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Configuring the E1 + G.703 and T1 + DSX-1 Modules
Configuring the E1 + G.703 Module
Yellow Alarm
A yellow alarm indicates that the G.703 interface is receiving signals from a
PBX that is in red alarm. The PBX may not be capable of handling the signal
that the interface is sending to it. If this problem occurs, recheck the config-
uration on the PBX and verify that the cable is good.
Interface Is Accruing Errored Seconds and Clock Slips
If the PBX is not at fault, the problem may be with the synchronization. To
detect synchronization problems, view the G.703 interface status using the
show interfaces command. When you view the status report, you should not
see steadily increasing errors. Clock slips indicate that the hosts on either end
of the line are unable to properly synchronize their signals.
Check the clock source setting on both the E1 interface and the G.703
interface. Each module can have only one clock source. If the E1 interface is
configured to take the clock source from the line, the G.703 interface must
have the clock source setting of through. If, on the other hand, the G.703
interface is configured to take the clock source from the line—the PBX—the
E1 interface should have a clock source setting of through.
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