A SERVICE OF

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2-1
8000-A2-GB21-30
April 1998
Service Domain Features
2
Overview
This chapter describes the following features that are supported in the service
domain:
H Protocols
H Address Resolution Protocol (ARP) with Proxy ARP
H Filtering
Protocols
The Hotwire DSLAM and Hotwire RTUs forward IP packets between the end-user
system and the Network Service Provider using the following protocols:
H Point-to-Point Protocol/High-level Data Link Control (PPP/HDLC)
Packets transmitted over DSL links on an 8546 DSL card are encapsulated in
PPP/HDLC frames. PPP/HDLC is not supported on the 8540 DSL card.
H MAC
Packets transmitted over LAN ports are encapsulated in Ethernet II MAC
frames.
H IP
IP packets arriving over the DSL interface are forwarded to the LAN interface.
IP packets arriving over the LAN interface are forwarded to the appropriate
DSL interface.
NOTE:
Directed broadcasts
(also referred to as
subnet broadcasts —
all
1s (ones) in the host field) are forwarded upstream, but are not forwarded
downstream.
Multicast is not supported.