Specifications
161
Pin
MDI signal name
MDI-X signal name
7
Bi-directional Data One Plus
(BI_D4+)
Bi-directional Data One Plus
(BI_D3+)
8
Bi-directional Data Four Minus
(BI_D4-)
Bi-directional Data Three
Minus (BI_D3-)
Cable testing for existing Category 5 cable
Installed Category 5 cabling must pass tests for Attenuation, Near-End
Crosstalk (NEXT), and Far-End Crosstalk (FEXT). This cable testing
information is specified in the ANSI/TIA/EIA-TSB-67 standard.
Additionally, cables must also pass test parameters for Return Loss and
Equal-Level Far-End Crosstalk (ELFEXT). These tests are specified in the
ANSI/TIA/EIA-TSB-95 bulletin, “The Additional Transmission Performance
Guidelines for 100 Ohm 4-Pair Category 5 Cabling.”
When you test your cable installation, be sure to include all patch cables
between switches and end devices.
Adjusting existing Category 5 cabling to run 1000BASE-T
If your existing Category 5 installation does not meet one of the test
parameters for 1000BASE-T, you can apply three measures to try to correct
the problem:
1. Replace any Category 5 patch cables with high-performance Category
5e or Category 6 cables.
2. Reduce the number of connectors used in the link.
3. Reconnect some of the connectors in the link.
Specifications
The tables in this section list the BES50 Series specifications.
Software features
Feature
Description
Authentication
Local, RADIUS, Port (802.1X), Port Security
Access Control Lists
IP
PoE
Power over Ethernet
Port configuration
10BASE-T: 100-ohm Category 3 or better twisted-pair
100BASE-TX: 100-ohm Category 5 or better twisted pair
1000BASE-T: 100-ohm Category 5, 5e, or 6 twisted-pair
Flow control
Full Duplex: IEEE 802.3x
Half Duplex: Back pressure
Broadcast storm control
Traffic throttled above a critical threshold
SMB
Using the Nortel Business Ethernet Switch 50 Series
NN47924-301
01.01
Standard
1.00
October 2006
Copyright © 2006, Nortel Networks
Nortel Networks Confidential
.
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