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Configuring ISDN BRI hardware
Installing the clock controller on the MISP (for trunking
applications)
A clock controller is only required for ISDN BRI trunk applications. The system supports a single
active clock controller. This clock controller can support a primary and a secondary reference
clock. These reference clock sources are derived from BRI spans or DSLs (DSL 0 and/or DSL
1).
A clock controller is required in every cabinet or Media Gateway that contains a digital trunk.
The line cards associated with BRI DSLs used as clock references are installed in the Small
System main cabinet or Media Gateway.
Use the following guidelines when installing the clock controller on the MISP:
• If the primary reference clock source comes from a PRI or DTI, then the clock controller
is a daughterboard on the DTI/PRI card.
• If the primary reference clock is derived from a BRI DSL, then the CC daughterboard is
on the MISP associated with that line card. DSL0 of that line card is used to generate the
reference clock.
• To use a DTI/PRI as a secondary clock source reference, the clock controller
daughterboard must reside on a DTI, PRI, or MISP. The clock is extracted from the target
DTI/PRI span and routed to the clock controller over the back plane.
• To use a BRI DSL as a secondary clock source reference, the clock controller
daughterboard must reside on a DTI/PRI or an MISP. The clock is extracted from DSL1
of the source line card and routed over the backplane to the CC.
Installing the SILCs and UILCs
1. Remove the cover from the assigned system.
2. Remove the SILC or UILC from its shipping package and hold it by its card locking
3. Insert the SILC or UILC into the selected card slot and lock it in place.
4. Use the jumper plugs to configure the line powering options for the SILC. Each port
58
ISDN Basic Rate Interface Installation and Commissioning
Important:
Wear the static discharge bracelet located inside the cabinet or Media Gateway
before handling circuit cards. Failure to wear the bracelet can damage the circuit
cards.
devices.
is equipped with its own set of option jumper plugs, enabling individual
configurations for each DSL.
The SILC has three line powering options. These options are configured using the
jumpers located near the backplane connector as shown in
power options
on page 59.
Figure 16: SILC line
March 2011
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