MM-5100 Windows Setup Manual 090803 NZ
Page 8 of 44
4/09/2003
5 .
L E D F U N C T I O N S
This section describes the labelling and functions of the LED on the MM-5100.
The RSSI LED will be OFF when RSSI is less than -105dBm, flashing when in-between the -
95dBm and -105dBm, and ON when greater than or equal to -95dBm.
NOTE: the higher the negative number i.e. the further away from ZERO, the weaker the received signal.
The smaller the number i.e. the closer to ZERO, the stronger the received signal.
A flashing RSSI LED indicates potential need for an alternative antenna, relocating the
antenna to a site more suited to signal acquisition, or elevation of the antenna to improve
signal acquisition, or a combination of all the above.
A consistent RSSI reading of -95dBm or better [number closer to ‘0’] is advisable.
LED Label Description
pwr
Lit continuously when power is applied to modem
dtr
To indicate MODEM is live on Host device
sms
Blinks if there is unread SMS message
ri/rx
Blinks on incoming voice call, lights continuously on incoming data call,
blinks on data from PC to MODEM
tx
Blinks on data from MODEM to PC
rssi
Lights continuously in RSSI range > -95dBm (This is the preferred range)
Blinks in RSSI range -95dBm > -105dBm, (Signal is marginal)
Turn-off at RSSI < -105dBm (No signal available)
roam
ON when inside a preferred roaming carrier network but outside Telstra’s
network, FLASHES when inside a non-preferred roaming carrier network but
outside Telstra’s network, OFF when inside Telstra network
crt
To indicate connection in Circuit Switched mode
pkt
To indicate active connection in Packet Switched mode (OFF when in dormant
mode)
1x cell
To indicate that local cell supports Packet Switched data (OFF indicates cell
supports only IS95A)
Note 1: In ALL-LED-OFF state, when you connect ear piece to the MM-5100, the LED’s are enabled for a
value set by AT command AT$$EXT_LED=<1~255sec>. If LED always ON is required, change the
AT command parameter to ‘0’.
Note 2: If the LED’s have been disabled by AT command prior to power cycle, all LED’s will remain in
OFF state until ear-piece is connected.
