SolutionPossible ProblemInput Error Type(Field Name)
1
Ensure that all devices are
properly configured to use a
common line clock. Set SCTE
on the local and remote DSU.
2
Shield the cable, if necessary.
Make certain that the cable is
within the recommended length
(no more than 50 feet [15.24
meters], or 25 feet [7.62
meters] for a T1 link). Ensure
that all connections are good.
3
Check the hardware at both
ends of the link. Swap faulty
equipment, as necessary.
4
Lower data rates and determine
whether aborts decrease.
5
Use local and remote loopback
tests to determine where aborts
are occurring.
6
Contact your leased-line or
other carrier service, and have
it perform integrity tests on the
line.
Aborts indicate an illegal sequence
of 1 bit (more than seven in a row).
The following are possible reasons
for this to occur:
•
SCTE mode is not enabled
on the DSU.
•
The CSU line clock is
incorrectly configured.
•
The serial cable is too long,
or the cable from the CSU or
DSU to the router is not
shielded.
•
A ones density problem has
occurred on the T1 link
(incorrect framing or coding
specification).
•
A packet was terminated in
the middle of transmission
(typical cause is an interface
reset or a framing error or a
buffer overrun).
•
A hardware problem has
occurred (bad circuit, bad
CSU/DSU, or bad sending
interface on remote router).
Aborted transmission (abort)
Serial Lines: Increasing Interface Resets on Serial Link
Interface resets that appear in the output of the show interfaces serial EXEC command are the result of missed
keepalive packets.
Symptom: Increasing interface resets on serial link
The following table outlines the possible problems that might cause this symptom and describes solutions to
those problems.
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS
XE Everest 16.5
336 OL-14127-17
Troubleshooting the Serial SPAs
Serial Lines: Increasing Interface Resets on Serial Link
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