Westermo U200 Operator manal - Manual (Page 11)

V4.5
www.westermo.com
U/R/T200 series
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Pair 2 RD + pin 3 <-------> Pin 1 TD +
RD - pin 6 <-------> Pin 2 TD -
Pair 3 TD + pin 1 <-------> Pin 3 RD +
TD - pin 2 <-------> Pin 6 RD -
Pair 4 pin 7 <-------> Pin 4
pin 8 <-------> Pin 5
4.6.5 Auto MDI/MDI-X
The complete range of Westermo OnTime switches automatically detects the transmit and
receive copper pairs used in a patch cable. This eliminates the need to source the two types
of patch cable (crossed and straight through) highlighted above and therefore reduces the
cost of carrying two types of spares.
4.6.6 Electrical Isolation
The copper (TX) ports incorporate high electrical isolation between the signal lines and the
internal electronics. In addition, the switch can also withstand over 500 Amps through the
shield for short periods of time (20-30mS) without effecting the operation and communication
of the Switch. However, this is not advisable. Fibre optical cables should be used in such
environments. Each TX port is isolated to chassis and other ports. Isolation is rated 1500Vrms
(1 minute).
4.6.7 Auto-Negotiation
Auto-Negotiation is a protocol that controls the speed and duplex of a copper cable when a
connection is established between two Ethernet devices. Auto-Negotiation detects the various
modes that exist in the device on the other end of the cable and highlights its own abilities to
automatically configure itself. Therefore, it will automatically operate at the highest
performance in relation to speed and duplex. This allows simple and automatic connection of
devices that support a variety of modes from a variety of manufacturers. The auto-negotiation
protocol only functions on copper ports.
As standard the range of Westermo OnTime switches are shipped with the Auto-Negotiation
feature enabled.
4.7 Fibre Optic Port Specification
4.7.1 Fibre Optic Communications
The fibre optic (FX) ports are available with either multi-mode or single mode fibre
transceivers. Multi-mode transceivers are available with MTRJ, SC or ST style connectors.
Single mode transceivers are only available with LC or SC style connectors.
Available fibre connector types are shown below: