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2.1
Introduction
This chapter describes the front panel LEDs and back panel connectors. The front panel has one row of
LEDs. Two back panel connectors provide the data and DDS or LADS connections. A circular power
connector is provided to connect the external power supply.
2.2
Front Panel
The front panel has five LEDs that provide the status of the line. The V35 LED lights if V.35 interface signaling
is used. The line LEDs display status whether the line is transmitting or receiving frames, and line status.
TD
RD
V35
NS
OOS The Out Of Service (OOS) LED lights when an outage condition occurs. This
CD
Figure 2-1. Front Panel
Transmit Data (TD) LED blinks when data is being transmitted - on for a space and
off for a mark.
Receive Data (RD) LED blinks when data is being
received - on for a space and off for a mark.
The V35 LED lights when the shunt is in the V35 position.
The No Signal (NS) LED lights when no signal is received from the network or when
the signal is too weak for normal operation.
happens when there is a failure in the digital service that is detected by the network
and the Telco sends a repetitive OOS sequence.
The Carrier Detect (CD) LED lights when a carrier signal is received from the
network.
Chapter 2 - Front & Back Panel Descriptions
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