Multimedia Taps 2-Way and 4-Way
Revisions A through G When Used
with the Power Distribution Unit
(SGPDU2/4) Technical Bulletin
Overview
Purpose
The purpose of this document is to provide installation instructions for adding a
pair of ground brackets to 2-way and 4-way Multimedia Taps (Revisions A
through G) that may be used in conjunction with a Power Distribution Unit
(PDU).
Who Should Use This Document
This document is intended for customers using a Cisco PDU with standard profile
2-way and 4-way Multimedia Taps. There is no grounding issue with any version
of the 8-way Multimedia Taps.
Qualified Personnel
Only appropriately qualified and skilled service personnel should attempt to
install, operate, maintain, and service this product.
WARNING:
Allow only qualified and skilled personnel to install, operate, maintain, and
service this product. Otherwise, personal injury or equipment damage may
occur.
Part Numbers Affected
 541741-541749 - 2-Way Multimedia Taps (Rev A through G)
 541751-541758 - 4-Way Multimedia Taps (Rev A through G)
 573450-573458 - 2-Way Multimedia Faceplates (Rev A through G)
 573459-573466 - 4-Way Multimedia Faceplates (Rev A through G)
Overview
 738447 - Surge-Gap™ 2/4-Way PDU with positive temperature coefficient
(PTC) (SGPDU2/4) (Rev A and B)
 758445 - Surge-Gap 2/4-Way PDU without PTC (SGPDU2/4) (Rev A and B)
The Rev A through G taps were shipped until ~ February 2000
The Rev A and B PDUs were shipped until ~ August 2004
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4013835 Rev D
Issue and Solution
Issue and Solution
Issue
It has been discovered that some older versions of the Cisco Multimedia Taps may
not make consistent ground contact with all revisions of the PDU.
The ground fingers of the Rev A and B PDU may not be able to make sufficient
contact with the Rev A through G taps.
Refer to the illustration below for the location of the PDU ground fingers.
The ground surface of the Multimedia Tap on these older versions is limited by the
PWB soldermask. If the ground fingers from the PDU do not make proper contact
with the faceplate ground, you may see a glitch in the response frequency in the
range of 600 MHz to 750 MHz.
Note: Multimedia Taps with Revision H or later (those shipped since ~ March 2000)
do not require this rework. The ground surface area for these units is sufficient for
grounding all revisions of PDUs.
4013835 Rev D
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Issue and Solution
Refer to the illustration below for a comparison of the ground surface between taps
manufactured prior to Revision H and to Revision H or later taps.
Additionally, it is not necessary to add the ground bracket to any revision of tap
being used with a Revision C or later PDU (those shipped since ~ Sept 2004). An
additional ground finger added to the Revision C and later PDUs allows them to
work consistently with all revisions of taps.
Refer to the illustration below for the location of the part number and revision for
the taps.
Solution
On standard profile Multimedia Taps 2-way and 4-way manufactured prior to
Revision H, a ground bracket should be added to the surface between two mounting
screws (in two places) to increase the ground surface area for the PDU ground
fingers. Refer to Bracket Installation Procedure (on page 5).
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4013835 Rev D
Issue and Solution
Bracket Installation Procedure
CAUTION:
Do not remove the protective plastic cover that is attached to the tap circuit
board. Access to the screws that will fasten the ground bracket will be
accessible with this cover in place.
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1
Remove the faceplate from the tap housing.
2
Insert the ground brackets between the circuit board and the head of each of the
two screws. This ground bracket is to be installed in two places as shown in the
illustration below.
3
Screws should be re-torqued from 5 to 8 in-lbs (0.56 to 0.90 nm) prior to
reinstalling the faceplate onto the housing.
5
For Information
For Information
If You Have Questions
If you have technical questions, call Cisco Services for assistance. Follow the menu
options to speak with a service engineer.
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4013835 Rev D
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August 2012 Printed in USA
Part Number 4013835 Rev D