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Client / Server
CSD 9600
CSQ / RSSI
SINAUT MD741-1
C79000-G8976-C236-05
In a client/server environment, a server is a program or computer that
receives queries from a client program or client computer and answers
them.
In data communication, a computer that establishes a connection to a
server (or host) is also referred to as a client. That means that the
client is the computer that is calling and the server (or host) is the one
being called.
CSD (9600) stands for Circuit Switched Data or dial-in data
connection. Here a connection is created between two users (end
points of the connection), similar to a telephone call over a public
telephone network. User 1 dials the telephone number of user 2. The
network signals to user 2 that there is a call, user 2 accepts the call
and the network establishes the connection until one of the users
terminates the connection again.
In a GSM network this service is called CSD, and allows data
transmission at 9600 bit/s or 14400 bit/s, with transmission being either
secured or unsecured. Possible connections are GSM modem to GSM
modem, analog modem to GSM and ISDN modem to GSM modem.
The CSQ value is a value defined in the GSM standard for indicating
the signal quality. CSQ values correspond to the received field
strength RSSI (= Received Signal Strength Indication):
CSQ
< 6
6...10
-101...-93 dBm
11...18
-91...-77 dBm
> 18
99
Not logged in
RSSI
< -101 dBm
> 75 dBm
Glossary
141
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