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.
Figure 44: TIM521 BRI Telephony Interface Module
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” on page 243.
To install or remove an Avaya VoIP module, see “Replacing a PIM” on page 174.
TIM521 LEDs indicate link status and activity. Table 41 on page 76 describes the
meaning of the LEDs.
Table 41: LEDs for TIM521
DescriptionStateColorLabel
Alarm. A TIM521 failure requires
monitoring or maintenance.
On steadilyRed
ALM
Active. A trunk connected to the
TIM521 is in use.
On steadilyYellow
ACT
76 ■ Avaya VoIP Modules
J2320, J2350, J4350, and J6350 Services Router Getting Started Guide
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