Specifications

TIM521 BRI Telephony Interface Module

Issue 6 February 2007 307

TIM521 BRI Telephony Interface Module

The TIM521 BRI Telephony Interface Module provides four ports with RJ-45 jacks that can be

administered as BRI trunk connections.

The TIM521 supports up to four BRI interfaces to the central office at the ISDN T reference

point. Information is communicated over each port in two ways:

● Over two 64-kbps channels, called B1 and B2, that can be circuit-switched simultaneously

● Over a 16-kbps channel, called the D-channel, that is used for signaling. The TIM521

occupies one time slot for D-channel use, regardless of whether one, two, three, or four D

channels are in use.

The circuit-switched connections have an A- or Mu-law option for voice operation. The

circuit-switched connections operate as 64-kbps clear channels when in the data mode.

Each port interfaces to the central office at the ISDN T reference point.

Figure 72: The TIM521 Telephony Interface Module

Note:

Note: The TIM521 module does not support BRI stations or combining both B channels

together to form a 128-kbps channel.

Juniper Physical Interface Modules for serial and WAN connectivity

For details about the optional Juniper Physical Interface Modules, see J4350 and J6350

Services Router Getting Started Guide, Release 8.2.

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