Owner's manual

966 NTRB21 DTI/PRI/DCH TMDI card

The NTRB21 TMDI card provides 1.5 MBits Digital Trunk Interface or

Primary Rate Interface functionality on the Option 11C. The NTRB21 has

a built-in downloadable D-channel, and may occupy card slots 1-9 on the

Option 11C main cabinet.

Figure 280

NTRB21 TMDI card faceplate

Note 1: For CISPR B group cabinets, the active Clock Controller

(NTAK20) can only occupy slots 1-3. For FCC and/or CISPR A group

cabinets, this limitation does not exist - the Clock Controller can occupy

any available slot 1-9.

Note 2: The NTRB21 TMDI card requires that the Option 11C be

loaded with at least Release 24 software. If an Option 11C switch

is loaded with Release 24 (or later) software, the NTRB21 can be

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 02.06 Standard

27 August 2008