5.11 Integrate Vendor Stratum 3 Bits Timing Source
OVERVIEW
This procedure performs the following three major activities:
• Verifies that the timing references are connected for the vendor BITS (Building
Integrated Timing Supply) clock (referred to later in this procedure as the "BITS
box"), with Stratum 3 capability.
• Installs error detection scan points.
• Upgrades the TSICOM circuit pack with UM74D.
For offices configured with an EXM-2000 (Extended Switch Module-2000) refer to
235-105-210, 5ESS
®
Switch Routine Operations and Maintenance Procedures.
• Procedure must be performed at the DRM office.
PROCEDURE
5.11.1 Safe Stop Point
1. Safe Stop Points are provided in the procedure set where progress in the
performance of a procedure may be suspended temporarily without causing
degradation in the operation of the equipment. Execution of the procedure can be
halted at one of these points only if all prior steps within the procedure have
been successfully completed.
5.11.2 Prerequisite Conversion Conditions
1. The following prerequisites must be satisfied before performing this procedure.
• The vendor supplied BITS clock:
HP55400A
1
or Telecom Solutions
2
DCD-523 is installed and operational and is
supplying a reference signal for the existing switching module.
Note: This procedure is based on the use of a Telecom Solutions BITS clock
being in place.
• The following cables must be connected (see Figure 5.11-1):
a. Input clock reference cables (2).
b. Output clock reference cables (2) to TSIU4/TSIU4-2.
c. Scan points wired to the Main Distribution Frame (MDF) for the BITS
box.
d. Scan point alarm cable (1) from the MDF to the Modular Metallic Service
Unit (MMSU).
• Two UM74D circuit packs must be available.
• The user must be familiar with Electrostatic Discharge (ESD) protection
requirements.
1. HP55400A is a trademark of Hewlett Packard Inc. in the United States and other countries.
2. Telecom Solutions is a registered trademark of Symmetric Com, Inc. in the United States and other
countries.
235-200-150
January 2003
ROUTINE MAINTENANCE
Procedure 5.11
Issue 3.00 Page 5.11-1
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