G. Diehl ISDN (EICON) WAN Miniport Driver for Windows NT
  ========================================================


Contents
--------

  1 Overview
  2 Hints for configuring shorthold mode
  3 Using 56 kBit lines
  4 Release notes
  5 Registered trademarks
  6 Copyright


1 Overview
----------

  The  following text provides information for the installation
  and use of the G.Diehl ISDN (EICON) WAN Miniport Driver which
  has  changed or has been added since the time when the manual
  was printed.

  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  !     Please always refer to the printed manual first!      !
  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


2 Hints for configuring shorthold mode
--------------------------------------

  The term shorthold mode stands for a mechanism which helps to
  save  charges  by  disconnecting the physical ISDN connection
  automatically  after  a  certain time of inactivity. While in
  shorthold  mode  the  network  connections  remain  logically
  active  and  when  new  data  has  to be transmitted the ISDN
  connection is set up again automatically.

  To  make  the  shorthold  mechanism work it is necessary that
  your  switch supports calling line identification (that means
  that  the phone number of the calling station is delivered by
  the switch together with the incoming call).

  Some  additional  rules  are important to make shorthold mode
  work correctly:

  You should configure the RAS server as follows:

  - the  server  should  accept  shorthold  requests  from  the
    clients,  but  it  should  not  issue shorthold requests by
    itself.  That  means  that  you  have  to  check the option
    'Shorthold Mode', but the parameter 'Shorthold Time' has to
    be  set  to 0 seconds (which means no shorthold requests at
    all).

  - you  should  not  assign  (different)  multiple  subscriber
    numbers (MSN) to the RAS ports.

  - if  the  phone  numbers  delivered  by the switch cannot be
    called  back,  e.g. because the prefix for an outbound call
    through a PBX is missing, you have two options: you can use
    the  'Number  Checking'  facility  to  configure  the right
    callback  number  for each client (refer to the manual), or
    you  can use the parameter 'Callback Prefix' to configure a
    global  dialout  prefix  for all clients. You can check the
    phone numbers delivered by the switch and the phone numbers
    which  are  used  for  dialing out with the help of a DILOG
    trace (entries "Called by xxx" and "Calling xxx").

  - if  the  RAS  server  is  also temporarily used as a client
    together   with   Multilink-PPP   and  RAS-Callback  and/or
    shorthold mode you should use dedicated RAS ports for that.
    These  RAS  ports  have  to  be  configured  with  multiple
    subscriber  numbers  (MSN)  which have to be different from
    each other and from the phone numbers of the ports used for
    the RAS server.

  You should configure the RAS clients as follows:

  - they should trigger the shorthold mode, that means you have
    to  check the option 'Shorthold Mode' and set the parameter
    'Shorthold  Timeout'  to  a  value  which is different from
    zero.

  - if  Multilink-PPP is used (that means two or more RAS ports
    are  bundled  for a connection to the same RAS server), you
    have to assign different phone numbers to these ports.


3 Using 56 kBit lines
---------------------

  Support  for ISDN lines with a link speed of 56 kBits has now
  been added.

  The  speed  of  incoming  calls  is  detected  automatically.
  Outgoing calls use a link speed of 64 KBit by default.

  To  make  a  call with a speed of 56 kBit you have to add the
  letter  'a'  or  'A'  to  the  phone number. E.g. to call the
  number  '123456'  using  a  link speed of 56 kBit you have to
  enter '123456a' in the RAS phonebook.


4 Release notes
---------------

  Version 1.02: Beta version

  Version 1.03: Initial release version
    Beta  versions  can  be  updated  by executing the function
    "Update" for the WAN Miniport driver. After this you should
    check the configuration of the driver.

  Version 1.04:
    The  G.Diehl-ISDN  components  that were installed with the
    function  Add  Adapter...  have  been  moved  to  the  root
    directory of the installation diskette. As path you can now
    simply  type  "A:\" instead of "A:\adapter". Please perform
    the update operation for the WAN Miniport driver to move to
    the new version.

  Version 1.05:
    - ISDN protocols for the US have been improved.
    - Support for Windows NT 4.0 Beta (SUR) has been added.
    - Support for 56 KBit lines has been added
    - Improved shorthold mechanism (MSNs no longer necessary)
    - Changed   configuration  (Parameters  NetworkAddress  and
      NoAnswerTimeout removed, CallbackPrefix added)


5 Registered trademarks
-----------------------

  'Windows   NT'   is   a  registered  trademark  of  Microsoft
  Corporation.


6 Copyright
-----------

  Copyright (c) G.Diehl ISDN GmbH (EICON Technology) 1995-96