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Description
Page 23 of 150
Mini-Carrier Remote
Description, Installation, and Maintenance
If alarms are enabled on the LMI or RMI using the
ALARM ENABLE
(A E)
MMI command (see “
” on page 79), an alarm state
on any Mini-Carrier card connected to the LMI or RMI causes the
normally-closed contact on that card to open and the normally-open contact
on that card to simultaneously close, thus activating the alarm. If alarms are
disabled at the LMI or RMI using the
ALARM DISABLE (A D)
MMI
command (see “
” on page 80), an alarm state will
be indicated by the faceplate LEDs, but the alarm relay will not change states.
Note: The
ALARM DISABLE (A D)
command may be used to return
the dry alarm contacts to their relaxed state during an active alarm so that
the only alarm notification will be the faceplate LEDs, thus allowing
craftspeople time to locate the cause of an active alarm without a constant
siren, horn, or other audible alarm notification.
Self-Test
The self test tests all RAM, read/write locations, ASICS, and it performs a
complete T1 local relay loopback using the onboard test clock. A successful
self test is indicated by the faceplate LEDs’ flashing 3 times. The board will
not go into service until the entire self-test passes.
If the LEDs do not flash 3 times, unseat the card using the faceplate ejector
tabs, breaking the card’s connection with the backplane. Re-insert the card
and lock it in place with the ejector tabs. If the LEDs still do not flash three
times, contact a sales representative about returning the card to Nortel for
repair or replacement.
Time slot assignment and hold
The determining factor for time slot assignment is on-hook/off-hook status.
When MCR detects a telephone going off-hook, it assigns a time slot to that
telephone. For analog cards, off-hook status is used to indicate a need for a
time slot. For digital cards, any speaker-on state is used to indicate a need for
a time slot; MCR assigns a time slot to the telephone if the handset is picked
up or the handsfree mode is activated. ACD sets receive a time slot when they
are logged in or when the headset is plugged in. When all speakers are turned
off and all ACD sets are logged off, MCR determines all time slots to be
available.