| 摘要 |
An interface (66) between a dual mode mobile station (60) and a piece of dat a terminal equipment (64) supports both a logical digital interface (66(1)) and a logical analog interface (65(2)), with the analog interface passing through a modem. At set-up of either a mobile originated or mobile terminated data/fax call, a supporting dual mode communications network (62) determines whether n digital traffic channel (52) is available on an air interface. It so, the channel is allocated to the mobile station, and data/fax communication with the data terminal equipment occurs using the logical digital interface. Otherwise, an analog voice channel is allocated, and the data/fax communication with the data terminal equipment occurs using the logical anal og interface and modem. Within the supporting network, data/fax communications via the digital traffic channel are routed through a n interworking functionality (72) that terminates a radio link protocol utilized for communicating aver the digital air interface. Analog voice channel data/fax communications are instead routed through a modem pool (70) that terminates a selected modem protocol utilized by the modem for communicating over the analog air interface.
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