E1 connections, External alarm connections, Mmi connections – Nortel Networks 1000 User Manual
Page 277
Installation
277
E1 Connections
For twisted-pair installations, E1 signaling for all 30 channels is transmitted
over P2 connector pins 1, 3, 9, and 11, as shown in
lineside E1 I/O cable pinouts" (page 276)
Plug the DB 15 male connector labeled "P2" into the E1 link. E1 transmit
and receive pairs must be turned over between the LEI and the CPE
that is hardwired without carrier facilities. If the LEI is connected through
E1 carrier facilities, the transmit and receive pairs must be wired straight
through to the RJ48 at the Telco demarc, the LTU, or other E1 carrier
equipment. The E1 CPE at the far-end has transmit and receive wired
straight from the RJ48 demarc at the far-end of the carrier facility.
For 75 ohm coaxial installations, E1 signaling for all 30 channels is
transmitted over P2 connector pins 1, 3, 9, and 11 though an adapter
and out two coaxial connectors Tx (transmit) and Rx (receive). Tx is the
LEI output, and Rx is the LEI input from the E1 stream. E1 transmit and
receive pairs must be turned over between the LEI and the CPE that is
hardwired without carrier facilities. If the LEI is connected through E1
carrier facilities, the transmit and receive pairs must be wired straight
through to the RJ48 at the Telco demarc, the LTU, or other E1 carrier
equipment. The E1 CPE at the far end has Tx and Rx wired straight from
the RJ48 demarc at the far end of the carrier facility.
External Alarm Connections
P3 connector pins 1, 2 and 3 can be plugged into any external
alarm-sensing hardware. Plug the DB9 male connector labeled "P3"
into an external alarm. These connections are optional, and the LEI
functionality is not affected if they are not made.
The MMI monitors the E1 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 LEI’s microprocessor
activates the external alarm hardware if it detects certain E1 link problems
it has classified as alarm levels 1 or 2. See
interface software” (page 284)
for a detailed description of alarm levels
and configuration. If an alarm level 1 or 2 is detected by the MMI, the
LEI 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 LEI to the MMI
terminal, connecting LEIs in a daisy chain for access to a shared MMI
terminal. When logging into a LEI, "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 straight through. The pins labeled "control 1" are reserved
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.