Qualcomm MSM modem device
umsm* at uhub?
ucom* at umsm?
driver supports Qualcomm MSM modem
adapters. The MSM chipset is found in EVDO, UMTS and LTE capable modems.
Typically these are CardBus and PCI Express Mini Cards that incorporate a USB
controller with the actual device attached to it.
The following devices are known to work with the
Devices suspected of being compatible are:
Some modems have multiple serial ports, however almost all modems have only one
effective serial port for PPP connections. For example, the Huawei E220 has
two serial ports, but only the first port can be used to make connections; the
second one is for management. The Option GlobeTrotter HSDPA/HSUPA modems have
three serial ports, but only the last port can be used to make PPP
connections. The Medion Mobile S4222 has four serial ports, but only the first
port can be used to make connections.
Some modems require multi-link PPP operation. For example, the Huawei E1550 has
four serial ports. When initiating a connection, the control commands have to
be issued on the third port, and after that the actual PPP connection comes up
on the first port. The function of the second and fourth ports is unknown.
An example demand dial configuration for Cingular Wireless using
ABORT 'NO CARRIER'
'' ATZ OK AT&F OK
active-filter 'not udp port 123'
connect "/usr/sbin/chat -v -f /etc/ppp/cingular-chat"
# Secrets for authentication using CHAP
# client server secret IP addresses
firstname.lastname@example.org * CINGULAR1
is then started
# pppd call ac875
device driver first appeared in
driver was written by
and Yojiro UO
For Verizon Wireless (and possibly other services), cards require a one-time
activation before they will work;
not currently support this.
The additional IEEE 802.11 wireless chipset found in the Option GlobeTrotter GT
FUSION is not yet supported.