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3-46
3160-A2-GB21-80
March 1999
The clock source configuration options enable you to select either the network
interface, a synchronous data port, the internal clock, the DTE Drop/Insert
(DSX-1) interface, or an external clock. If external clocking is selected, you must
use the clock rate configuration option to specify the clock rate. Figure 3-12
shows some common clocking configurations. Two sample procedures for
configuring timing are given in the following sections,
Configuring for Network
Timing
and
Configuring for External Timing
. For more information on
configuration options, refer to Appendix C,
Configuration Options
.
NOTE:
The external clock source is only available for 2-port and 4-port DSU/CSUs.
For carrier-mounted DSU/CSUs, the external clock provides timing for up to
eight slots in the carrier. Each Auxiliary Backplane must have its own external
clock input.
496-14341-03
NETWORK
CLOCK: NETWORK CLOCK: NETWORK
CLOCK: NETWORKCLOCK: INTERNAL
CLOCK: EXTERNAL CLOCK: NETWORK
PBX
CLOCK: DTE (G.703) CONNECTOR
CLOCK: NETWORK
TERMINAL
EQUIPMENT
CLOCK: PORT 1, 2, 3, OR 4
CLOCK: NETWORK
Figure 3-12. Common Clocking Configurations