CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 21)

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Chapter 2
Installation and Setup
2.1 Setup
The setting up of the 2240 Modem includes the two-section HI/LO optic power switch, internal
control switches and the signal ground strap. The setup, as described in the following sections,
provides the initial configurations for operation of the unit.
2.1.1 Unpacking the Unit
Each 2240 Modem is shipped factory tested, and packed in protective cartons. Unpack the unit
and retain the shipping carton and protective packing for reuse in the event a need arises for
returning it to the factory.
To assure proper operation of the modem, please inspect it and its shipping carton carefully for
damage. If damage is sustained to the unit, file a liability claim immediately with the freight
carrier.
2.1.2 HI/LO Optic Power Switch
All versions, except for ELED and LP laser models, incorporate an optic power level dual DIP
switch for varying the transmit power of the fiber optic LED or laser (see Figure 2-6). Both
sections of the switch must be set the same. The switch for the 2240 standalone is located on the
rear panel of its enclosure. (The switch for the 2240 Rack Chassis is located at the rear of the PC
card, adjacent to the transmit optical connector.)
The optical power switch provides two settings for optical transmission level. The appropriate
switch setting depends on the loss of the fiber optic link. Each optical model has a different
transition point in terms of loss. Refer to Table 2-1 for the link loss ranges for each optical model.
For example, if the 850nm model is used and the link loss is 5 dB, use the LO setting on that line.
Table 2-1. Link Loss Range
Model
Link Loss Range
HI Power LO Power
850nm Standard >6 dB to Max <6 dB
1310nm HP laser >6 dB to Max <6 dB