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ÔÚLinuxÏÂͨ¹ýPPPÉÏWCDMA

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/etc/ppp/peers/wcdma :
/dev/ttyACM0
460800
connect '/etc/ppp/chat-wcdma'
noauth
usepeerdns
noipdefault
defaultroute
----
×¢Ò⣬ÆäÖеÄ/dev/ttyACM0 ÊÇ´®¿ÚÉ豸£¬ºóÃæÃèÊö¡£
/etc/ppp/chat-wcdma
#!/bin/sh
#
# This is part 2 of the ppp-on script. It will perform the connection
# protocol for the desired connection.
#
exec /usr/sbin/chat -v \
ECHO ON \
ABORT 'BUSY' \
ABORT 'NO ANSWER' \
ABORT 'ERROR' \
TIMEOUT 20 \
'' 'AT' \
OK AT+CFUN=6 \
        OK              'AT+CGDCONT=1,"IP","3gnet",,0,0' \
OK 'ATDT*99#' \
CONNECT
ÆäÖеÄ3gnet ¾ÍÊÇÁªÍ¨WCDMAÉÏÍøÐèÒªµÄAPNÀ²¡£ CFUN=6ÊÇÈÃË÷°®MD-400Ö»¹¤×÷ÔÚWCDMAÍøÂçÏ¡£ÏàÓ¦µØCFUN=5¾ÍÖ»¹¤×÷ÔÙGSM/GPRS/EDGEÏ£¬ CFUN=1¾ÍÊÇÈ«×Ô¶¯Ñ¡Ôñ
²¦ºÅÁ¬½Óʱ£¬ÓÃ
              pppd call wcdma 
¼´¿É¡£Äã¿ÉÒÔ×Ô¼ºÉèÖÃIPαװNATµÈµÈÊÂÒË¡£
ÒÔÉÏÊÇÓÃË÷Äá°®Á¢ÐÅMD-400ÉÏÍø¿¨ÉèÖõģ¬Èç¹ûÄãÓõÄÊÇ»ªÎªE1750, ÄÇôÉ豸Ãû¾Í»»³É/dev/ttyUSB0 ¼´¿É¡£
ÎÞÂÛÊÇË÷°®MD400»¹ÊÇ»ªÎªE1750, ¶¼ÐèҪС¹¤¾ß usb_modeswitch 1.0.2 Çл»Æäµ¹Ã¹µÄUSB¹¤×÷״̬£¬ÏêϸµÄ½éÉܺÍÏÂÔØ¿ÉÒÔÈ¥ÕâÀï¿´¿´£º http://www.draisberghof.de/usb_modeswitch/ 
Èç¹ûÊǵçÐŵÄÌìÒíCDMA2000 EV-DO 3G, ²âÊÔÁËһϻªÎªEC1260£¬»ù±¾Çø±ð²»´ó£¬×¢ÒâÒÔϼ¸µã£º
1£¬ 2.6.19Ö®ºóµÄºËÐÄÓÐרÃŶԸ¶EC1260µÄ´úÂë, ²å½øÈ¥Ö±½Ó¾ÍÁîÆä¹¤×÷ÔÚModemģʽ£¬Äã»á¿´µ½ÓÐ/dev/ttyUSB0É豸£¬¿ÉÒÔ²»ÐèÒªusb_modeswitchµÄ°ïÖú¡£µÍ°æ±¾ºËÐÄ¿ÉÄÜ»¹Àë²»¿ª¡£
2£¬ EVDOûÓÐAPNµÄ¸ÅÄÉÏÃæµÄ/etc/ppp/chat-wcdma ½Å±¾¸Ä³ÉÕâÑù¼´¿É£º
[root@pxi4g ppp]# cat chat-evdo 
#!/bin/sh
#
# This is part 2 of the ppp-on script. It will perform the connection
# protocol for the desired connection.
#
exec /usr/sbin/chat -v \
ECHO ON \
ABORT 'BUSY' \
ABORT 'NO ANSWER' \
ABORT 'ERROR' \
TIMEOUT 20 \
'' 'AT' \
OK 'ATDT#777' \
CONNECT
Ò²¾ÍÊÇ˵£¬Ö±½Ó²¦ÌØÊâºÅÂë#777¼´¿É¡£ peers/wcdmaÎļþ¿ÉÒÔ²»¸Ä¡£
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Logical Link Control and Adaptation Protocol(L2CAP)
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