Paradyne ACCULINK 316x User Manual download pdf (Page 91)

Operation

3-493160-A2-GB22-10 December 1996

Timing

The 316x 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.

When a master clock source is selected, the DSU/CSU

will synchronize to the master clock and derive clocking

for all of the interfaces on the DSU/CSU. The clock for

each interface will be 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 independent of

the master clock rate. This means that the master clock

rate and the DSU/CSU interface rates may be different.

The DSU/CSU will automatically fall back to the internal

master clock when a failure of the selected master clock is

detected.

NOTE

For Model 3161 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.

The DSU/CSU clock source configuration option

enables you to select one of five sources for the master

clock, either the Network T1 interface, the DSX-1

Drop/Insert T1 interface, Port 1, internal clock, or external

clock. If external clocking is selected, you must use the

clock rate configuration option to specify the clock rate.

Two examples for configuring timing are given below. For

more information on the configuration options, refer to

Appendix C. Figure 3-32 shows some common clocking

configurations.

496-14341a-01

3160/3164

NETWORK

CLOCK: NETWORK

3160/3164

CLOCK: NETWORK

3160/3164

CLOCK: NETWORKCLOCK: INTERNAL

3160/3164

CLOCK: EXTERNAL

3160/3164

CLOCK: NETWORK

PBX

CLOCK: DTE (DSX-1 CONNECTOR)

3160/3164

CLOCK: NETWORK

3160/3164

TERMINAL

EQUIPMENT

CLOCK: PORT 1

3160/3164

CLOCK: NETWORK

3160/3164

Figure 3-32. Common Clocking Configurations

1 2 ... 86 87 88 89 90 91 92 93 94 95 96 ... 210 211

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