Parallel detection

CSRFB10xx-100

Operation -- Continued

Product features -- continued

Transparent link pass-through (TLPT)

TLPT notifies the end converter of a link failure by sending a link-loss signal over the fiber, instructing the terminal converter to shut down the copper port thus notifying the end converter. The fiber link between the two converters will be maintained.

•End converter automatically notified of link loss

•Fiber link remains up as it carries the link-loss signal

Operation -- Continued

Product features - continued

Per the IEEE method, an auto-negotiating port that detects a forced link partner should drop to the detected speed (10Mbps or 100Mbps) and default to HALF

DUPLEX.

Full duplex network

In a full duplex network, maximum cable lengths are determined by the type of cables that are used. See page 1 (front cover) for the cable specifications for the different CSRFB10xx-100 models.

Near-End

Device

Converter A loses copper RX link with end device

					Converter B		3
	Converter A				receives link loss		3
	sends a link loss			signal and disables
	signal over the			the copper TX port
			fiber
			fiber

Media		2			Media				Far-End
Converter A					Converter B	4			Device

								End device is
								End device is
								notified of link
									loss

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 converters, 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-line at: www.transition.com.

Far-end fault

When a fault occurs on an incoming fiber link (1), the media converter transmits a Far-End Fault signal on the outgoing fiber link (2). In addition, the Far-End Fault signal also activates the Link Pass-Through, which, in turn, disables the link on the copper portion of the network (3) and (4).

SNMP

See the on-line documentation that comes with Transition Networks FocalPoint™ software for applicable commands and usage.

Use SNMP at an attached terminal or at a remote location to monitor the media converter by monitoring:

Near-End

Device

Converter A disables copper link

Media

Converter A

Original fault on fiber link

Far-end fault signal sent

Media

Converter B

Far-End

Device

Converter B disables copper link

•	Media converter power
•	Serial and part number
•	Port number
•	Copper and fiber link status
•	Copper and fiber duplex mode

Auto-Negotiation

The Auto-Negotiation feature allows the CSRFB10xx-100 media converter to automatically configure itself to achieve the best possible mode of operation over a link. The media converter will broadcast its speed (10Mbps or 100Mbps) and duplex capabilities (full or half) to the other converters and negotiates the best mode of operation. Auto-Negotiation allows quick and easy installation because the optimal link is established automatically. No user intervention is required to determine the best mode of operation.

A scenario where the media converter is linked to a non-negotiating converter is a case where the user may want to disable Auto-Negotiation. In this instance, the mode of operation will drop to the least common denominator between the two converters (e.g. 100 Mbps, half duplex). Disabling this feature gives the user the ability to force the connection to the best mode of operation.

•	Copper port speed
•	Hardware switch setting
•	View terminal converter status
•	Set port ingress rate limits of the center side converter
Also, use SNMP to enter network commands that do the following:
•	Enable/disable Auto-Negotiation on copper
•	Force 10Mbps or 100Mbps on copper
•	Force full duplex or half duplex on copper
•	Force full duplex or half duplex on fiber
•	Enable/disable Transparent Link Pass Through

24-hour Technical Support: 1-200-260-1312 -- International: 00-1-952-941-7600

techsupport@transition.com -- Click the “Transition Now” link for a live Web chat.