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Iridium Communications Inc.
9602 SBD Transceiver Product Developers Guide
Revision 5`
4.5 Radio Characteristics
Table 13 contains radio characteristics of the 9602/9602N SBD Transceiver.
Average Power during a transmit slot (max)
Receiver sensitivity (Typical level at module
Max Cable loss permitted (Note 1)
Note 1: Cable losses should be minimized. The total implementation loss for an antenna, connectors, cable,
lightening arrestor and any other RF component between the transceiver and the antenna should not exceed
3dB.
The total cable loss between the antenna and the modem includes losses in the motherboard.
Implementation loss higher than this will affect the Iridium link performance and quality of service. Solutions
with a loss higher than 3dB will not meet the requirements of Iridium Solution Certification.
Note 2: Link Margins are given assuming a free-space propagation model.
4.6 S-meter Performance
The numbers "reported over the AT command interface indicate the signal strength of the ring channel. Care
should be taken when using the S-meter readings for comparisons between devices. Of particular note are the
following:
1. There is a 0.5 dB tolerance on calibrating the S-meter.
2. Each bar represents a 2 dB increment
3. Multiple ring channels can be present at the same time so units can lock to different signals.
4. The Test Interface Card (TIC board) implementation adds about 0.6 dB loss in the antenna path.
5. If the reading is near the decision threshold it would be easy to see a 1 bar difference
5 AT Command Set Description
The 9602/9602N is configured and operated through the use of AT commands. See the "ISU AT Command
Reference" for the full set of AT commands and responses. For differences in AT command support between
9602/9602N software releases, see the relevant software release notes, which are made available to
authorized Iridium VARs and VAMs on the Iridium Developer Extranet. It is the responsibility of Product
Developers to check compatibility of applications software with the AT Commands on all 9602/9602Ns used for
both development and commercial deployments. See also the "Iridium Short Burst Data Service Developers
Guide" for information on how SBD operates on the Iridium system.
Proprietary & Confidential Information
Distribution of guide restricted to product developers only. • Information contained in this guide is subject to change without notice.
Table 13: Radio Characteristics
Parameter
connector)
Link Margin – Downlink (Note 2)
Link Margin – Uplink (Note 2)
9602 Value
9602N Value
1.6 W
1.6 W
-117dBm
-116dBm
2dB
2dB
13dB
13dB
7dB
7dB
32
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