Cisco Systems uBR-MC28U Folheto

Connect the US cables to the US ports on 
the card (US0–US7). All US ports are light 
blue.

To prevent the alarms from activating, 
administratively shut down the card using the 
shutdown command in interface configuration 
mode before removing it from the chassis. 

Make sure that you are properly 
grounded.

Disconnect all the cables from the cable 
interface line card.

Unscrew the captive installation screws on 
the faceplate. 

Grasp the handle and carefully pull the 
card out of its slot (see Figure 4). 

+42 dBmV

US2

US4

US5

US6

US7

ENABLED

DS0-IF

DS1-IF

uBR - MC28X

US1

US0

US3 

88993

Upconverter

Attenuator

Cable

Connector

88982

U

S

0

U

S

1

U

S

2

U

S

3

U

S

4

U

S

5

U

S

6

U

S

7

E

NA

B

LE

D

DS0-RF

DS1-RF

uBR - MC28U

Always handle the card by the carrier 
edges and handle; never touch the 
cable interface line card’s components 
or connector pins. For proper cooling 
and airflow, always install a line card 
cover in an empty line card slot.

Place the card on an antistatic surface with 
its components facing upward.

If the card is being returned to the factory, 
immediately place it in a static shielding 
bag and proper packaging for protection.

Make sure that the card is securely seated in 
the chassis.

If the captive screws do not tighten all the way, 
the card is not properly seated in the chassis or 
backplane. Carefully pull the card halfway out 
of the slot, reinsert it, and tighten the captive 
installation screws. 

A partially seated line card can cause 
the router to reboot. 

Are all enabled LEDs on? If yes, the system is 
operational. 

If no, check the following possibilities:

If the card has been enabled and 
configured for operations, the enabled 
LED remains on. 

If a port is enabled but its enabled LED is 
still off, check if the card has pulled away 
from the router. Reseat the card in its slot. 
(Do not have to turn off the system power 
to do this.} After the system reinitializes 
the interfaces, the enabled LED on the 
card should come on.

If the enabled LED remains off after the above 
checks, it is likely that the system has detected 
a processor hardware failure. Go to the Cisco 
TAC website 

for 

further information and help. 

ENABLED—green
ENABLED—off

Card operating normally
Card not enabled

US—green
US—off

Upstream enabled
Upstream not enabled

DS—green
DS—off

Downstream enabled
Downstream not enabled

Cisco uBR-MC28U,
with upconverter

Cisco uBR-MC28X,
without upconverter

Cisco uBR-E-28U, 
with upconverter

UBR-MC28U, 
UBR-MC28U=

UBR-MC28X, 
UBR-MC28X=

UBR-E-28U

UBR-E-28U=

Blank covers

UBR-MC-COVER=

Weight—MC28U/E-
28U
Weight—MC28X

6 lbs (2.72 kg)
4.75 lbs (2.15 kg)

MC28U/E-28U
MC28X

80 Watts (273 BTU/h)
50 Watts (170.6 BTU/h)

88985

US2

US4

US5

US6

US7

ENABLED

DS

0-R

F

DS

1-R

F

uBR - MC28U

US1

US0

US3 

Downstream

LEDs

DS0-DS1

Upstream

LEDs

US0-US7

Enabled

LED

Cisco.com

:

For the 1–year warranty information, visit the 
following URL:

Output—MC28U/E-
28U
Output—MC28X

+50 to 61 dBmV at RF

+42 dBmV at IF (+/-2 dB)

Upstream (US0–US7) QPSK 8–, 16–, 32–, 

64–QAM

Downstream 
(DS0–DS1)

64–QAM, 256–QAM

RF output power range—50 to 61 dBmV

Upstream
Downstream

5–65 MHz
70–860 MHz

The Cisco uBR-MC28U/X/E-28U line card is 
compatible with most cable systems worldwide, 
including but not limited to—Asia Pacific, 
Europe, and the Americas. See Cisco IOS release 
notes for more information.