Cabletron Systems SmartSwitch SBU128, Руководство пользователя

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Front and Rear Panel Descriptions
80-10200000-01 3–3
3.1.1 USER Indicators
The indicators for USER 1 reflect the signal activity on the X21 or V35
User connectors, depending which interface pcb is fitted.
TxD/T Lights to indicate the state of Transmit Data as being ON
(SPACE).
RxD/R Lights to indicate the state of Receive Data as being ON
(SPACE).
DTR/C Lights to indicate the state of Data Terminal Ready as
being ON (SPACE). With the X21 interface this indicates
the state of the Control circuit.
DCD/I Lights to indicate the state of Data Carrier Detect as being
ON (SPACE). With the X21 interface this indicates the
state of the Indicate circuit.
TxCLK/S Lights to indicate the state of Transmit Clock as being ON
(SPACE). With the X21 interface this indicates the state of
the Signal Element Timing circuit.
RxCLK Lights to indicate the state of Receive Clock as being ON
(SPACE). With the X21 interface this indicator is not used.
RTS Lights to indicate the state of Request To Send as being
ON (SPACE). With the X21 interface this indicator is not
used.
CTS Lights to indicate the state of Clear To Send as being ON
(SPACE). With the X21 interface this indicator is not used.
DSR Lights to indicate the state of Data Set Ready as being ON
(SPACE). With the X21 interface this indicator is not used.
RI Lights to indicate the state of Ring Indicate as being ON
(SPACE). With the X21 interface this indicator is not used.