Paradyne ACCULINK 317x E1 - Manual (Page 29)

Operation
3-7 3170-A2-GB20-20 December 1996
Table 3-4
Data Port LEDs
Name Color Meaning
DTR Green Monitors the state of interchange circuit CD (CCITT 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 (CCITT 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 (CCITT 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 (CCITT 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 (CCITT 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.