求教，中兴3g上网卡掉线的问题，型号AC582

stitchwillow

  N- K- N5 O2 g配置如下：
9 X9 _9 J& O+ y3 V6 v1 alsusb内容：
2 T: e: k( ~9 r; @Bus001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus001 Device 002: ID 0424:9512 Standard Microsystems Corp.
Bus001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
3 s2 H' A2 B; m; P! RBus001 Device 004: ID 1a40:0101 Terminus Technology Inc. 4-Port HUB
. x3 D7 ?4 v! RBus001 Device 005: ID 148f:3070 Ralink Technology, Corp. RT2870/RT3070 WirelessAdapter
Bus001 Device 006: ID 04b3:3025 IBM Corp. NetVista Full Width Keyboard
' q% L* [) ]7 i( J( j( [6 K, c# WBus001 Device 009: ID 19d2:0152 ZTE WCDMA Technologies MSM
  W/ k2 `. `$ s/ o! g1 v
$ T2 U* D  ^- wvi /etc/usb_modeswitch.conf
  l$ S1 I3 n% }0 [; K9 k* y将里面内容改为：
DisableSwitching=0
DefaultVendor= 0x19d2
/ x. o" w# _7 {DefaultProduct= 0x0026
/ ~5 E- ^# c4 c# I+ E: qTargetVendor= 0x19d2
3 l* x, b5 I# O/ iTargetProduct= 0x0152
) p/ Q! S& p5 a' P8 b" \MessageContent="5553424312345678240000008000061b000000020000000000000000000000"
CheckSuccess=5
" `4 U. A. u6 N: P  hHuaweiMode=0

  N4 W3 Q8 H8 D运行usb_modeswitch -W -c /etc/usb_modeswitch.conf

& o# G0 _' ~3 b/ }0 n8 H. x2 U: Mvi /etc/wvdial.conf
内容为：
/ R/ Z* k. h& Q( C[Dialer 3g]
Init1 = ATZ
4 W5 G8 a. q" k8 I$ T( o4 z0 dInit2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Stupid Mode = 1
2 k7 p& ]" p- R8 ^/ TModem Type = Analog Modem
9 S  x/ o7 H, `4 x1 A* V+ S/ Z9 PISDN = 0
% n- l* m; G9 C+ p2 F6 i: PNew PPPD = yesPhone = #777
Modem = /dev/ttyUSB0
Username = ctnet@mycdma.cn
5 D1 x" E5 _3 \- zPassword= vnet.mobi

wvdial 3g拨号正常上网。
时间久了不定时掉线
掉线提示：A modem hung up the phone (exit code 16)

% q/ s6 e5 |) f/ Idmesg 显示多出如下信息：
[28924.835673] option1 ttyUSB0: option_instat_callback: error -108
8 {: C- G) A# z9 f' A[28924.847101] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[28924.847266] option 1-1.3.2:1.0: device disconnected
[28924.851020] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
' b0 u+ A" n+ g3 l* h7 t# w[28924.851128] option 1-1.3.2:1.1: device disconnected
" @9 j  D( I, {. _$ O$ v* t[28924.851505] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[28924.851594] option 1-1.3.2:1.2: device disconnected
/ N3 {1 F1 Y* {/ `4 L4 D9 d[28924.851922] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[28924.852071] option 1-1.3.2:1.3: device disconnected
[28924.852471] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[28924.852564] option 1-1.3.2:1.4: device disconnected
[28924.947089] usb 1-1.3.2: reset full-speed USB device number 6 using dwc_otg
/ y8 V) B7 u- O[28925.027054] usb 1-1.3.2: device descriptor read/64, error -32
[28925.158316] usb 1-1.3.2: USB disconnect, device number 6
[28925.470122] usb 1-1.3.2: new full-speed USB device number 9 using dwc_otg
, |: Q  C& o. P2 L1 }5 U[28925.592934] usb 1-1.3.2: New USB device found, idVendor=19d2, idProduct=0152
" ^. m9 }) a; X8 d# `/ C3 L[28925.592966] usb 1-1.3.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[28925.592984] usb 1-1.3.2: Product: ZTE CDMA Technologies MSM
' U& ]3 L) `# c2 m[28925.592999] usb 1-1.3.2: Manufacturer: ZTE, Incorporated
* m8 e, m3 U; p1 i) v' M0 D[28925.600518] option 1-1.3.2:1.0: GSM modem (1-port) converter detected
" j& n0 F+ U6 U; Q0 d[28925.601158] usb 1-1.3.2: GSM modem (1-port) converter now attached to ttyUSB0
[28925.603503] option 1-1.3.2:1.1: GSM modem (1-port) converter detected
[28925.603999] usb 1-1.3.2: GSM modem (1-port) converter now attached to ttyUSB1
" s/ p  @( B, Y$ z1 S
在掉线以后再用wvdial 3g拨号则会出现如下情况：
--> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATZ
; r! _* T% o" `--> Sending: ATQ0
--> Re-Sending: ATZ
--> Modem not responding.
4 [" J6 _6 `# i  E8 g, q4 O" U无法拨号

拔掉3g上网卡再重新插上，重新拨号又可以正常上网，求教一下3g上网卡掉线提示是什么意思，该如何解决。
本人刚入论坛不久没法给出多余金币望见谅。