Specifications
Known issues with
firmware v4.7 fdr 35
74
6.19. EM316T1E1-XY issues
6.19.1. Issues when CPE is looping back
(BZ#: 6872,6948,7684)
Description: When loopback is used on the CPE board (generally used for testing links), all
configuration commands are ignored. There is no feedback about it in the CLI.
When "restart cold" is used on LNXNM while loopback is used on CPE, normal behavior is that loopback
is turned off, as "restart cold" is equivalent to a power-cycle. But in this case loopback is NOT turned off,
as all configurations on the CPE are ignored including the "no loopback" command.
While in loopback, CPE transfers the data stream intact as received from CO, which means "Last Gasp"
trap will not be sent, when CPE loses power.
If remote trunk loopback is enabled, user should refrain from making any configuration changes to the
remote slot/ports, other than to clear the remote trunk loopback. If they do, mismatches between admin/
oper values will result.
Suggested Work-Around: Do not configure parameters while using loopback. Loopback is
generally used for testing links for a short time.
Customer Impact: Minimal. Informational only.
Corrective Action: This issue will be addressed in future software upgrades.
6.19.2. Behavior details when BPV injected
(BZ#: 7208,7217)
Description: When BPV (bi-polar violation) or CV (code violation) is injected into the module
depending on the module mode you will see link change traps.
Link parameter has 3 values: 1) Link (implies SD OK and no CV), 2) Signal Detect (implies SD is OK
but there are CV), 3) No Signal (implies no SD). If the Link value changes, a trap is given with the new
value. For example, if Link value was Link, and then BPV are inserted, the Link status will change to
Signal Detect and a trap will be sent.
The LOS LED indication is the logical OR of Signal Detect and CV (BPV or Excessive Zeros), so if there
is loss of SD or if there is CV, the LED turns amber.
In the case of T1 B8ZS, when BPV are inserted, the Link changes its value from Link to Signal Detect.
When BPV Errors are removed, it changes back to Link. In the case of T1 AMI, the value is always Signal
Detect because with AMI there is always excessive zeros which are considered as CV and that is why
it's only Signal Detect.
Suggested Work-Around: None.
Customer Impact: Minor inconvenience.
Corrective Action: No change to design. This feature works as designed.