Sony Ericsson GM28, Руководство интегратора

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5. INSTALLATION OF THE MODEM
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LZT 123 7468 R1A
particular problem inside buildings, especially if the walls are thick
and reinforced.
• Multi-path fading is a sudden decrease or increase in the signal
strength. This is the result of interference caused when direct and
reflected signals reach the antenna simultaneously. Surfaces such as
buildings, streets, vehicles, etc., can reflect signals.
• Hand-over occurs as you move from one cell to another in the GSM
network. Your mobile application call is transferred from one cell to
the next. Hand-over can briefly interfere with communication and
may cause a delay, or at worst, a disruption.
5.5 Attachments
The GM28 has been FCC certified using a number of attachments
including:
1. AC-DC Power Adaptor with Customized DC Lead
(Model # AD-0901000BS)
Input 230Va.c., 50Hz, 2m mains lead
Output: 9Vd.c. 1A, 2m d.c. lead with RJ11 connector. CE marked.
2. Tri-band GSM Antenna (GSM/PCN/1.9GHz)
(Model # DG300-FME/F)
Covert fit spider patch antenna, self-adhesive pad, 0dBi, 2m RG174
cable with FME female connector.
3. RS232 9-way Serial Cable
(Model # C-E-RS232-2M)
2m, 9-way cable, DB9 (female) to DB9 (male) connectors.