Paradyne 8777 Benutzerhandbuch

Configuration Options

A-13

8700-A2-GB20-00

April 2000

System Clock

The Primary and Secondary System Clock References determine the clock used
by ports in a cross-connect configuration. For System Clock configuration
options, refer to

Table A-8

. To access the System Clock screen, follow this menu

selection sequence:

Main Menu

→

Configuration

→

Load Configuration From

→

System Clock

ÎÎ

main/config/system_clock

Slot: 18

Model: 87xx

SYSTEM CLOCK

Primary System Clock Reference

Internal

Secondary System Clock Reference

Internal

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Ctrl-a to access these functions, ESC for previous menu

MainMenu

Exit

Save

All ports configured as system clock sources must be traceable to the same clock
reference. Ports in a cross-connect configuration that are not providing timing
themselves receive their timing from the system clock reference. All ports in a
cross-connect configuration are therefore synchronized to the system clock
reference.

The following table shows the system clock reference combinations permitted for
LTUs and NTUs. Choose the most accurate clock available for the Primary
System Clock Reference.

Device

If the Primary System Clock
Reference is . . .

The Secondary System Clock
Reference must be . . .

LTU

DSX-1 or G.703 port in
cross-connect mode

DSX-1 or G.703 port in DS1 Bypass
mode, or

Internal

DSX-1 or G.703 port in DS1
Bypass mode

DSX-1 or G.703 port in DS1 Bypass
mode, or

Internal

NTU

DSL port in cross-connect mode

Internal