Signal Strength Indicators - Digi transport User Manual

Signal strength indicators

On routers equipped with W-WAN modules, there are three LEDs on the front panel that will
indicate the strength of the signal, as shown in the table below.
LEDs lit
None
1
2
3
X.21 (RS-422)
Description
Transmit Data (A)
Receive Data (A)
Control (A)
Indication (B)
Ground
Clock (B)
Indication (B)
Transmit Data (B)
Receive Data (B)
Clock (A)
Control (B)
1 With respect to Digi routers
2 Direction depends on whether the Digi router is clock sink or clock source.
Digi TransPort User Guide
Signal strength
Under -113 dBm (effectively no signal)
-112 dBm to -87 dBm (weak signal)
-86 dBm to -71 dBm (medium strength signal)
-70 dBm to -51 dBm (strong signal)
RS232 signal Direction
TxDA in
RxDA out
CTLA in
INDA out
GND n/a
CLKB
in or out
INDB out
TxDB in
RxDB out
CLKA
in or out
CTLB in
1
DB 25 Pin#
2
3
4
5
7
9
2
13
14
16
17
2
19
Signal strength indicators
DB 9 Pin#
1
2
3
4
5
n/a
9
6
7
n/a
8
79