5.0 OPERATION
Once you have configured each Model 222NRC and connected the
cables, you are ready to operate the units. This section describes the
LED status monitors and the power-up procedure.
5.1 LED STATUS MONITORS
The Model 222NRC features thirteen front panel LEDs that indicate
the condition of the modem and communication link. Figure 8 (below)
shows the positions of the LEDs, and the bullets describe their functions.
• The green "PWR" LED glows when power is being applied to the
modem card through its mid-plane chassis connection.
• The green "TD" and "RD" indicators blink to show positive state
data activity. The red "TD" and "RD" indicators blink to show
negative state data activity. A solid red light indicates an idle state.
• If your carrier detect strap is configured as “Always On”, the “CD”
light will always be green. If the carrier detect strap is set to
“Normal”, the green LED lights when the carrier is on; the red LED
lights when the carrier is off.
5.2 POWER-UP
There is no power switch on the Model 222NRC: Power is
automatically applied to the 222NRC when its card-edge connector
touches the chassis' mid-plane socket, or when the chassis' power is
turned on.
Note: The 222NRC is a "hot swappable" card—it will not be
damaged by plugging it in or removing it while the rack is powered up.
RJ-45 Cable
SIGNAL
PIN#
PIN#
SIGNAL
GND
†
2-----------------------7
GND
†
RCV-
3-----------------------5
XMT-
XMT+
4-----------------------6
RCV+
XMT-
5-----------------------3
RCV-
RCV+
6-----------------------4
XMT+
GND
†
7-----------------------2
GND
†
†
Connection to ground is optional
11
Figure 8. The Model 222NRC front panel, showing LED positions
Model 1000RC
Power
TD
RD
CD
TD
RD
CD
Unit
A
Unit
B
Model 222NRC
12
