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New Member

ISDN and OSI layer

In ISDN, is switch-type (ex. basic-ni) making layer1 connection? And SPID make layer2? Dialer string for layer3? If yes, why layer3 use dialer number instead of IP Address? ISDN also use IP address to route packet, if IP is not in layer3 of ISDN, so where is IP?

3 REPLIES

Re: ISDN and OSI layer

look at this link...

it may help you...

http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/isdn.htm#wp1020605

rate this post if it helps

regards

Devang

Silver

Re: ISDN and OSI layer

Devang proposed link is good that ISDN layer is not the same as TCP/IP layer....

New Member

Re: ISDN and OSI layer

Also remember: the layering is based on the OSI _reference_ model. Reference being the operative word here. If you apply the same reference model to the PC world:

Layer-1 = electronics inside the PC

Layer-2 = BIOS/Firmware

Layer-3 = Operating System.

:P

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