Solution
Possible Problem
Status Line Condition
1
Check the CD LEDs to see
whether the CD is active, or
insert a breakout box on the
line to check for the CD signal.
2
Verify that you are using the
proper cable (see your
hardware installation
documentation).
3
Insert a breakout box and check
all control leads.
4
Contact your leased-line or
other carrier service to see
whether there is a problem.
5
Swap faulty parts.
6
If you suspect faulty router
hardware, change the serial line
to another port. If the
connection comes up, the
previously connected interface
has a problem.
The router is not sensing a carrier
detect (CD) signal (that is, the CD
is not active).
The line is down or is not
connected on the far end.
Cabling is faulty or incorrect.
Hardware failure has occurred in
the channel service unit/data
service unit (CSU/DSU).
Serial x is down, line protocol is
down
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS
XE Everest 16.5
326
OL-14127-17
Troubleshooting the Serial SPAs
Serial Lines: show interfaces serial Status Line Conditions