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MULTIPORT CSU/DSU
5. Operation
After you properly configure and install the Multiport CSU/DSU, it should operate
transparently. This section describes power-on, the LED status monitors, and the
built-in loopback test modes.
5.1 Power-On
To apply power to the CSU/DSU, first read
Section 4.3
, and make sure that the
CSU/DSU is connected to the included power supply. Then turn on the rear
power switch.
5.2 LED Status Monitors
The CSU/DSU features 24 front-panel LEDs that monitor the line rate, power,
DTE signals, network connection, and test modes.
Figure 5-1
shows the front-panel
location of each LED. Following
Figure 5-1
is a description of each LED’s function.
Figure 5-1. Front Panel of the Multiport CSU/DSU.
•
Power
—Glows red when power is present.
•
Line Rate
—The corresponding LED will glow red to indicate the selected line
rate.
•
TD and RD
—Glow red to indicate an idle condition of binary 1 data on the
respective terminal interface signals. Green indicates binary 0 data.
•
RTS
—Glows green to indicate that the Request to Send signal from the DTE is
active.
Power2.4 kbps
4.8 kbps
9.6 kbps
19.2 kbps
38.4 kbps
56 kbps64 kbps
TD
RD RT
S
CTS DCD DSR DTR
No Signal
Error Test Mode
Local-
Normal-
Remote-
-Errored
-Off
-Normal
Control Port
Loop Pattern
Line
Status
DTE Status
Line Rate
Test Modes
Multiport CSU/DSU
