ISDN Data Protocols

KlasDrive uses the CAPI interface provided by your ISDN card manufacturer to access a wide range of ISDN protocols. The set of protocols available to Klas Drive depends on the particular ISDN card installed, and can be viewed in the Protocol box of the KlasDrive setup.

When connecting to a system over the ISDN it is important to make the correct choice of protocol. The only way to be sure of the correct protocol to use is to find out from the operator of the remote service, but in general, if you are connecting to an Internet Service Provider (ISP) you should use PPP, if you are connecting to a Bulletin Board you should use X.75 or V.110 depending on the data rate the BBS will support.

 

X.75

  X.75 is a data link layer protocol defined by the ITU. It provides a means of reliably transmitting signalling information and higher level data between two Signalling Terminals (STEs). It was developed as a means of interconnecting two X.25 public packet-switched networks. It can also be used over the ISDN as a reliable means of accessing bulletin boards at 64kbit/s.

 

 

V.110

  V.110 is a rate adaption protocol for 64kbit/s ISDN channels. It allows the data rate to be reduced to rates used by many standard DTEs eg. 9600, 19200, 38400bit/s. Many older BBS and commercial teleservices opearate at rates slower than 64kbit/s and are often interfaced with the ISDN using V.110. If V.110 is supported by your ISDN card KlasDrive will supply you with a number of V.110 rate options.

 

 

PPP

  The Point to Point Protocol (PPP) is a defacto standard providing a method of encapsulating multi-protocol datagrams over point-to-point links. PPP comes in two main flavours, asynchronous PPP, which is frequently used in linking two machines over a modem, and synchronous PPP, which is used over the ISDN. KlasDrive provides PPP asynchronous to synchronous protocol conversion to allow standard Internet applications to use PPP over the ISDN.

 

 

HDLC

  HDLC is a physical layer protocol on the ISDN. It provides no error detection or flow control and is of limited use as a user data protocol. It is supported in KlasDrive as a diagnostic since a minimum of protocol processing occurs when it is selected.