Nortel Meridian 1 Option 11C, Администрирование и обслуживание

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Page 268 of 492 Chapter 6 — ISDN BRI trunk implementation
553-3011-311 Standard 7.0 May 1999
Installing the clock controller on the MISP
The line cards associated with BRI DSLs used as references must be installed
in the Main Cabinet.
Clock controller installation guidelines
— If the primary reference clock source is to come from a PRI or DTI, then
the clock controller (CC) must reside as a daughter board on the DTI/PRI
card.
— If the primary reference clock is to be derived from a BRI DSL, then the
CC daughter board must reside on the MISP associated with that line
card, and DSL0 of that line card is used to generate the reference clock.
— If a DTI/PRI is to be used as a secondary clock source reference, the CC
daughter board can reside on either a DTI, PRI or MISP. The clock is
extracted from the target DTI/PRI span and routed to the CC over the
back plane.
— If a BRI DSL is to be used as a secondary clock source reference, the CC
daughter board can reside on either a DTI/PRI or MISP. The clock is
extracted from DSL1 of the source line card and routed over the
backplane to the CC.
Installing the MISPs
The following procedure describes how to install MISPs into the Option 11
main cabinet. Refer to the Card slot allocation plan for the card slots
assigned to MISP.
1 Remove the cover from the main cabinet.
2 Remove the MISP from its shipping package and hold it by its card
locking devices.
Install a clock controller if one is required.
CAUTION
The static discharge bracelet located inside the cabinet must be worn
before handling circuit cards. Failure to wear the bracelet can result in
damage to the circuit cards.