Paradyne 7520, Руководство пользователя, Страница: 35 / 76

Monitoring the DSU
4-11
7520-A2-GB20-20 May 1998
Port LEDs
496-15062
CTS (106) OK ALARM TEST DM OOS OOF NS TXD (103)RXD (104)R
TS (105)
DTR (108)
Network System Port
red green yellow
TXD – Transmitted Data:
ON
– Receiving all 0s from the DTE.
OFF – Receiving all 1s from the DTE.
Blinking – User data is being transferred.
RXD – Received Data:
ON
– Sending all 0s to the DTE.
OFF – Sending all 1s to the DTE.
Blinking – User data is being transferred.
RTS – Request to Send:
ON – DTE is activating a control signal to
indicate readiness to transmit data.
CTS – Clear to Send:
ON – DSU is activating a control signal to
indicate to the DTE that it can start
sending data.
DTR – Data Terminal Ready:
ON – DTE is activating a control signal to
indicate readiness for operation.