CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 15)

Chapter 1 Introduction
2201 Rack Chassis
15
An 8-position DIP switch labeled Clock is on the front panel. This switch is for control of operating
modes and internal clock rates. For more information, see Chapter 3, "Mode and Rate
Selection".
A loopback control switch labeled Loop is located on the front panel. Use of this switch is covered
in Chapter 5, "Troubleshooting", and Chapter 6, "Diagnostic Procedures".
The electrical power connection and fiber optic connections are made on the rear panel of the
modem.
The HI/LO optical power switch is also located the rear panel of the modem. For more
information, see “HI/LO Optic Power Switch” on page 21.
1.2 2201 Rack Chassis
The 2201 Rack Chassis is designed to accommodate up to ten 2200 series modems, except for
the MC1 and MC2 interfaces. For the Model 2240 Modem with MC1 and MC2 interfaces, only
five modems can be installed in the Rack Chassis. The 2201 Rack Chassis offers a variety of
features including local audible/visible and remote power failure alarms, optional redundant
power supply. Rack-mount modems are hot-swappable.
Sync Green Two LEDs: Rem (remote) and Loc (local).
Rem and Loc will be on when two 2240 modems are
connected together with fiber optic cable, the Tx of each
modem connected to Rx of the other modem. All front panel
switches must be in the closed position.
Single modem test: Rem and Loc should be on when you
connect a short fiber optic cable from Rx to Tx on the same
modem. All front panel switches must be in the closed
position.
Data Red Two LEDs: Rx (receive) and Tx (transmit). Tx and Rx are on
when data is passed in both directions.
Table 1-1. Front Panel LEDs
LED Color Description