XE3314C Просмотр технического описания (PDF) - Xecom
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XE3314C Datasheet PDF : 18 Pages
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Application Note: XE3314C Leased Line Operation
The XE3314C can support leased line applications. Because newer chipsets do not support automatic leased line
operation, the leased line handshake must be controlled by the local host.
Before attempting to establish the leased line connection, one modem must be defined as the originating modem and
one as the answering modem. The local host issues an ATD to initiate handshaking on the originating modem and ATA
to intiate the handshake on the answering modem. If the leased line connection is broken both local hosts must act to re-
initiate the handshake sequence.
No special configuration is required for leased line operation. Any modem configuration for error correction, data
compression, and flow control will work. Decribed below are some configuration options which may be beneficial in
your leased line application.
AT&C1 This command sets the operation of the Data Carrier Detect signal. With the &C1 setting Data Carrier Detect
becomes active whenever the modem detects a carrier signal and becomes inactive when that carrier signal
is lost. The local host can monitor Data Carrier Detect to determine if the leased line connection is intact.
AT+MS This command controls the modem handshaking options. It can be used to limit the modem handshake to a
particular speed or protocol. The +MS command includes four selectable parameters; modulation, automatic
fallback during negotiations, minimum accepted data rate and maximum data rate. Setting the maximum and
minimum data rates to the same value will require the modem to connect at only the desired data rate. The
format and codes for the +MS command are shown below.
AT+MS modulation, auto negotiation, minimum data rate, maximum data rate<ENTER>
Modualtion Type
V21 - V.21(300 BPS)
V22 - V.22 (1200 BPS)
V22B - V.22bis (2400 BPS)
V23 - V.23 (1200 BPS Half Duplex)
V32 - V.32 (9600 BPS)
V32B - V.32bis (14,400 BPS)
V.34 - V.34 (33,600 BPS)
B103 - Bell 103 (300 BPS)
B212 - Bell 212 (1200 BPS)
Auto Negotiation
0 - Automode disabled
1 - Automode enabled
Minimum Data Rate
or
Maximum Data Rate
300 - 300 BPS
1200 - 1200 BPS
2400 - 2400 BPS
4800 - 4800 BPS
7200 - 7200 BPS
9600 - 9600 BPS
12000 - 12,000 BPS
14400 - 14,400 BPS
16800 - 16,800 BPS
19200 - 19,200 BPS
21600 - 21,600 BPS
24000 - 24,000 BPS
26400 - 26,400 BPS
28800 - 28,800 BPS
31200 - 31,200 BPS
33600 - 33,600 BPS
XECOM
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XE3314C
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