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ISDI, a NDIS-2 Driver for ISDN-API 1.1
Herbert Hanewinkel, Sept 1995
ISDI is a (realmode) NDIS-2 Driver for IP-Routing or remote
Ethernet bridging over ISDN. ISDI communicates with the ISDN card
using the ISDN API 1.1 specification (a standard defined by
German ISDN card manufacturers and the German Telekom). Because
of this, ISDI is completely hardware independent and has
successfully been tested with many active or passive ISDN cards.
ISDI was developed for Internet access over ISDN from WfW 3.11
and MSTCP-32. ISDI has successfully been tested with Win95 beta
releases. ISDI is also known to work with other NDIS based TCP/IP
packages for DOS and Windows, e.g. ChameleonNFS.
ISDI can be used with standard DOS CAPI 1.1 software or VxD
implemenations of the CAPI 1.1 software. Using a VxD CAPI
implementation, ISDI is available only under Windows but it frees
a lot of DOS memory otherwise used by the CAPI software.
ISDI supports a large set of protocols for communication with
other vendors ISDN routers or servers. Among these protocols are:
LAPB, Frame-Relay, PPP, SLIP, Cisco-HDLC.
Some protocols conserve the protocol type over point-to-point
lines (multi-LAPB, Frame-Relay, Cisco-HDLC). These protocols are
able to handle multiprotocol routing. For PPP only IP support is
implemented at the network configuration layer.
ISDI can communicate at least with the following commercial
systems:
Ascend Routers, AVM MPR 3.0, Biodata ISDN Router, Cisco
Routers, Conet S2M Router, INS/CLS Banzai ISDN Router, netCS
ISDN Router, RzK SLIP Bridge, SGI Indy ISDN 1.0 & 1.1, Spider
Routers, SunLink ISDN 1.0 & 1.0.2.
ISDI is a MS-DOS TSR program for use with TSR or VxD CAPI 1.1
implementations.ISDI was written for use with ISDN BRI PC cards.
I got responses from users of ISDI that it will work at least
with the following other ISDN cards:
AVM A1, B1
Creatix S0/16
Diehl Diva, Quadro, SCOM, S0Tec
Elsa ISDN/PCF, Elsa PCC-16,MicroLink
ITK
Loewe ISCOM C100
MIRO connect P1000
mbp Solis
NCP P8, P16, A
Dr. Neuhaus NICCY 1000 PC
RFI HOTISDN ISDN-PCMCIA-Controller
Sedlbauer S0, SpeedBox par. Port, PCMCIA Adapter
Teles.S0/8, S0/16, Teles PCMCIA
(Check for a related *.txt file in ftp.biochem.mpg.de/pc/isdn, if
you are looking for details on a specific environment).
The current version of ISDI supports two independent active
connections at a time. Alternativly a connection can use both B-
channels for loadsharing. ISDI can be loaded more than once, if
more than two simultaneous connections to different sites are
desired. Loadsharing can be configured as static or dynamic
(bandwidth on demand). Dynamic loadsharing can be used
concurrently with a second independent connection.
Loadsharing over two channels is implemented using simple round
robin scheduling, because IP doesn't require the original packet
sequence. This is completely hardware independent and supported
by many router systems. It works the same way as Cisco implements
loadsharing over to X.21 interfaces and I have tested ISDI with a
Cisco Router and two Philips TA's. With this kind of loadsharing
it is possible to get a performance of up to 13 kBytes/s.
The latest version of ISDI is available on ftp.biochem.mpg.de in
directory /pc/isdn.