Nortel Communication Server 1000 Fundamentals page 26

26 Description
Man-Machine Interface
See
MMI commands, and
115)
Daisy chaining
LMIs may be daisy-chained together to share a single maintenance
terminal and a single SDI port. Each LMI has a DIP switch-configurable
daisy-chain address. LMX and RMI status can be determined by logging
into their associated LMI.
SDI functionality
The LMI may be connected to an SDI port on the switch, providing
a "host pass-through" capability at both local and remote sites. This
allows craftspeople at the remote site to have access to the system TTY
connection, and provides a single MMI/SDI terminal at the local site.
Alarms
An alarm condition is indicated by the appropriate LMI and RMI faceplate
LEDs. The cards are also equipped with a single dry alarm contact output
to indicate alarm status. A normally-closed and a normally-open dry alarm
contact point are both provided. These contacts may be connected to
customer-provided alarm-sensing equipment, if desired.
If alarms are enabled on the LMI or RMI using the ALARM ENABLE (A
E) MMI command (see
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
will be indicated by the faceplate LEDs, but the alarm relay will not change
states.
Note:
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 checks all RAM, read/write locations, ASICS, and performs
a complete T1 local relay loopback using the onboard test clock. A
successful self-test is indicated by the faceplate LEDs flashing three times.
The board will not go into service until the entire self-test passes.
"Installation and configuration" (page 47)
"Man-Machine Interface (MMI) commands" (page
for a listing and brief discussion of each command.
"ALARM ENABLE (A E)" (page
"ALARM DISABLE (A D)" (page
The ALARM DISABLE (A D) command may be used to return
Nortel Communication Server 1000
Mini-Carrier Remote Fundamentals
NN43001-557 04.01 4 June 2010
Copyright © 2003-2010 Nortel Networks. All Rights Reserved.
for a detailed explanation of
74)), an alarm
74)), an alarm state