HP 3162 manual Selecting the Timing Source, Common Clocking Configurations

Configuration

Selecting the Timing Source

The DSU/CSU provides the ability to select a master clock (timing) source that is used to synchronize all of the T1 and data port interfaces on the DSU/CSU. The clock for each interface is at the appropriate rate for that interface (e.g.,

1.544 Mbps for the T1 interfaces, the configured port rate for the data ports), and it is independent of the master clock rate. This means that the master clock rate and the DSU/CSU interface rates may be different.

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 4-11 shows some common clocking configurations. For more information on configuration options, refer to Appendix C.

NETWORK

CLOCK: NETWORK CLOCK: NETWORK

CLOCK: INTERNAL CLOCK: NETWORK

CLOCK: EXTERNAL CLOCK: NETWORK

PBX

CLOCK: DTE DROP/INSERT (DSX-1) CONNECTOR CLOCK: NETWORK

TERMINAL

EQUIPMENT

CLOCK: PORT 1 CLOCK: NETWORK

496-15012-01

Figure 4-11. Common Clocking Configurations

4-20 August 2000 3162-A2-GB20-40