Procedure 11.38: PERFORM ORM ETR CONNECTION
5E9(1) AND LATER
OVERVIEW
This procedure provides the necessary steps to connect an External Timing Source (ETS) via an External Timing
Reference (ETR) from the Dual Link Interface (DLI) of an Optical Remote Switching Module (ORM). One such
appropriate external timing source which can be connected via the ETR would be the Building Integrated Timing
Supply (BITS) Clock. Note, however, that the existence of an external timing source via an ETR is
mandatory
if the
ORM has digital terminations and is
recommended
if the ORM has the stand-alone option. When the ORM obtains
timing from an external timing source via the ETRs, timing from the umbilicals will not be used.
This procedure makes reference to two different types of switching module processor types, Module Controller and
Time Slot Interchange Unit (MCTU) and model 2 of the same (MCTU2). All steps listing MCTU pertain to either
MCTU or MCTU2.
Prerequisite Conditions
(1)
The accuracy of the ETS should be of Stratum 3 level or higher.
(2)
The ORM ETR may be used in conjunction with auto power recovery (APR) in 5E10 and later software
releases. Verify all required hardware, as listed in the following documents, is available.
With APR:
J-5D003LA-1; ED5D503-32 group 380
Without APR:
J-5D003LA-1; ED5D503-32 group 381
NOTE:
The DLI must have a pack code of TN1077F or greater release.
(3)
This procedure should be exercised during low periods of traffic.
(4)
ElectroStatic Discharge (ESD) protection requirements must be followed.
(5)
If the ORM will be connected to a BITS clock, each DLI side must
NOT
share the same Timing Output DS1
Automatic card (TOTA) of the BITS clock. Per DLI, it is mandatory the T1 interface port of a single DLI is
connected to a dedicated TOTA.
PROCEDURE
1.
Perform ORM ETR Connection
5E9(1) AND Later
11.38.1 Verify and Set Initial Conditions
1.
At the Master Control Center (MCC), verify normal conditions in the Switching Module (SM) to determine if
system status is acceptable to start the connection procedure.
If a NORMAL indication is not obtained, type and enter:
OP:SYSSTAT
Correct any deficiencies as required.
11.38.2 Record Communication Link (CLNK) Mapping Data
235-105-210
October 1999
Copyright © 1999
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