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E-21
PacketStar
®
PSAX 4500 Multiservice Media Gateway User Guide
, Issue 2
Release 8.0.0
Appendix E PSAX Modules
4-Port Ethernet Module
The module provides services for bridging from an Ethernet LAN to an ATM
WAN using RFC 2684 MAC layer bridging and both PVCs and SPVCs. VLAN
Ethernet frames can be passed transparently by this module.
Software Features
The module supports the following software features. More information on
each feature is provided in the subsections that follow.
•
Four 10/100Base-T autosensing and autonegotiating ports
•
Bridging (RFC 2684)—Includes the encapsulation of the MAC layer data
for filtering (see the
PacketStar
®
PSAX 4-Port Ethernet Module Guide
for more
detail); supports up to four bridge groups
Note:
RFC 2684 supercedes RFC 1483, but only RFC 1483 aspects are
supported on this module.
•
Virtual channels per bridge group: 14
•
IP Forwarding
Note:
The IP Forwarding feature is not to be confused with the kind of
routing capability that supports virtual channel multiplexed routed
packets or LLC-SNAP.
•
ATM Traffic Shaping
•
LLC and VC Encapsulation
•
Multicasting
•
Spanning Tree algorithm (IEEE 801.1 Ethernet)
•
PVC connections—Up to 56 connections can be made per module
Hardware Features
The 4-Port Ethernet module provides the following hardware features:
•
Number of ports:
~
physical ports: 4
~
virtual port used for backplane connections: 1
•
Connector type: RJ-45
•
Total MTU: 1,522 bytes for an Ethernet packet excluding FCS and exten-
sion
~
Maximum data payload: 1,500 bytes excluding preamble/SFD/MAC
addresses/length
~
Ethernet header: 22 bytes (7-byte preamble, 1-byte SFD, 12-byte MAC
address, 2-byte length/type)
•
Total maximum transmission unit (MTU): 1,522 bytes for an Ethernet
packet excluding frame check sequence (FCS) and extension
~
Maximum data payload: 1,500 bytes excluding preamble/start frame
delimiter (SFD)/media access control (MAC) addresses/length
~
Ethernet header: 22 bytes (7-byte preamble, 1-byte SFD, 12-byte MAC
address, 2-byte length/type)
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