Canoga Perkins 2240 User Manual download pdf (Page 17)

2201 Rack Chassis/2200R Redundant Card Canoga Perkins

2.2.2 Redundant Card Operation

The 2200R Series Redundant Card allows a single data electrical interface to be shared

between two fiber links.

This model can be operated in three modes: Remote control, Manual control, and

Automatic. In the Remote control mode, two inputs are provided to permit forcing the

modems to receive on either the primary or secondary link. Transmission occurs only

over the selected link.

The Remote control mode will override either the Manual or Automatic mode. If

Remote operation is not desired, leave the remote inputs unconnected.

To force operation to the primary link, connect the secondary input LOW (LOW =

short to ground, TTL low or RS-232 OFF [negative voltage]) while leaving the primary

input HIGH (HIGH = leave floating, TTL high or RS-232 ON [positive voltage]). To

force operation to the secondary link, connect the primary input LOW, while leaving

the secondary input HIGH.

When not in the Remote control mode, the operating mode is selected by a three

position switch: Primary, Secondary, and Automatic.

The “Primary” and “Secondary” switch positions represent the Manual mode,

which functions exactly as does the Remote control mode. In the Manual mode, the

modem will transmit and receive only on the link selected.

The “Automatic” switch position forces the Automatic mode of operation, the default

operating mode.

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Canoga Perkins 2240 User Manual Page 17