Cisco Systems UBR-3X10 manual RFS 1 Color RFS Color, Gray Brown, Unused downstream Not connected

Chapter 4 Cabling the RF Switch With the Cisco uBR10012 CMTS Cable Interface Line Cards

Mapping the RF Cables from the Working and Protect Line Cards (MC16x, MC28C) to the Cisco uBR 3x10 RF Switch

Mapping the Cisco uBR10-LCP2-MC28C Cable Interface Line Cards to the RF Switch

When you connect RF cables between the RF switch and a Cisco uBR10-LCP2-MC28C cable interface line card installed in a Cisco uBR10012 router, ensure that all the RF cables in the bundle attach to interfaces on the same cable interface line card installed in the Cisco uBR10012 chassis. (See Figure 4-9 on page 4-14.)

The following guidelines can help you map the cables between the RF switch and the Cisco uBR10012:

•The cable interface ports labeled A to E and H to L on the header blocks are used for the upstream port connections on the Cisco uBR10-LCP2-MC28C line card installed in the Cisco uBR10012 CMTS.

•The cable interface ports labeled F, G, and M are used only for the downstream port connections.

–The DS0 and DS1 ports on Cisco uBR10-LCP2-MC28C are cabled first to the upconverter and then from the upconverter to the RF switch. A 10-dB attenuator may be required between the line card and the upconverter., due to a higher IF output.

•The cable interface port 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.

Note We recommend that the protect card be installed in slot 5/1 because this slot is directly below the PROTECT section on the RF switch.

Table 4-2provides one permutation of the connection between a header block attached to a

Cisco uBR 3x10 RF Switch and the cable interfaces on a Cisco uBR10-LCP2-MC28xinstalled in a Cisco uBR10012 CMTS.

Tip Notice the relationship between the cable color and location in the RF switch.

Table 4-2	Sample Mapping of a Cisco uBR-MC28C Line Card to the Cisco uBR 3x10 RF Switch
Connect to the Cable Interface on the CMTS		RFS1 (Color)	RFS (Color)	Connect to the Cable Interface on the CMTS
US0 of first MAC domain		A (Red)	H (Yellow)	US0 of second MAC domain
US1 of first MAC domain		B (White)	I (Violet)	US1 of second MAC domain
US2 of first MAC domain		C (Blue)	J (Orange)	US2 of second MAC domain
US3 of first MAC domain		D (Green)	K (Black)	US3 of second MAC domain
(Unused upstream)		E	L	(Unused upstream)
DS0		F (Gray)	M (Brown)	DS1
(Unused downstream)		G	N	(Not connected)

1. RFS—RF switch, location of the MCX connection on the RF switch.

Cisco uBR-3x10 RF Switch Hardware Installation and Cabling Guide

OL-1984-06 4-13