Cisco ASR 1000 Configuration Manual page 336

Performing Basic Interface Troubleshooting
Table 20-5
Input Error Type
(Field Name)
Framing errors
(frame)
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
20-12
Serial Lines: Troubleshooting Serial Line Input Errors (continued)
Possible Problem
A framing error occurs when a
packet does not end on an 8-bit
byte boundary for one of the
following reasons:
The serial line is noisy.
•
The cable is improperly
•
designed, the serial cable is
too long, or the cable from
the CSU or DSU to the
router is not shielded.
• SCTE mode is not enabled
on the DSU, the CSU line
clock is incorrectly
configured, or one of the
clocks is configured for
local clocking.
A ones density problem has
•
occurred on the T1 link
(incorrect framing or coding
specification).
Chapter 20 Troubleshooting the Serial SPAs
Solution
Ensure that the line is clean enough for
1.
transmission requirements. Shield the
cable, if necessary. Make certain that you
are using the correct cable.
Make sure that the cable is within the
2.
recommended length (no more than 50 feet
[15.24 meters], or 25 feet [7.62 meters] for
a T1 link).
Ensure that all devices are properly
3.
configured to use a common line clock. Set
SCTE on the local and remote DSU.
4. Make certain that the local and remote
CSU/DSU are configured for the same
framing and coding scheme as that used by
the leased-line or other carrier service (for
example, ESF/B8ZS).
Contact your leased-line or other carrier
5.
service, and have it perform integrity tests
on the line.
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