Specifications

Common Equipment Description 2-25
SRM-3T3
SRM-T1E1 LED Indicators
All LEDs are located on the faceplate of the front card. The SRM-T1E1 LED indicators are
described in Table2-4.
Table2-4 SRM-T1E1 LED Indicators
SRM-3T3
The SRM-3T3 includes three T3 ports on a backcard. Each of these ports can be used to support up
to 28 multiplexed T1 lines which are distributed to T1 service module ports in the shelf. This feature
is called bulk distribution and is performed when the SRM is in “bulk mode”. The purpose of this
feature is to allow large numbers of T1 lines to be supported over three T3 lines rather than over
individual T1 lines.
Out of the maximum possible 84 T1 channels (3 times 28), up to 80 channels can be active at any
time. Any T1 channel in a T3 line can be distributed to any four/eight port on a service module in
any slots 5 to 14 without restriction.
The SRM-3T3 can also be operated in “non-bulk mode” on a port-by-port basis. For a port
configured in non-bulk mode, bulk distribution is disabled and the SRM acts as a SRM-T1E1
providing BERT and 1 for N redundancy functions only.
When operating in bulk mode, individual T1 lines can be used on service module ports. However, a
service module port cannot be used simultaneously with an individual T1 line and with a distributed
T1 channel. An illustration of the SRM-3T3 card is shown in Figure2-18.
Type of LED Color Meaning
ACTIVE (ACT) LED Green On indicates the card set is in active mode.
STANDBY (STBY) LED Yellow On indicates the card set is in standby mode.
FAIL (FAIL) LED Red On indicates the BNM-155 card set has failed or the line module
is missing.
LINE REDUNDANCY
(1:N RED) LED
Green On indicates 1:N redundancy has been invoked.
Off indicates 1:N redundancy is not active.
BERT (BERT) LED Green
On indicates the BERT function is active.