Netgear XM128 ISDN User Manual Page 43

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Async to Sync PPP 5-1
Chapter 5
Async to Sync PPP
This chapter describes the application of asynchronous to synchronous HDLC conversion.
Internet and Remote Access PPP and SLIP
More and more Internet Service Providers are offering their services through dial-up ISDN lines
for higher data bandwidth. The equipment used by your service provider frequently consists of
ISDN LAN routers which, unlike a digital modem, do not have asynchronous capability. For this
reason, terminal adapters that support only V.120 or asynchronous protocol do not work with this
type of equipment.
The Model XM128 modem converts the asynchronous data it receives from your computer to
synchronous format in order to communicate with ISDN LAN routers. We call this process
asynchronous to synchronous HDLC conversion or Async to Sync PPP (Point-to-Point Protocol)
or Async to Sync Serial Line Internet Protocol (SLIP) protocol.
Making Async to Sync PPP and SLIP calls
In order to communicate with an ISDN LAN router (from vendors such as Ascend and Cisco), set
the Model XM128 modem B channel protocol to one of the following:
ATB40<Enter> (
HDLC PPP
)
or
ATB41<Enter>(
HDLC SLIP
)
You should also set the DTE speed based on the bandwidth that the switches support.
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