Cisco Systems uBR10-MC5X20H, uBR10-MC5X20S User Manual

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Cabling the
Cisco uBR10-MC5X20S/U/H
Cable Interface Line Card with
Universal Cable Holder—UCH2

1 Feature Description
2 Installing the Cables
3 Installing the UCH
4 Removing the UCH
5 Removing the Cables
6 Troubleshooting
7 Related Documentation

Warning

Only trained and qualified
personnel should be allowed to
install, replace, or service this
equipment.

Caution Use an ESD-preventive wrist or ankle

strap during the line card installation.

1 Feature Description

The Cisco uBR10-MC5X20S, U and H cable
interface line cards use 75–ohm precision video
coax cables and 75–ohm MCX connectors to
connect to the CMTS.

This document describes how to install and remove
cables and the second generation universal cable
holder (UCH2).

Figure 1 shows the cards in a Cisco uBR10012
router.

Figure 1 Cisco uBR10-MC5X20S/U/H Cards

uBR10-MC5x20S-D

P
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US0

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Downstream

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DS1

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DS2

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DS3

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RF

The cables come in kits that consist of cable sets
and spare F connectors.

The MC5X20 dual-shielded cable kit includes:

• T wo 10-bundle MCX to “F” conn., 3–m cables

• One 5-bundle MCX to “F” conn., 3–m cables

• 28 spare F connectors

The MC5X20 quad-shielded cable kit includes:

• Five 5-bundle MCX to “F” conn., 3–m cables

• Five spare F connectors

The cable kits do not contain the universal cable
holder (UCH); however, the UCH is available with

uBR10-MC5x20S-D

uBR10-MC5x20S-D

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OC–48/STM–16 POS/SRP SM–LR

OC–48/STM–16 POS/SRP SM–LR

OC–48/STM–16 POS/SRP SM–LR

OC–48/STM–16 POS/SRP SM–LR

72783

line card accessory kits and spare cards. Or, the
UCH2 is available as a spare.

Note In European markets only , you must use

the quad-shielded cable kit with the
Cisco uBR10-MC5X20H.

Tools required for cable installation include:

• 1/4-in. slotted screwdriver and T-10 TORX
driver

Also see “Tool Manufacturers and Part Numbers.”

2 Installing the Cables

The UCH must be used for all Cisco uBR10­MC5X20S/U/H line card cable connections.
Failure to use the UCH may cause permanent
damage to the line card connectors and result in
low or no RF output.

Step 1 Loosen the top screws and slide open the

lock bar. (If the UCH2 is already installed
in the line card, use a screwdriver to slide
open the bar. See Figure 5.)

Step 2 Remove the ESD cap from a cable, and

insert it into the hole in the UCH2. See
Figure 2.

We recommend that the cables be installed
in the UCH as shown in Table 1 and
Table 2.

Caution If using quad-shielded cables, make

sure there is no heat-shrink wrap on
the ends by the MCX connectors.

Table 1 Port—Dual-Shielded Cable Colors

US0–US9 US0 to US9–red, white, blue, green,

yellow, violet, orange, black, gray,
brown, respectively.

US10–US19 US10–grey; US11–brown; US12 to

US19–red, white, blue, green, yellow,
violet, orange, black, respectively.

DS0–DS4 DS0 to DS4–red, white, blue, green,

yellow, respectively.

Table 2 Port—Quad-Shielded Cable Colors

US0–US9 US0 to US9–red, white, blue, green,

yellow , red, white, blue, green, yellow,
respectively.

US10–US19 US10 to US19–red, white, blue, green,

yellow , red, white, blue, green, yellow,
respectively.

DS0–DS4 DS0 to DS4–red, white, blue, green,

yellow, respectively.

Step 3 Insert the cable completely into the UCH.

(The cables will fit loosely in the holes
until the lock bar is closed in Step 5.)

Caution Do not kink the cables.

Figure 2 Inserting a Cable in the UCH2

155826

Step 4 Repeat this procedure for all of the cables.
Step 5 Ensure the cables are fully inserted in the

UCH2 and slide the lock bar closed
completely. (The lock bar will not close if
cables are not fully inserted or properly
aligned.)

Step 6 Using the T-10 TORX driver tool tighten

the screws on the lock bar (maximum
torque—10 in-lbs).

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Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
USA
http://www.cisco.com
Tel: [phone]

800 553-NETS (6387)

Fax: [phone]

Copyright © 2006 Cisco Systems, Inc. All rights reserved. Cisco, Cisco IOS, Cisco Systems, and
the Cisco Systems logo are registered trademarks of Cisco Systems, Inc. or its affiliates in the U.S.
and certain other countries. All other trademarks mentioned in this document or Website are the
property of their respective owners. The use of the word partner does not imply a partnership
relationship between Cisco and any other company. (0601R)

Printed in the USA on recycled paper containing 10% postconsumer waste.

78-17657-02

3 Installing the UCH

After the cables are installed in the UCH, perform
the following steps to prevent ESD damage to the
line card.

Note Before proceeding, remove the protective

sticker covering the line card DS ports.

Step 1 Make sure that you are grounded using an

ESD-preventive wrist or ankle strap.

Step 2 Attach a jumper cable to the ground point

on the chassis.

Step 3 Briefly touch each cable’s center connector

with the jumper cable to remove any
built-up ESD potential.

Step 4 Position the UCH2 so the red line is on the

same side as the red triangle on the
faceplate.

Figure 3 Installing the UCH

Red line

US0

US1

US2

US3

US4

US5

US6

US7

US8

US9

Cutout

Lead screw

Step 5 Align the end pins with the pin holes in the

faceplate, and guide the UCH onto the
faceplate.

Step 6 Hold the cables and UCH in place while

finger tightening the leadscrew. Do not
bend the cables at right angles.

Step 7 Use the flathead screwdriver to tighten the

leadscrew 10 in–lbs, (maximum torque
15 in.-lbs).

Small pin

Red triangle

Shroud

Large pin

155818

Caution Torquing the leadscrew to more than

20 in-lbs can cause the leadscrew to
fail.

The UCH is fully engaged when the
semi-circles on the shroud show metal and
the red and black lines are completely
covered. See Figure 3.

4 Removing the UCH

Step 1 Make sure that you are grounded using an

ESD-preventive wrist or ankle strap.

Step 2 Loosen the lead screw (counterclockwise)

until it disengages from the faceplate.

Step 3 Gently pull the UCH straight away from

the faceplate.

Note If the UCH does not easily pull away from

the card, loosen the lead screw until it
completely disengages from the faceplate.

Figure 4 Removing the UCH

Red line

US0

US1

1/4 in. flathead

screwdriver

US2

US3

US4

US5

US6

US7

US8

US9

Shroud

155819

5 Removing the Cables

Step 1 Use the T-10 TORX driver tool to loosen

the lock bar on the side you want to
remove cables.

Step 2 Slide the lock bar open by hand, or with a

flathead screwdriver if the bar is stuck or
hard to access. See Figure 5.

(Make sure the lock bar is completely open
or the cables will not release.)

Caution Be careful not to bend the cables.
Step 3 Carefully pull the cable out of the hole.

Figure 5 Sliding Open the Lock Bar

155820

6 Troubleshooting

Check the following:

1. Verify that the lead screw is tight.

2. Verify that the shroud fits snugly against the

faceplate (the cutouts are closed).

3. Verify that the cables are properly seated and
secure in the UCH.

If downstream RF power measurements are made, use
these ESD precautions to prevent damage to the
product:

1. Check for a proper ground on the equipment and
chassis before connecting any cables.

2. Ensure that there is a common ground between all
the test equipment that you are using and the unit
under test.

3. Keep test cables as short as possible to limit static

buildup.

4. Before attaching any test cables to the unit under

test, momentarily ground the center pin of the test
cable to remove any ESD potential that may be
present.

Contact Cisco TAC for further information:
http://www.cisco.com/tac

Tool Manufacturers and Part Numbers

Tab le 3 Too l Part Nu mb er s

Cisco Systems

MC5X20 dual-shielded
MC5X20 quad-shielded
UCH2

White Sands Engineering, Inc.

F and MCX crimper tool PN–ACT-483
MCX connector strip tool:

Dual-shielded cables
Quad-shielded cables

Dual-shielded F connector
strip tool

Quad-shielded F connector
strip tool

75–ohm precision miniature
video cable:
Dual-shielded single cable
Quad-shielded five pk

MCX fixed pin conn.:
Dual-shielded cable
Quad-shielded cable

F conn.:
Dual-shielded cable
Quad-shielded cable

CAB-RFSW520TPMF=
CAB-RFSW520QTPMF=
CAB-520-UCH2

PN–CPT-7538-125
PN–CPT-7538-200Q

CPT-7538

CPT-7538Q

PN–WS940
PN–WS386

PN–MCXFP
PN–MCXFPQ

PN–ASFP
PN–ASFPQ

7 Related Documentation

• Cisco uBR10-MC5X20S/U/H Cable Interface
Line Card for the Cisco uBR10012 Router:

http://www.cisco.com/univercd/cc/td /doc/
product/cable/ubr10k/ubr10012/frus/
index.htm

• More Cisco cable products information: