Troubleshooting guide

5-45
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-02
Chapter 5 Troubleshooting Switch Router ATM Interface Connections
Troubleshooting DS3 and E3 Interfaces
T1/E1 Framing
mode:
sts-3c It should match the framing mode
configuration of the destination port.
Check the framing mode configuration on
the destination port.
lcv
1
Indicate the
number of
bipolar violation
(BPV) or
excessive zeros
(EXZ) errors.
The conditions
that cause this
error to
increment will
vary with the line
coding.
Bipolar violation:
AMI—Receiving two successive pulses
of the same polarity.
B3ZS or HDB3—Receiving two
successive pulses of the same polarity, but
these pulses are not part of zero
substitution.
Excessive zeros:
AMI—Receiving more than 15
contiguous zeros.
B3ZS—Receiving more than seven
contiguous zeros.
ferr
2
In SF, the receipt of a terminal frame bit
(Ft) or the signal frame bit (Fs) is
different than expected. In ESF, the
receipt of a framing pattern sequence bit
is different than expected.
bee
3
The bit received in the data pattern is
different from the bit expected, showing
that the value of a bit has changed during
transmission. When a bit error occurs, the
receiving end receives the bit incorrectly.
febe
4
The M-frame uses P bits to check the
line's parity. The M-subframe uses C bits
in a format called C-bit parity, which
copies the result of the P bits at the source
and checks the result at the destination.
An ATM interface reports detected C-bit
parity errors back to the source via a
FEBE.
b1
5
fe
6
plcp_febe
7
hcs
8
Table 5-10 DS3 and E3 Port Adapter show controller Display (continued)
Field
Indication
(Severity) Error and Cause Recommendation