HR4420/i/p Installation Guide
6
Status Indicators
The status indicators operate as follows:
ON
Illuminates steady red when power is applied.
LAN 0, 1, 2, 3
Illuminate steady when there is a network connection to the
associated LAN port and flash when data is transmitted or
received.
3G/GSM:
NET, SIM,
DAT
These indicators operate as follows:
NET
– Illuminates green when a wireless network has been
detected.
SIM
– Illuminates green when a valid SIM card is installed in the
unit.
DAT
– Flashes green when data is being transmitted or received.
SIGNAL
The three indicators labelled SIGNAL illuminate to indicate the
wireless signal strength as follows:
None illuminated
< -113 dBm (effectively no signal)
1 LED illuminated
>= -112 dBm and <= -87dBm (weak)
2 LED‟s illuminated
>= -86dBm and <= -71dBm (medium)
3 LED‟s illuminated
>= -70dBm and <= -51dBm (strong)
ISDN:
D, B1, B2
On the HR4420i, these indicators operate as follows:
D
– Illuminates green when the unit is connected to an ISDN
network and the D-channel signalling layer is active.
B1
– Illuminates green when ISDN B-channel 1 is active and
flashes when data is being transmitted/received over this
channel.
B2
– Illuminates green when ISDN B-channel 2 is active and
flashes when data is being transmitted/received over this
channel.
PSTN:
OH, CD, DAT
On the HR4420p, these indicators operate as follows:
OH
– Illuminates green when the modem has gone off-hook.
CD
– Illuminates green when the unit has connected to a remote
modem and asserted the Carrier Detect signal at the serial port.
DAT
– flashes green when the unit has connected to a remote
modem and data is being transferred.
