Canoga Perkins 2240 User Manual download pdf (Page 16)

Canoga Perkins 2201 Rack Chassis/2200R Redundant Card

SW2-1 (SIMPLEX) This switch is only closed when the system is set up for

Simplex operation (data transmission in one direction

only). Only the switch at the transmit end is closed.

SW2-2 (EXTCLK) This switch determines whether both directions of data

flow will be switched together or not. When SW2-2 is

OPEN, both directions of data flow switch together

(operations on both primary modems or both secondary

modems). With the switch closed, the primary modems

can be sending data in one direction while the second-

ary modems are sending data in the other direction. If

the modems are configured for INTERNAL CLOCK,

SW2-2 must be open. Either position of this switch may

be used for EXTERNAL CLOCK operation with the

resulting switching differences described above. For the

sake of simplicity, it is recommended that this switch be

left in the OPEN position.

SW2-3 (SYNC) This switch must be set to the OPEN position for all

modem types except the 2240. For use with 2240s,

SW2-3 must be CLOSED.

SW2-4 (SP-1) This is a spare switch.

NOTE: For Models 2270 and 2290, if the internal clock mode is

configured, the flow control option on the modems must be en

abled. The flow control operation of the modem is required for

proper redundant switching.

Two jumpers are provided, W7 and W8, for configuring chassis ground connections.

Jumper W7 connects signal ground to chassis ground. Jumper W8 allows the signal

ground to float. Note that the W2 jumper on the power distribution board can override

the W7/W8 jumper. Refer to Section 2.1.2 for more information.

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Canoga Perkins 2240 User Manual Page 16