Canoga Perkins 2240 User Manual download pdf (Page 18)

Canoga Perkins 2201 Rack Chassis/2200R Redundant Card

NOTE: For use with the Model 2240 Modem only, the Automatic mode

requires the CD/DCD switch on the Modem card to be OFF

and the CD/SYNC to be ON. These are the factory defaults for

the 2240.

In this mode transmit optical energy is applied to both links while the link chosen for

reception is arbitrary, as the active link is determined by the last link selected in the

Manual or Remote control modes immediately before switching to the Automatic

mode.

Thereafter, each end will independently switch links (receive only if EXTCLK [SW2-

2] = CLOSED and modem is in EXTCLK mode) when its Carrier Detect signal turns off

(indicating a link failure). If SW2-2 is in the OPEN position, both directions of the link

will switch. If SW2-2 is in the CLOSED position, only the receive link will switch. The

carrier detector is a function of receive optical power and presence of clock from the

other end. If both links exhibit significant interruptions of Carrier Detect, the modems

will switch back and forth between the primary and secondary links until one modem

turns on its Carrier Detect.

2.2.2.1 2200R Indicator Lights

Four LEDs are provided on the 2200R to indicate the activity state of the redundant

link.

Pwr The first LED is Power ON.

Aut The second LED is an operating mode indicator. “ON” indicates

operation in the Auto mode. When this LED is off, the mode is

indicated by the mode select switch position.

Sec Rcv The third LED defines the link being used for receiving (Secondary

receiver “ON” represents the secondary link).

Alm The fourth LED is an alarm indicator and is turned ON if an auto-

matic switchover occurs while the 2200R is in the Automatic mode.

This implies trouble on the other link. A dry relay contact for a

remote alarm is also provided to indicate this occurrence. This LED

and alarm relay contact are reset whenever the modem is switched

into the Remote control or Manual mode.

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Canoga Perkins 2240 User Manual Page 18