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CHAPTER 10
Troubleshooting
10-4
The following figures show a representative module for each of the three
variations:
• SRP module (Figure 10-1)
Ethernet line
modules
LINK Ethernet Green Ethernet link up Ethernet link down
ACTIVITY Ethernet Green Blinks when Ethernet
traffic on link
No Ethernet traffic
on link
HSSI line
module
SYNC Port status Green If the port is configured
as DTE, the LED lights
when both the DCE and
the clock source are
available.
If the port is configured
as DCE, the LED lights
when the DTE is
available.
If the port is configured
as DTE, the LED goes
out when either the DCE
or the clock source
becomes unavailable.
If the port is configured
as DCE, the LED goes
out when the DTE
becomes unavailable.
YEL ALM Note: This LED is not functional on the HSSI line module.
RED ALM Port status Red If the port is configured
as DTE, the LED lights
when either the DCE or
the clock source
becomes unavailable.
If the port is configured
as DCE, the LED lights
when the DTE becomes
unavailable.
If the port is configured
as DTE, the LE goes out
when both the DCE and
the clock source are
available.
If the port is configured
as DCE, the LED goes
out when the DTE is
available.
X.21/V.35 line
module
ACTIVE Port status Green Port configured Port not configured
LOOPBK Port status Yellow Port in local loopback or
remote loopback,
depending on the type of
connection. (See)
Port not in loopback
ERROR Port status Red Port is enabled or comes
online
Port is disabled or goes
offline
V.35 Port status Green V.35 cable connected V.35 cable disconnected
X.21 Port status Green X.21 cable connected X.21 cable disconnected
DCE Port status Green DCE cable connected DCE cable disconnected
DTE Port status Green DTE cable connected DTE cable disconnected
Other line
modules
SYNC Port status Green In frame Not in frame
YEL ALM Port status Yellow Far end receive failure
(FERF) exists
No FERF present
RED ALM Port status Red Loss of sync/frame In frame
Table 10-2 LED identification and activity descriptions (continued)
LED Location LED Label LED Indicator LED Color OFF to ON ON to OFF