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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 for both the data channel and
trunk status. Two back panel connectors provide the data and trunk
connections. A circular power connector is provided to connect the
external power supply.
2.2 Front Panel
The front panel contains two sets of LEDs that provide the status of the
data and trunk connections. The data LEDs display the activity of the
data port, if V.35 interface signaling is used, and whether command
mode is active. The trunk LEDs display status whether the trunk is
transmitting or receiving frames, link status, and congestion.
Figure 2-1. Front Panel
Data
35 Lights when the data port is configured for a V.35
interface. That is, the data shunt is in the V.35 position.
CM Command Mode (CM) LED lights when the Data/
Command mode switch is in the Command mode
position and blinks when the unit is in test mode.
TD Transmit Data (TD) LED blinks when data is being
transmitted - on for a space and off for a mark.
RD Receive Data (RD) LED blinks when data is being
received - on for a space and off for a mark.
DSU
TD Transmit Data (TD) LED blinks when data is being
transmitted - on for a space and off for a mark.
RD Receive Data (RD) LED blinks when data is being