Redhawk II GSM Modem Users Guide
Draft: 10/30/00
13
Part Number: 07100020 version 00B
© 2000 Xircom, Inc. All rights reserved.
All trademarks and copyrights are the property of Xircom, Inc.
Pin
Number
Signal
Name
Direction
Functionality
Voltage
Level
1
MIC0N
From CPE
Microphone Negative. Negative input pin from an electret-type
microphone. Nominal microphone differential voltage should be
2.0 volts. Impedance not less than 900 ohms. Leave signal
disconnected if function is not used.
2
SPK0N
To CPE
Speaker Negative. Negative output pin. Low side of a push-pull
amplifier. Speaker impedance 15 ohms, minimum. Speaker
capacitance of 700 pF, maximum. Driver voltage is 4.5 V
peak-to-peak. Leave signal disconnected if function is not used.
3
SPK0P
To CPE
Speaker Positive. Positive output pin. High side of a push-pull
amplifier. Speaker impedance 15 ohms, minimum. Speaker
capacitance of 700 pF, maximum. Driver voltage is 4.5 V
peak-to-peak. Leave signal disconnected if function is not used.
4
MIC0P
From CPE
Microphone Positive. Positive input pin from an electret-type
microphone. Nominal microphone differential voltage should be
2.0 volts. Impedance not less than 900 ohms. Leave signal
disconnected if function is not used.
Table 5: Voice Connector Pin Out
Subscriber Interface Module (SIM)
The SIM, an integral part of any GSM terminal device, is programmed with
subscriber information. The SIM is not provided with the Redhawk II unit and must
be provided by the GSM service subscriber. Care must be taken to protect the SIM.
A GSM terminal will not operate without the SIM installed.
The user information consists of an identity (IMEI number) registered with the GSM
provider, and an encryption Ki (pronounced key). The SIM consists of a
microprocessor chip and memory, installed on a plastic card. Redhawk II uses the
"mini-SIM" or plug in configuration. The SIM, which is removable, slips into a slot on
the front of the modem.
The SIM card performs authentication. To gain access to the GSM network, the
network must recognize the IMEI number and the terminal must be able to properly
decrypt the data sent by the network. The SIM also serves as a buffer for Incoming
and Stored SMS messages, or when a radio link is not available, store an outgoing
message until a network link is established.
Power must be off when installing or removing a SIM card.
Status Indication (STATUS)
The Redhawk II modem provides a multi-color LED that indicates the current link
status and signal quality.
Note:
The LED illuminates any time power is applied to the Redhawk II modem.