Juniper Networks J2320 manual TIM521 BRI Telephony Interface Module, LEDs for TIM521

J2320, J2350, J4350, and J6350 Services Router Getting Started Guide

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

Label	Color	State	Description
ALM	Red	On steadily	Alarm. A TIM521 failure requires
			monitoring or maintenance.
ACT	Yellow	On steadily	Active. A trunk connected to the
			TIM521 is in use.

76■ Avaya VoIP Modules