Appendix D PSAX Module Features
Ethernet Interface Modules
D-26
255-700-447
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
•
LLC and VC Encapsulation
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Multicasting
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Spanning Tree algorithm (IEEE 801.1 Ethernet)
•
Maximum number of PVC connections per module: 120
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
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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 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)
•
Throughput:
~
Each port supports 10 Mbps (10BASE-T) or 100 Mbps (100BASE-T)
~
Maximum throughput: 294,118 pps (based on 64-byte packets, simplex
traffic flow, using two ports configured for 100 Mbps); the rate is approx-
imately 195 Mbps with zero percent loss
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235,000 frames per second (to and from the backplane), 64-byte packets
~
Theoretical maximum simplex rate: 297,620 packets per second (for two
100 Mbps ports using 64-byte packets)
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100% line rate (port-to-port) for up to three ports (64-byte packets)
~
75% line rate (port-to-port) for four ports (64-byte packets)
•
Measured latency range (when passing 90% traffic):
~
For 64-byte packets: 32 usec
~
For 1,472-byte packets: 72 usec
Note:
Performance results may vary depending on the bridge group con-
figuration and the number of ports configured.
•
Maximum number of connections per module: 120
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