CANOGA PERKINS 2270 Fiber Optic Modem - Manual (Page 14)

14
Canoga Perkins
Table 1-C. 2270 Switch Functions
LOOP TEST switch on Front Panel (described in Section 5, “Troubleshooting”).
LOC position will activate a local interface loopback.
REM position will activate a System Test and control the state of the far-end loopback.
OFF position is for normal transmission.
TRANSMIT OPTIC POWER switch on Rear Panel (described in Section 1.9).
HI position is used for link losses from approximately 10 dB and greater.
LO position is used for link losses below 10 dB.
RECEIVER SENSITIVITY switch on Rear Panel (described in Section 1.9).
See NOTE 1
The position of this switch is dependent on both the loss of the Rx link and the position
of the Tx optical power switch on the modem at the other end.
CLOCK RATE switches on Front Panel (described in Section 2).
Switches 1-3 control both the internal clock rate and the System Test rate. The rate is
also dependent on the frequency of the installed oscillator.
CLOCK MODE switches on Front Panel (described in Section 2).
Switches 4-6 control the transmitter clock mode (external/slave/internal).
Switch 7 controls the transmitter sensitivity to RTS used for flow control.
Switch 8 enables selecting an alternate loopback method (refer to Section 5 for
Loopback options).
NOTE 1: Power should be cycled after changing switch. The unit must be powered down
whenever a setting is changed.