Transition Networks CGETF10XX-10X - Manual (Page 4)

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CGETF10xx-10x
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Operation - Continued
Link Pass-Through
The Link Pass-Through feature allows the media converter to monitor both the
fiber and copper RX (receive) ports for loss of signal. In the event of a loss of
an RX signal (1), the media converter will automatically disable the TX
(transmit) signal (2), thus, “passing through” the link loss (3). The far-end
device is automatically notified of the link loss (4), which prevents the loss of
valuable data unknowingly transmitted over an invalid link.
Full-Duplex network
In a full-duplex network, maximum cable lengths are determined by the type
of cables that are used. See pages 1 and 2 for the cable specifications for the
different CGETF10xx-10x models.
The 512-Bit Rule does not apply in a full-duplex network.
Half-Duplex network (512-Bit Rule)
In a half-duplex network, the maximum cable lengths are determined by the
round trip delay limitations of each Fast Ethernet collision domain. (A
collision domain is the longest path between any two terminal devices, e.g. a
terminal, switch or router.)
The 512-Bit Rule determines the maximum length of cable permitted by
calculating the round-trip delay in bit-times (BT) of a particular collision
domain. If the result is less than or equal to 512 BT, the path is good.
For more information on the 512-Bit Rule, see the white paper titled
“Collision Domains” on the Transition Networks website at:
www.transition.com
4 1
Media
Converter A
Media
Converter B
Near-End
Device
Far-End
Device
original fault
on the copper link
media converter B
disables the copper link
media converter A
disables the fiber TX link
3 2
media converter B
loses the fiber RX link
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SNMP
Use SNMP at an attached terminal or at a remote location to monitor the
media converter by monitoring:
• Copper and fiber link/receive status
• Hardware switch settings
• Receive error count
Also, use SNMP to enter network commands that:
• Enable/disable full-duplex and half-duplex advertisement
• Enable/disable Link Pass-Through
• Enable/disable Auto-Negotiation
• Symmetric pause
• Asymmetric TX (transmit) pause
• Asymmetric RX (receive) pause
• Disable pause
See the on-line documentation that comes with Transition Networks
FocalPoint™ software for applicable commands and usage.
Operation
Pause
The pause feature can improve network performance by allowing one end of
the link to signal the other to discontinue frame transmission for a set period
of time to relieve buffer congestion.
In Hardware mode, the pause feature can be set to
• Disable (i.e., no pause)
• Enable (i.e., symmetrical pause)
In Software mode, the pause feature can be set to one of four settings:
• Disable (i.e., no pause)
• Symmetrical pause
• Asymmetric TX (transmit) pause
• Asymmetric RX (receive) pause
Enable the pause feature if it is present on ALL network devices attached to
the media converter(s). Otherwise, disable the pause feature.