Description
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Mini-Carrier Remote
Description, Installation, and Maintenance
Upon LMX detection, the RMI queries the LMX with all known cardLAN
messages so that it can provide this information to the local card that is
emulating that LMX. Upon receiving the last message from the RMI, the
local board begins responding to polls normally. At each local cardLAN
query, the local card responds immediately, and it also sends that query to the
RMI. The RMI then queries the remoting LMX and sends the response back
to the local card. This method keeps the local site one poll behind, but this is
necessary to be able to respond to cardLAN fast enough at the local site over
long T1 distances.
If the RMI detects that a LMX has been removed or changed, it disables or
initializes the appropriate local card’s cardLAN task. Also, if the local card
receives a cardLAN message that is undefined, no attempt is made to answer
that message. Should the existing Nortel line cards be updated such that they
operate on an expanded cardLAN message set, the MCR system must also be
updated.
T1 monitoring
MCR keeps performance statistics for the current hour and for each hour in
the past twenty-four. MCR’s T1 framer chips monitor the performance of the
T1 links. Once a second MCR reads the framer registers and keeps a record
of the following statistics:
•
Errored Second - 1 or more CRC-6 errors or 1 or more out of frame
(OOF) conditions during the second
•
Bursty Second - More than 1 but less than 320 CRC-6 errors during the
second
•
Severely Errored Second (SES) - 320 or more CRC-6 errors or 1 or
more out of frames (OOF) during the second (not displayed)
•
Unavailable Seconds (UAS) - Unavailable state starts with 10
consecutive SES and ends with 10 consecutive non-SES
•
Controlled Frame Slip Seconds - 1 or more frame slips during the
second
•
Loss of Frame Count - Loss of Frame or Loss of Signal for 3
consecutive seconds
