Procedure 11.25: CONVERT RCU SYNCHRONIZATION REFERENCE TO BITS EXTERNAL
5E9(1) and Later
OVERVIEW
This section describes the procedure to convert a Remote Clock Unit (RCU) synchronization reference from T1
source to a Building Integrated Timing Supply (BITS) source. This procedure applies to
5ESS
®
-2000 switch
offices operating on software releases 5E9(1) and later.
This procedure uses the Office Data Base Editor (ODBE) to modify relations in the office data base. The personnel
using this procedure must be familiar with the usage and operation of the ODBE; if unfamiliar with the operation of
ODBE, contact the next level of support. For additional information on the ODBE, see Section
Office Data Base
Editor. The following paragraphs summarize the changes performed by this procedure using the ODBE.
Two relations are modified via ODBE:
RCB_HCB
Which defines the relationship between host and remote DFIs.
SRCREF
Which defines RCU references.
In preparation for this procedure, use ODBE to batch review relation RCB_HCB to the file
"/unixa/users/rcbhcb" and batch review relation SRCREF to the file "/unixa/users/srcref". Exit ODBE and perform
a DUMP:FILE,ALL on these files. The printout of RCB_HCB is used for reference when relation RCB_HCB is
updated. The printout of relation SRCREF is for precautionary measures, in order to recover the relation to the
original values if errors occur during this procedure. These batch file reviews are only done once.
The relation RCB_HCB uses one key attribute (
rpicb
). For each tuple (
rcrefuni
) is changed from SM5REF (1 & 2 ) to
SMNOTREF. Also, for each tuple changed the
rpicb
will be 0. The relation RCB_HCB is not RCU side dependent.
The relation SRCREF uses two key attributes (
rcrefuni
and
side
). The three attributes
fmt_ref
,
dfi_name
, and
ext_ref
, are changed to the following parameter values on both Side 0 and Side 1:
fmt_ref
= D4WZC, D4WOZ, or
D4B8 (value must match the BITS clock output),
dfi_name
= 0, and
ext_ref
= DBYES.
Safe Stop Point
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.
Prerequisite Conversion Conditions
Verify that the BITS reference for the RCU are configured to provide D4 (D4WZC, D4WOZ, or D4B8) signaling at a
stratum 3 level stability or better.
Verify that the new reference cables are properly installed (that is, Tip vs. Ring pairs) but are not connected to the
RCU. Refer to ED5D500-15, Group 80C (for 750A type cable with length of less than 460 feet) or Group 80D (for
606B type cable with length of more than 460 feet).
CAUTION:
Service Effecting
A clock slip may occur after the RCU is first converted to the external reference
and restored to service. Therefore, it is recommended that this procedure be performed during low traffic
periods.
PROCEDURE
235-105-210
October 1999
Copyright © 1999
Page 1
Summary of Contents for 5ESS-2000
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