Paradyne 8779, U8777 manual Table A-8. System Clock Options

A. Configuration Options

Table A-8. System Clock Options

Primary System Clock Reference

Possible Settings (LTU, Model 8777): DSX-1 Port 1, DSX-1 Port 2, DSX-1 Port 3,

DSX-1 Port 4, DSX-1 Port 5, DSX-1 Port 6, DSX-1 Port 7, DSX-1 Port 8, Internal

Default Setting: Internal

Possible Settings (LTU, Model 8779): G.703 Port 1, G.703 Port 2,G.703 Port 3,

G.703 Port 4, G.703 Port 5, G.703 Port 6, G.703 Port 7, G.703 Port 8, Internal

Default Setting: Internal

Possible Settings (NTU): DSL Port 1, DSL Port 2, DSL Port 3, DSL Port 4, DSL Port 5,

DSL Port 6, DSL Port 7, DSL Port 8 Default Setting: DSL Port 1

Determines the source of system timing. Select the most accurate clock available.

DSX-1 Port n (Model 8777) – Timing is derived from the specified port. To be a valid clock source, the port must be enabled and must derive its timing from the DSX-1 network.

NOTE: If the DSX-1 port is configured for Bypass mode, the Primary Clock Source configuration option on the DSX-1 Interface Options screen must be set to DSX-1, not Internal (see Table A-4). All ports configured as system clock sources must be traceable to the same clock reference.

G.703 Port n (Model 8779) – Timing is derived from the specified port. To be a valid clock source, the port must be enabled and must derive its timing from the G.703 network.

NOTE: If the G.703 port is configured for Bypass mode, the Primary Clock Source configuration option on the G.703 Interface Options screen must be set to G.703, not Internal (see Table A-5). All ports configured as system clock sources must be traceable to the same clock reference.

DSL Port n – Timing is derived from the specified port. The port must be enabled and in a cross-connection.

Internal – Timing is derived from the internal oscillator, which provides a Stratum 4 reference.

Secondary System Clock Reference

Possible Settings (LTU, Model 8777): DSX-1 Port 1, DSX-1 Port 2, DSX-1 Port 3,

DSX-1 Port 4, DSX-1 Port 5, DSX-1 Port 6, DSX-1 Port 7, DSX-1 Port 8, Internal

Default Setting: Internal

Possible Settings (LTU, Model 8779): G.703 Port 1, G.703 Port 2, G.703 Port 3,

G.703 Port 4, G.703 Port 5, G.703 Port 6, G.703 Port 7, G.703 Port 8, Internal

Default Setting: Internal

Possible Settings (NTU): DSL Port 1, DSL Port 2, DSL Port 3, DSL Port 4, DSL Port 5,

DSL Port 6, DSL Port 7, DSL Port 8 Default Setting: DSL Port 1

Determines the source of system timing if the primary system clock source fails. If the secondary clock source fails, the unit switches to the internal clock.

DSX-1or G.703 Port n – Timing is derived from the specified port. To be a valid clock source, the port must be enabled and must derive its timing from the DSX-1 or G.703 network.

DSL Port n – Timing is derived from the specified port. The port must be enabled.

Internal – Timing is derived from the internal oscillator, which provides a Stratum 4 reference.

A-18 May 2002 8700-A2-GB20-40