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76 Chapter 2 Telephony hardware
P0993298 02
Figure 19 CTM and CTM8 LEDs and jacks
Basic Rate Interface media bay module
The Basic Rate Interface media bay module (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 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 20 shows a front view of the BRI.
The LEDs beside each RJ-48C jack are on when the ISDN line is active.
Figure 20 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