TIM521 BRI Telephony Interface Module

The TIM521 BRI Telephony Interface Module (Figure 31), also known as the TIM521 BRI media module, has four ports with RJ-45 jacks that can be administered as ISDN Basic Rate Interface (BRI) trunk connections. Each ISDN BRI port has two B-channels plus a D-channel. Up to two TIM521s (with 4 BRI trunk ports each) can be installed in any of the slots on the Services Router.

For ISDN BRI trunking, the TIM521 supports up to four BRI interfaces to the central office at the ISDN T reference point. Information is communicated on each port in two ways:

• Over two 64-Kbps B-channels, called B1 and B2, that can be circuit-switched simultaneously

  Note: The TIM521 does not support BRI stations or combining both B-channels together to form a 128-Kbps channel.

• Over a 16-Kbps channel, called the D-channel, that is used for signaling. The TIM521 occupies one time slot for all four D-channels

The circuit-switched connections have an a-law or mu-law option for voice operation. The circuit-switched connections operate as 64-Kbps clear channels transmitting data.

For pinouts of cable connectors for the TIM521, see TIM521 Connector Pinout.

To install or remove an Avaya VoIP module, see Replacing a PIM.

TIM521 LEDs indicate link status and activity. Table 34 describes the meaning of the LEDs.

Table 34: LEDs for TIM521

For more information about the TIM521, see the Avaya manual Hardware Description and Reference for Avaya Communication Manager.