External alarm connections – Nortel Networks 1000 User Manual
Page 205
Installation and configuration
205
facilities. If the Lineside T1 card is connected through T1 carrier facilities,
the transmit and receive pairs must be wired straight through to the RJ48
at the Telco demarc, the CSU, or other T1 carrier equipment. The T1 CPE
equipment at the far end has transmit and receive wired straight from the
RJ48 demarc at the far end of the carrier facility.
T1 signaling for all 24 channels is transmitted over P2 connector pins 1, 3,
9, and 11 as shown in
Table 86 "Lineside T1 card - NT5D13AA Connector
. Plug the DB15 male connector labeled "P2" into the
T1 link. T1 transmit and receive pairs must be turned over between the
Lineside T1 card and CPE equipment that is hardwired without carrier
facilities. If the Lineside T1 card is connected through T1 carrier facilities,
the transmit and receive pairs must be wired straight through to the RJ48
at the Telco demarc, the CSU, or other T1 carrier equipment. The T1 CPE
equipment at the far end has transmit and receive wired straight from the
RJ48 demarc at the far end of the carrier facility.
External alarm connections
P3 connector pins 3, 4, and 28 can be plugged into any external alarm
hardware. Plug the male DB9 connector labeled "P3" into the external
alarm. These connections are optional, and the functionality of the
Lineside T1 card is not affected if they are not made.
The MMI (described in detail in
“Functional description” (page 385)
)
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
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.
P3 connector pins 3, 4, and 28 can be plugged into any external alarm
hardware. Plug the male DB9 connector labeled "P3" into the external
alarm. These connections are optional, and the functionality of the
Lineside T1 card is not affected if they are not made.
The MMI (described in detail in
“Functional description” (page 385)
)
monitors the T1 link for specified performance criteria and reports on
problems detected.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.