Protocol Support 2-19
Protocol Support
Async-Sync PPP Conversion
One of the most unique and powerful features of the
3Com Impact digital modem is its ability to convert
asynchronous Point-to-Point Protocol (PPP) into synchronous
(HDLC-based) PPP that can be transported in ISDN
B channels to communications servers and routers that have
integrated ISDN Basic Rate (BRI), Primary Rate (PRI), or
T1 access lines.
A wide variety of software and internetworking products has
been tested for interoperability with the 3Com Impact
digital modem’s Async-Sync PPP
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conversion software.
QuickSelect
The 3Com Impact digital modem supports V.120 and
Async-Sync PPP conversion. The digital modem uses a
technique called QuickSelect
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so that you do not have to
manually select the proper protocol for each ISDN call. With
QuickSelect enabled (the default), the digital modem
automatically detects and uses the required protocol.
