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Chapter 1. Introduction
1-2 DSU 56/64 User Manual 61200062L1-1
FRONT PANEL
As shown in Figure 1-1, the front panel of the DSU 56/64 contains
eleven light emitting diode (LED) indicators that display DTE
interface, network, and test status. These indicators are defined in
the LED Identification section, below.
Figure 1-1. DSU 56/64 Unit
LED Identification
DTE Status (Green)
Network Status (Red)
SELECT
ERRORPTRNRDL
TEST
LOOPDTE
TEST
DSU 56/64
CDRDTDCSRS ALM
Indicator Definition Source
RS
CS
TD
RD
CD
Request To Send
Clear To Send
Transmit Data
Receive Data
Carrier Detect
DTE
DSU
DTE
DSU
DSU
The active state for the status indicators (RS, CS, and CD) is On while
the on state for the data indicators (TD and RD) represents a Space con-
dition.
ALM O
N
indicates a problem on the local loop or within the
DDS network.
O
FF
indicates normal loop and network conditions.