Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Table 8-1 - continued. CM4 Diagnostic Counters
Counter Name (NMS or SCL) Update Rate / Method Severity Effect on System Function & Notes
Currently Received Losses of Frame
NM
S: Curr Loss of Frame Cnt
SCL:
CRLOS
Current counter contains
result for previous 1s interval.
During each second CM4
checks presence of
fr
aming
sync every 2ms - if sync is
lost, the counter will increase
by one.
Major When Loss of Frame
condition exists, pa
yload
traffic is corrupted.
Disturbance may spread to
other nodes.
Counter reports Loss of Frame
at the Comm
on Module. Loss
of Frame occurs when the
multiplexer cannot capture the
timing structure of the received
signal. Typically, this denotes
bad T1 signal at the
multiplexer port, high bit error
rate, improper single-
frame/multi-frame
configuration or improper
timing configuration. During
Loss of Frame condition, the
content of other counters may
be not valid. When Fast
Reframe is On, and Loss of
Frame is the only alarm active,
it is most likely due to
incorrect Fast Enable/Disable
configuration in the network.
Currently Received Line Code
Violations
NMS: Curr
Line Code Violation
Cnt
SCL:
CBPV
Current counter contains
result for previous 1s interval.
Minor Low level of Line Code
Violations has a
mi
nimal
effect on system if not
accompanied by other
trouble conditions.
Counter reports Line Code
Violations received at the
Com
mon Module. Line Code
Violations are pulses of
incorrect polarity in the
received signal. Typically, this
denotes errors or noise present
in the T1 signal at the
multiplexer port or improper
AMI/B8ZS line code
configuration.
Currently Received Path Code
Violations
NMS: Curr
Path Code Violation
Cnt
SCL:
CBERS
Current counter contains
result for previous 1s interval.
Intermediate Low level of Path Code
Violations has a mi
nimal
effect on system if not
accompanied by other
trouble conditions.
Counter reports Path Code
Violations received at the
Com
mon Module. Path Code
Violations are bit errors in
received signal. In ESF
framing mode this equals to the
CRC6-error count. In SF mode,
it is the framing bit error count.
Typically, this denotes errors
or noise in the T1 signal at the
multiplexer port or improper
SF/ESF line format
configuration.
Currently Received Frame Bit Error
NMS: Curr Frame Bit Error Cnt
SCL:
CMFOS
Current counter contains
result for previous 1s interval.
Intermediate When Frame Bit Error
condition exists,
pa
yload
traffic may be corrupted.
Disturbance may spread to
other nodes.
Reports Frame Bit Error at the
Comm
on Module. Frame Bit
Error is defined as errors in the
framing pattern. Typically, this
denotes bit errors or bad T1
signal at the multiplexer port,
improper SF/ESF line format
setting or improper network
timing configuration.
Currently Received E-Bit Errors
(E1 only)
NM
S: Curr Ebit Cnt
SCL:
CEBIT
Current counter contains
result for previous 1s interval.
Intermediate Payload traffic has been
corrupted. Severit
y needs
to be checked at re
ceiver
node.
E-Bit errors are returned to the
repor
ting CM when it has
transmitted frames which fail
CRC check. This denotes bit
errors on the transmit side.
M-DACS-T1 RFL Electronics Inc.
October 25, 2004 8-12 (973) 334-3100
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