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Application Note: Ethernet Extender Performance

Overview

This is an application note explaining the performance of B&B’s Ethernet extender products. This application note covers two different types of Ethernet Extenders from B&B. One is the single pair copper wire extenders (EIS-EXTEND & EIR-EXTEND). The second is the coaxial cable extenders (EIS-EXTEND-C & EIR-EXTEND-C). Within each extender type of product there are hardened and industrial grade products but the engine and DSL profile used within each type is the same. This allowed us to perform the testing using one pair of extenders for single pair copper wire and one pair of extenders for coaxial cable.

Test Setup (Single Pair Copper Wire “Telephone Wire” Extenders):

We are surrounded by applications that call for creative communication and monitoring solutions. Increasingly, end users are searching for comprehensive solutions to applications. Whether adding remote I/O to a legacy PLC, extending analog and digital monitoring to a remote plant, or connecting serial devices without creating new hardwired links, industrial users want solutions that are simple to implement, reliable and cost-effective.

Diagram 1

The EIR-EXTEND units are connected to a SmartBits tester via 100 meters of category 5 Ethernet cable. The two EIR-EXTEND units are connected together using discrete lengths of standard telephone cable. The environment is a test laboratory. Why Wireless?

Test Setup (Coaxial Cable Extenders):

Diagram 2

The EIR-EXTEND-C units are connected to a SmartBits tester via 100 meters of category 5 Ethernet cable. The two EIR-EXTEND-C units are connected together using discrete lengths of standard coaxial cable (RG6). The environment is a test laboratory.

Test Parameters:

Mode: Single Burst (Approximately 3 minutes)
Packet Length: Random
Flow Control: Enabled

Procedure:

Transmit on all ports at the same time (full duplex)
Count Errors
Lost Packets
CRC Errors
Alignment Errors

Results:

The following table shows the results of testing a pair of EIR-EXTEND units with varying lengths of standard phone wire connected between them. The speed (bit rate) and distance are with values that yielded zero (0) errors during the 3 minute burst of packets.


Single Pair Copper Wire "Telephone Wire"
 
Speed
50Mbps
40Mbps
30Mbps
25Mbps
20Mbps
15Mbps
10Mbps
5Mbps
3Mbps
Cable Length
200m
500m
800m
900m
1,000m
1,100m
1,500m
1,600m
1,900m

The following table shows the results of testing a pair of EIR-EXTEND-C units with varying lengths of coaxial cable connected between them. The speed (bit rate) and distance are shown with values that yielded zero (0) errors during the 3 minute burst of packets.


Coaxial Cable
 
Speed
75Mbps
70Mbps
60Mbps
50Mbps
40Mbps
30Mbps
20Mbps
10Mbps
5Mbps
Cable Length
300m
700m
800m
1,000m
1,100m
1,600m
1,800m
2,300m
2,600m

Note: These tests were performed in a clean environment without extraneous noise sources and with new cable. Actual results in field conditions with aging cable may yield different results.