Functionality of Enterasys 1000BaseT Gigabit products

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Article ID: 4593 

Products
A2H124-24
A2H124-24P
A2H124-48
A2H124-48P
B2G124-24
B2G124-48
B2G124-48P
C1G124-24
C1H124-48
C2G124-24
C2G124-48
C2G124-48P
C2K122-24
ER16-GTX32-04
ER16-GTX32-08
SSR-GTX32-02
SSR-GTX32-04
V2G112-2
V2G121-1
VHIM1000-S1TX
VHIM-2GT-L3
VHSIM-G02
1G-2TX
1G582-09
5G102-06
5PIM-G02
6G302-06
GPIM-02
MGBIC-02 

Standards
1000BaseT
1000BaseTX
802.3ab 

Symptoms
Cannot change auto-negotiation state on gigabit port 

Cause
There are some basic functionality differences among the Enterasys Networks IEEE 802.3ab 1000BaseT products. This document explains those differences. 

Note that Flow Control is normally auto-sensing, for all devices, but as an option can be manually set. 

Further, in Part 3 Section 2 Clause 28D.5 Page 466 of the 802.3 Standards document, it states:
"28D.5 Extensions required for Clause 40 (1000BASE-T)
Clause 40 (1000BASE-T) makes special use of Auto-Negotiation and requires additional MII registers. This use is summarized below. Details are provided in 40.5.
a) Auto-Negotiation is mandatory for 1000BASE-T. (40.5.1)
b) ..." 

The reason auto-negotiation is mandatory is primarily due to the need to negotiate the Master and Slave clocking roles between the link peers. It is therefore not possible to hard-set Speed and Duplex settings for 1000BaseT ports running at a 1000Mb/s speed, though some products do permit control of advertised abilities. 

Solution
    Part            Speed       Duplexing        Settings

A2H124-24 10/100/1000 FD/HD auto/hard-set
A2H124-24P 10/100/1000 FD/HD auto/hard-set
A2H124-48 10/100/1000 FD/HD auto/hard-set
A2H124-48P 10/100/1000 FD/HD auto/hard-set
B2G124-24 10/100/1000 FD/HD auto/hard-set
B2G124-48 10/100/1000 FD/HD auto/hard-set
B2G124-48P 10/100/1000 FD/HD auto/hard-set
C1G124-24 10/100/1000 FD/HD auto/hard-set
C1H124-48 10/100/1000 FD/HD auto/hard-set
C2G124-24 10/100/1000 FD/HD auto/hard-set
C2G124-48 10/100/1000 FD/HD auto/hard-set
C2G124-48P 10/100/1000 FD/HD auto/hard-set
C2K122-24 10/100/1000 FD/HD auto/hard-set
ER16-GTX32 1000 FD unconfigurable
SSR-GTX32 1000 FD unconfigurable
V2G112-2 10/100/1000 FD/HD auto/hard-set
V2G121-1 1000 FD unconfigurable
VHIM1000-S1TX 10/100/1000 FD/HD auto/hard-set
VHIM-2GT-L3 100/1000 FD/HD auto-neg only
VHSIM-G02 1000 FD unconfigurable
1G-2TX 10/100/1000 FD/HD auto-neg only
1G582-09 10/100/1000 FD/HD auto-neg only
5PIM-G02 10/100/1000 FD/HD auto-neg only
5G102-06 10/100/1000 FD/HD auto-neg only
6G302-06 1000 FD unconfigurable
GPIM-02 1000 FD unconfigurable
MGBIC-02 1000 FD unconfigurable

10/100Mb can be hard-set, and 1000Mb advertisements can be configured, with Matrix E1 (1G-2TX, 1G582-09) f/w 2.03.07 or higher. 

See 4875 for more about 1000BaseT technology.
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