METRODATA NetTESTER FAMILY USER MANUAL
76-02-107 Rev.A
Page 60 of 133
Half
Advertise Half Duplex
Full
Advertise Half Duplex, Full Duplex
14.1.2.3 Auto Negotiation
Menu Tree: Main Set-Up /
S
ettings /
W
AN Port /
A
uto-Negotiation
Auto Negotiation allows the port to automatically determine the best operating
parameters for the port. If both link partners support auto-negotiation then they will
select the best mode that is supported by both devices.
If one link partner does not support auto negotiation, an auto negotiating link partner
will be able to determine the link speed, however it will be unable to determine the
duplex mode so will default to the half-duplex state.
An auto port connected to a non-auto port is a very common fault on networks
leading to errors on the line when significant traffic is flowing but appearing to
operate normally when diagnostics like ping are used to test the link.
Note, Auto-Negotiation is mandatory in 1000M mode so cannot be disabled unless
the speed selection is either 10M or 100M.
14.1.2.4 Negotiated
Menu Tree: Main Set-Up /
S
ettings /
W
AN Port / Negotiated
When auto negotiation is enabled, the negotiated display item shows the operating
mode that has be negotiated between the link partners.
10M/HD
10 Base T / Half Duplex
10M/FD
10 Base T / Full Duplex
100M/HD
100 Base T / Half Duplex
100M/FD
100 Base T / Full Duplex
1000M/HD
1000 Base T / Half Duplex
1000M/FD
1000 Base T / Full Duplex
14.1.2.5 MDI / MDIX
Menu Tree: Main Set-Up /
S
ettings /
W
AN Port /
M
DI/MDIX
There are two possible pin outs for the RJ45 physical ports, one is defined as MDI
and is typical
ly found on data sources such as PC’s or Laptops. The other is defined
as MDIX, or MDI Crossover is typically found on switches. In order to use a straight
through patch cable, an MDI port must connect to an MDI-X port otherwise crossover
cables are required.
