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Mapping the Working and Protect Line Cards to the RF Switch
Attenuators
A 10-dB attenuator may be required (due to a higher IF output, +42 dBmV), between the line card and
the upconverter IF input ports.
Mapping the Working and Protect Line Cards to the RF Switch
Mapping is applicable for both working and protect cable interface line cards when employing N+1
redundancy. The distinction between which line card serves as the protect line card and which serve as
the working line cards is determined by whether the header block is plugged into a working group
(CMTS) or protect group (PROTECT) of slots on the RF switch, and by the configuration you specify.
Use these guidelines to map the cables between each Cisco uBR7246VXR router, the RF switch, and the
external upconverter:
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•
•
•
•
•
Before you cable the CMTS (Cisco uBR7246VXR routers) to the Cisco uBR 3x10 RF Switch, review
the
Cables (Cisco uBR-MC28x Line Card)" section on page
Refer to the "N+1 Redundancy for the Cisco CMTS" chapter of the Cisco Cable Modem Termination
System Feature Guide for information about system configuration
Use the color designations to help determine a cable location, US0–red, US1–white, and so on. For the
Tip
Cisco uBR-MC16x card cable color information, refer to
Cisco uBR-MC28C card cable color information, refer to
The output cables are connected to the CABLE PLANT section of the RF switch. The CABLE PLANT
header blocks are wired in the opposite sequence to the CMTS and PROTECT header blocks (CABLE
PLANT—1H–1A).
Slot number one (CABLE PLANT—1H–1A) is located on the far right.
Note
Cisco uBR-3x10 RF Switch Hardware Installation and Cabling Guide
5-6
All cards in the hot standby communication-to-communication protocol (HCCP) group (protect card
and working cards) must be the same type of card. For example: an MC16C working card must use
an MC16C protect card.
Colored cables are used to help facilitate the cabling process. Any color is acceptable as long as it
meets the cable specifications. If you are using colored cables, connect the same colored cable to
the same port on each of the cable interface line cards in each of the Cisco uBR7246VXR routers.
Example: The red cable in each bundle goes to the US0 port on each card.
Each header block supports one line card. Each header block is cabled exactly the same. For
example: The red cables on the US0 ports (applies to all the line cards) go to the "1A, 2A, 3A
(.....)8A" connector locations.
If you are using an external upconverter, the DS ports on the line cards are cabled to the external
upconverter first, then cabled from the upconverter to the RF switch.
The RF switch MCX connections labeled F, G, and M are used only for downstream connection. The
downstream cables from the upconverter can be connected to any one of the three available
downstream MCX connections. F is the preferred connection point for Cisco uBR-MC16x cards.
The MCX connection labeled N on the header block does not connect to anything in the
Cisco uBR 3x10 RF Switch and should not be connected to any cable interface port either.
"Connecting the Cables (Cisco uBR-MC16x Card)" section on page 5-8
Chapter 5
Cabling the RF Switch With the Cisco uBR7246VXR CMTS
5-16.
Table 5-2 on page
Table 5-11 on page
or the
"Connecting the
5-9. For the
5-17.
OL-1984-06
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