Public bug reported:
I've tried four 3G modems with 10.10 ubuntu distribution. Two of them
are HSDPA while two of them are HSUPA. Following are the models.
modem 1: Huawei E156G, HSDPA
modem 2: Huawei E143, HSDPA
modem 3: Huawei E220 HSUPA
modem 4: Option Icon 431 HSUPA
When i connect through HSDPA modems, everything is fine. The connection was
stable and i always got an upload speed around .1Mbps. (checked through
speedtest.net). However when i connect through a HSUPA modem, the connection
showed following problems.
1. upload speed is .05Mbps, which is half what i get with HSDPA modem.
2. connection is not stable. it gets disconnected often. just after a
disconnection, if i retry it works.
2. speed continue to reduce during the lifetime of the connection. Just after
connection, it gives a good speed, but gradually reduces to a point where i can
no longer do any useful work. If i try to load a page in the browser at such a
time, i see the message "sending request" in the status bar of the browser for
long time. It seems like the modem has problems sending data to the signal
tower. The average signal strenghth i get is 32%. The modem heats up a lot when
connection is live.
All these made me think that this could be due to insufficient power to
the modem. I think HSUPA need more power to keep the higher upload
speed. In fact, the modem 3 (huawei E220) has two cables to plug in to
USB to draw more power.
here are few other detail that might be useful.
i mostly used the wvdial with following config.
#Modem=/dev/ttyUSB0
Modem=/dev/ttyHS3
Baud= 460800
Init = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ISDN = 0
Modem Type = USB Modem
Phone = *99#
Username = s
Password = s
stupid mode = 1
New PPPD = yes
i have used usbmode_switch package for plug and play support.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/702969
Title:
connections started with HSUPA modems are unstable
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