Transition Networks CGETF10XX-10X specifications Link Pass-Through, Full-Duplex network, Pause

CGETF10xx-10x

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.

	media converter A				media converter B
	disables the fiber TX link			loses the fiber RX link
			2	3
Near-End		Media				Media		Far-End
Device	1	Converter A				Converter B	4	Device
original fault							media converter B
on the copper link						disables the copper 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

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.

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.

6 24-hour Technical Support: 1-800-260-1312 International: 00-1-952-941-7600 techsupport@transition.com -- Click the “Transition Now” link for a live Web chat. 7