
ATM Half-Bridge Overview
300017-A Rev. 00
1-3
Figure 1-1. DSL Network with an AHB Router
The following steps explain how IP packets travel from the CPE host (remote
user) on an Ethernet segment to the AHB router located at the public network
provider’s central office:
1.
A user (PC or workstation) at a remote site sends Ethernet packets to an
ATU-R attached to a remote Ethernet LAN segment (10 MB).
2.
The ATU-R, acting as an Ethernet/ATM bridge, performs the following tasks:
• Accepts the Ethernet packets
• Segments the Ethernet packets into ATM cells according to RFC 1483
(802.2/LLC bridge encapsulation)
• Transmits the ATM cells to a DSLAM ATU-C at the public network
provider’s site
3.
The ATU-C receives the ATM cells, which are multiplexed along with cells
from other ATU-Cs, and transmits them to the ATM network over one or more
OC-3 links.
BLN/BCN
router
AT M
A
DSLAM
DSLAM
ATU-C
M
U
X
ATU-R
IP
ATM
Frame relay
ISP1
Corp1
ISP2
Corp2
ATM
over
DSL
OC-3 link
PC2
PC1
1483 encapsulated IP
packets in ATM
Frames
IP
802.3
IP
802.3
AAL
ATM
IP
802.3
AAL
ATM
IP
Remote
customer premises
WAN
infrastructure
ISP or
corporate network
Network provider
central office
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