User manual

12
Canoga Perkins 2201 Rack Chassis/2200R Redundant Card
Figure 2-4.
Chassis Ground
Option for 2201
2.2 2200R Redundant Card
NOTE: The 2200R can be used with all 2200 series modems except
the 2245 and 2262 modem cards. When used with the 2270 or
2290, flow control operation is not possible.
Redundant fiber-optic links can be established with any of the applicable modem
types. Two modem cards are interconnected to a third plug-in card called the 2200R
Redundant Modem Controller Card (see Figure 2-5). Special Interface boards, Redun-
dant Paddle Boards (Model designation RPB for 2260s, 2270s and 2290s; 4PB for
2240s), are substituted for the normal I/O boards in the two modems. These RPBs
simply buffer the I/O signals between each modem and the 2200R board. The I/O
board which would otherwise have been plugged into the modem is instead mounted
in the 2200R card. Thus, while the fiber-optic link is redundant, the I/O card function
is not. The 2200R Modem Controller card connects to the two modem cards through
the edge connector on the RPB interface cards via ribbon cables. See Figure 2-6. The
2200R Modem Controller Card provides all the multiplexing, buffering and switchover
logic to implement the redundant fiber optic link. (Refer to Table 2-B for 2200R factory
settings.)
When using the 2200R in the 2201, up to three redundant fiber optic links can be used.
For each fiber redundancy, two modem cards and one 2200R card are required. Mo-
dems must be installed adjacent to the 2200R being used in that link and the 2200R in
a slot between the two modem cards it serves. Keyed ribbon cables are provided for
modem connection.