port
Line 5
Front view
Power LED
Status LED
Line 1
Line 2
Line 3
Line 4