GE D90 Plus Instruction Manual page 72

ELECTRICAL INSTALLATION
DANGER:
Direct input and output link LEDs
62
Figure 31: Direct input and output dual channel connection
The interconnection requirements are described in further detail in this section for each
specific variation of inter-relay communications module. These modules are listed in the
following table. All fiber modules use ST type connectors.
Table 3: Channel communication options
Module Specification
B G.703, 64/128 kbps, two channels
C RS422, 64/128 kbps, two channels, two clock inputs
D 850 nm, 64/128 kbps, ST multi-mode laser, two channels with DDMI
The 850 nm module uses a class 1 VCSEL laser which is very harmful to the eye.
Observing any fiber transmitter output may cause serious injury to the eye!
The link LEDs for channels 1 and 2 are located on the rear of the inter-relay
communications card as shown below.
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 3: INSTALLATION