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Chapter 1 Introduction to the Business Communications Manager Platform Hardware 77
Installation and Maintenance Guide
Figure 41 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 lines to the Business Communications Manager system. European systems use an S
interface. North American-based systems use a T interface with an external NTI line.
Each BRI ISDN line you connect adds two telephone lines to the Business Communications
Manager system. Therefore, each ISDN 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. The LEDs
beside each RJ-48C jack are on when the ISDN line is active. Figure 42 shows the BRI faceplate
LEDs and connections.
Figure 42 ISDN BRI media bay module 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
CTM 4
1Aux 2 3 4
CTM 8
1Aux 2 3 4
87 6Aux5
Front View
Front view
Power LED
Status LED
Line 1
Line 2
Line 3
Line 4
ISDN BRI
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