Atm & Cpe Interfaces; Summary - Alcatel speed touch home Advanced User's Manual

14 Advanced Networking Concepts
14.1.3 ATM & CPE Interfaces
Note
ATMF 25
Ethernet
14.1.4

Summary

140 / 180
ATM traffic arriving at the Speed Touch Home is switched to
either the Ethernet interface or the ATMF 25 interface depending
on the VPI/VCI values in the individual cells.
ATM virtual channels can transport all forms of protocols.
However, at both endpoints - where the ATM channels are
terminated - the same protocol must be supported. If not, there
will be no end to end connectivity.
Not all STHome variants support two interfaces.
This interface does not terminate ATM connections, it just switches
ATM cells between the ADSL and ATMF 25 port. It is the ATMF 25
PC NIC that actually initiates or terminates ATM channels. It is
important to check in advance which protocols are supported by
the PC NIC driver. At least RFC 1483 and RFC 2364 should be
fully implemented.
This interface terminates a number of ATM connections and
extracts frames from arriving cells, and encapsulates frames in
departing cells.
Only frames recognized/supported by the STHome on
a particular ATM connection are extracted or encapsulated.
Currently the supported encapsulations are:
For Bridged connections:
"
RFC 1483, Ethernet V2.0/IEEE 802.3 bridged PDUs for both
the LLC/SNAP method and VC MUX method;
For PPP/PPTP connections:
"
RFC 2364, PPP PDUs for both the LLC/NLPID method and VC
MUX method;
Your ISP or corporate LAN administrator will provide you with
the following:
The VPI/VCI values of the virtual channels to which the
"
STHome is cross connected;
The protocols that are supported on these virtual
"
connections.
3EC 17096 AAAA TCZZA Ed. 01