Nortel Networks 311 MMI connections

Installation and conﬁguration 215

The MMI (described in detail in "Functional description" (page 391))

monitors the T1 link for speciﬁed performance criteria and reports on

problems detected.

One of the ways it can report information is through this external alarm

connection. If connected, the Lineside T1 card’s microprocessor activates

the external alarm hardware if it detects certain T1 link problems that it has

classiﬁed as alarm levels 1 or 2. See "Functional description" (page 391) for

a detailed description of alarm levels and conﬁguration. If an alarm level

1 or 2 is detected by MMI, the Lineside T1 card closes the contact that is

normally open, and opens the contact that is normally closed. The MMI

command Clear Alarm returns the alarm contacts to their normal state.

MMI connections

P5 connector pins 2, 3, 5, 7 and 9 are used to connect the Lineside T1

card to the MMI terminal and daisy chain Lineside T1 cards together for

access to a shared MMI terminal. When logging into a Lineside T1 card,

"control 2" is asserted by that card, which informs all of the other cards not

to talk on the bus, but rather to pass the data straightthrough. The pins

labeled "control 1" are reserved for future use. As with the external alarm

connections, MMI connections are optional. Up to 128 Lineside T1 cards,

located in up to 16 separate IPE shelves, can be linkedto one MMI ter minal

using the daisy chaining approach.

If only one Lineside T1 card is being installed, cable from the DB9 female

connector labeled "P5" (towards MMI terminal) to one of the COM ports

on the back of any TTY,a PC running a terminal emulation program, or a

modem. For installations of only one card, no connection is made to the

DB9 male connector labeled "P4" (away from MMI terminal).

If two or more Lineside T1 cards are being installed into the system, the

MMI port connections can be daisy-chained together so that only one

MMI terminal is required for up to 128 Lineside T1 cards. See Figure 38

"Lineside T1 card - connecting two or more cards to the MMI" (page 218).

Cards can be located in up to 16 separate IPE shelves. Any card slot in the

IPE shelf can be connected to any other card slot; the card slots connected

together do not need to be consecutive.

Follow this procedure for connecting two or more Lineside T1 cards to the

MMI terminal:

Step Action

1Cable the DB9 male connector labeled "P5" (towardsMMI terminal)

to one of the COM ports on the back of any TTY,a PC running a

terminal emulation program, or a modem.

2Make the connection from the ﬁrst card to the second card by

plugging the DB9 female connector labeled "P4" (away from MMI

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 01.04 Standard

Release 5.0 23May 2008