
Operation
3-7
3170-A2-GB20-30
March 1999
Table 3-4
Data Port LEDs
Name
Color
Meaning
DTR
Green
Monitors the state of interchange circuit CD (ITU-T 108/1, /2) – Data Terminal Ready
received from the synchronous data DTE.
ON :
DTR is being asserted by the synchronous data DTE.
OFF :
DTR is not being asserted.
TXD
Yellow
Monitors activity on interchange circuit BA (ITU-T 103) – Transmitted Data. This is the
data sent from the synchronous data DTE to the data port on the E1 DSU/CSU.
ON :
Ones are being received from the synchronous data DTE.
OFF :
Zeros are being received from the synchronous data DTE.
CYCLING:
Both ones and zeros are being received from the synchronous
data DTE.
RXD
Yellow
Monitors activity on interchange circuit BB (ITU-T 104) – Received Data. This is data
sent to the synchronous data DTE from the data port on the E1 DSU/CSU.
ON :
Ones are being sent to the synchronous data DTE.
OFF :
Zeros are being sent to the synchronous data DTE.
CYCLING:
Both ones and zeros are being sent to the synchronous data DTE.
CTS
Yellow
Monitors the state of interchange circuit CB (ITU-T 106) – Clear-to-Send sent to the
synchronous data DTE.
ON :
CTS is being asserted by the E1 DSU/CSU.
OFF :
CTS is not being asserted.
RTS
Yellow
Monitors the state of interchange circuit CA (ITU-T 105) – Request-to-Send received
from the synchronous data DTE.
ON :
RTS is being asserted by the synchronous data DTE.
OFF :
RTS is not being asserted.
Содержание 3172
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