Classical Ip Over Atm (Clipoa); Ethernet Frames Over Atm (Eoa) - VeEX MTT-14B User Manual

MTT-14B e_Manual D07-00-083P RevA00

4.1.1 Classical IP over ATM (CLIPoA)

ATM
ATU-R
25.6
TCP
IP
AAL5
ATM ATM
ATM25
Figure 53 Classical IP over ATM
Classical IP over ATM is an IETF protocol which uses ATM's high
speed ability in the Local Area Network. It uses ATMF (ATM25.6)
physical interface over Twisted Pair Cable (per ATM Forum) to
interconnect in the LAN at the speed of 25.6 Mbps.
Classical IP over ATM reduces overhead by having IP and ARP
datagrams encapsulated in AAL5 using IETF RFC 1483 LLC/
SNAP encapsulation.

4.1.2 Ethernet Frames over ATM (EoA)

In this case, the Ethernet frames are encapsulated into the ATM
Adaptation Layer 5 (AAL5) using RFC 1483. The encapsulation
supports both routing and bridged. This is based on the standard
RFC 1483 'Multi protocol Encapsulation over AAL 5'.
Figure 54 shows a sample configuration of Ethernet over ATM
used in the field. In this case, IP address management can be
static with RFC 1483 Bridge encapsulation, dynamic with the use
of DHCP session management or it can use RFC 1483 Routed.
ATU-R
DSLAM
IP
802.3
1483
IP AAL5
ATM
802.3 ADSL ADSL
Figure 54 Ethernet over ATM
ATM-VC
ADSL
DSLAM
ATM
ADSL OC-3
ATM-VC B-RAS
IP Routing
1483
AAL5
802.3
ATM
OC-3 OC-3
LAN Media
ISP
TCP
IP
AAL5
ATM
ISP
WAN Media
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