Technical data
Operating the ARN/DC
116273-B Rev 00
3-7
DSU/CSU LEDs
Table 3-9
describes the DSU/CSU adapter module LEDs.
FT1/T1 DSU/CSU LEDs
Table 3-10
describes the FT1/T1 DSU/CSU adapter module LEDs.
X.25 PAD LEDs
Table 3-11
describes the X.25 PAD adapter module LEDs.
Table 3-9. DSU/CSU LEDs
LED Meaning
TxD
(Transmit Data)
Lights when the interface transmits data over the network.
RxD
(Receive Data)
Lights when the interface receives data from the network.
CD
(Carrier Detect)
Lights when the interface detects a connection to another device.
Test Lights when the interface is in test or loopback mode.
Table 3-10. FT1/T1 DSU/CSU LEDs
LED Meaning
Red ALM Lights when the T1 port is in a red alarm state.
Yellow ALM Lights when the DSU/CSU receives a yellow alarm signal
from the T1 network.
Loop Lights when you set the T1 interface to loopback mode.
Synch Lights when the T1 port is synchronized with the T1 network.
Table 3-11. X.25 PAD LEDs
LED Meaning
TxD
(Transmit Data)
Lights when the X.25 PAD
interface transmits data over the
network.
RxD
(Receive Data)
Lights when the X.25 PAD interface receives data from the
network.