5.0 OPERATION
Once you have configured each Model 2020RC and connected the
cables, you are ready to operate the units. This section describes the
LED status monitors, clocking requirements and the power-up
procedure.
5.1 LED STATUS MONITORS
The Model 2020RC features thirteen front panel LEDs that indicate
the condition of the modem and communication link. Figure 6 (below)
shows the positions of the LEDs, and the bullets describe their
functions.
• Power
- will glow green when power is applied to the Model
2020RC front card.
•
TD
(Transmit Data) - indicates status of transmit data from the
DTE. Red indicates a mark or idle state. Green indicates a space
or active state.
•
RD
(Receive Data) - indicates status of receive data from the
DCE. Red indicates a mark or idle state. Green indicates a space
or active state.
•
RTS
(Request to Send) - indicates status of Request to Send
from the DTE. Red indicates a mark or idle state. Green indicates
a space or active state.
•
CTS
(Clear to Send) - indicates status of Clear to Send from the
DCE. Red indicates a mark or idle state. Green indicates a space
or active state.
(continued)
•
CD
(Carrier Detect) - indicates status of Carrier Detect from the
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DCE. Red indicates a mark or idle state. Green indicates a space
or active state.
•
DTR
(Data Terminal Ready) - indicates status of Data Terminal
Ready from the DTE. Red indicates a mark or idle state. Green
indicates a space or active state.
5.2 CLOCKING
The Model 2020RC supports all clocking methods, whether clock is
supplied by the DCE or DTE, and whether it is supplied by the V.35 or
RS-232 device. No special configuration of the Model 2020RC is
required (or possible) with respect to clocking.
5.2 POWER-UP
There is no power switch on the Model 2020RC: Power is
automatically applied to the 2020RC when its card-edge connector
touches the chassis' mid-plane socket, or when the chassis' power is
turned on.
Note: The 2020RC is a "hot swappable" card—it will not be
damaged by plugging it in or removing it while the rack is powered up.
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