3. Using the Front Panel
3160-A2-GB24-10 March 2001 3-5
LEDs
There are twelve LEDs on the DSU/CSU front panel. The five LEDs on the right
(Figure 3-5, DSU/CSU LEDs) are shared between the DTE Drop/Insert (DSX-1)
interface and the data ports. Refer to

Selecting the DTE Drop/Insert or Data Port

for LED Display

on page 3-12 to choose which port’s status the LEDs display.
NOTE:
The DTE Drop/Insert (DSX-1) interface is only available on 2-port and 4-p ort
DSU/CSUs.
Figure 3-5. DSU/CSU LEDs
A green LED indicates normal operation. A yellow LED indicates a warning (for the
DTE Drop/Insert interface) or activity (for the data ports). Conditions are samp led
every tenth of a second.
The twelve front panel LEDs are grouped into four sections:
System LEDs (Tab le 3-1 )
Network Interface LEDs (Tab le 3-2 )
DTE Drop/Insert (DSX-1) Interface LEDs (Tabl e 3-3 )
Data Port LEDs (Tabl e 3-4 )
493-14301
OK TEST SIG OOF ALRM
NETWORK TXD
EER SIG ALRM PDVOOF BPV
FAIL
DTR RXD CTS RTS