SQ864
GPRS Terminal
9
Sales: +44 (0) 118 967 9000
Fax: +44 (0) 118 976 9020
www.sequoia.co.uk
Rev 2.1.4 Jan 2011
Wireless Technology
Experience The Freedom
5.6 SIM Socket
A standard SIM socket is provided which accept 1.8V/3V SIM card for carrier subscription.
5.6 SIM Socket
A SMA connector is provides to allow connection of a passive or active antenna. For optimum performance the antenna assembly
connected to this device is required to have the following characteristics:
•
Specified designed operation in the following bands :
•
GSM 850/900 MHz
•
GSM 1800./1900 MHz
•
The characteristic impedance on any antenna or cable assembly attached to this device should be 50R
•
The antenna must be capable of handling a minimum of 2W output power
•
The VSWR should be less than 3:1 to avoid damage to the device.
5.7.1 Antenna placement
When in service the antenna should be placed away from electronic devices or other antennas. The recommended minimum distance
between adjacent antennas, operating on a similar radio band, is at least 50cm.
5.7.2 Antenna connection cable
If a cable is used to connect the device to the antenna this cable must be a high quality low loss cable. The cable and any connectors used
should have 50R impedance.
Pin No.
Name
Usage
Description
Voltage Level
1
SIM_VCC
Power supply for the SIM
Data Carrier Detect
+/- 5.4V
2
SIM_RESET
Output – Resets the SIM
Received data
+/- 5.4V
3
SIM_CLOCK
Output – Clock signal for clocking data I/O
from the SIM
Transmit data
+/- 25V
5,10
SIM_GND
0V
Data terminal ready
+/- 25V
7
SIM_IO
Data I/O signal for the SIM
Request to send
+/- 25V
9
SIM_IN
Input – Detects the presence of SIM card in
the connector
Clear to send
+/- 5.4V
