Cisco Systems uBR-MC28U, uBR-MC28X quick start Purpose, Feature Description, Prerequisites

QUICK START GUIDE

Installing Cisco uBR-MC28U/X

and uBR-E-28U Cable Interface

Line Cards

1Purpose

2Feature Description

3Prerequisites

4Installing the Card

5Removing the Card

6Troubleshooting

7Technical Specifications

8Related Documentation

Warning	Only trained and qualified
	personnel should be allowed to
	install, replace, or service this
	product; and should be properly
	grounded before handling this
	ESD-sensitive product.

1Purpose

This quick start guide shows you how to install a Cisco uBR-MC28 cable interface line card in the Cisco uBR7200 series router.

2Feature Description

The Cisco uBR-MC28 cable interface line card improves RF performance, supports spectrum management, increases system performance and supports online insertion and removal (OIR). The line card is available in three configurations:

•Cisco uBR-MC28U—with an onboard upconverter and green end tabs

•Cisco uBR-MC28X—without an onboard upconverter and with yellow end tabs

•Cisco uBR-E-28U—with an onboard upconverter and slate blue end tabs

3Prerequisites

•The Cisco NPE-400 or Cisco NPE-G1 or Cisco NPE-G2 must be used with this card.

•If you are replacing a Cisco uBR-MC28C card with a Cisco uBR-MC28U/X/E card, you must reconfigure the card. We strongly recommend that you reload the Cisco 7200 series router when replacing a cable interface line card with a card of a different type.

4Installing the Card

Note The uBR-E-28U is an entry-level version of MC28U, for the uBR7225 chassis. The extra guide pins in the line card prevents it from being plugged into a different chassis.

Step 1 Make sure that you are grounded.

Step 2 Use both hands to grasp the card by its metal carrier edges and align the card with the slot guides, component side up.

Step 3 With the metal carrier aligned in the slot guides (see Figure 1), gently slide the card into the card slot until you can feel it seated in the backplane connectors.

Step 4 Tighten the captive screws.

Note The captive screws provide grounding for the electromagnetic interference (EMI) shielding.

Figure 1 Installing the Card in the Chassis

88984

US0	US1	US2	US3	US5	US6	US7	uBR - MC28U	DS0-	DS1-
								RF	RF

Note The cable interface line card insertion/removal method is the same for all Cisco uBR7200 series routers.

Cabling

Caution Do not mix upstream (US) ports in domain 0 with US ports in domain 1 (see Figure 2).

Figure 2 Domain 0 and Domain 1

							uBR - MC28U	DS0-	DS1-
US0	US1	US2	US3	US4	US5	US6	US7
								RF	RF
									ENABLED
		Domain 0				Domain1			88983

Cabling the Cisco uBR-MC28U/E-28U

The Cisco uBR-MC28U/E-28U line card has an onboard upconverter. To cable the card:

Step 1 Connect the downstream (DS) cables to the DS ports (DS0–DS1). RF DS port rings and end tabs are green (slate blue in the case of E-28U card). See Figure 5.

Step 2 Connect the upstream cables to the US ports (US0–US7).

Cabling the Cisco uBR-MC28X

The Cisco uBR-MC28X line card does not have an onboard upconverter. The card may require up to 10 dB of attenuation due to a higher IF output power (higher then legacy Cisco line cards). To cable the card:

Step 1 Connect the DS cables to the DS ports on the card (DS0–DS1).

IF DS port rings and end tabs are yellow. See Figure 3.

Step 2 Add RF attenuators as required to get the correct IF output. Insert the attenuator between the DS IF output cable and the upconverter. See Figure 3.

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