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PA-FE-FX to ONS E1000 Card

Does anyone know if this 7200 Fiber FE Adapter will work when plugged into a GBIC on the ONS E1000 card? I do understand that there will be a bottleneck, but I assume that this will not work due to the no-negotiating gbic and fe ports, is this correct.

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Re: PA-FE-FX to ONS E1000 Card

You are correct, this will not work.

Fast Ethernet fiber interfaces must connect to other Fast Ethernet fiber interfaces. And Gigabit Ethernet fiber interfaces must connect to other Gigabit Ethernet fiber interfaces. They expect to see signal modulation at their rated speeds.

There is no autonegotiating of speed and duplex on fiber interfaces, unlike copper 10/100 or 10/100/1000 interfaces. Fast Ethernet over fiber is always 100, although you can set the duplex manually. Gigabit Ethernet over fiber is always 1000 and full duplex (with Cisco's products, anyway).

The only way I can see you connecting a 7200 with that FE interface to a GE interface on an ONS is to put a Fast Ethernet media converter on it to get the FE signal into a copper format; then plug the FE copper feed into a switch; and have a GE interface on the same switch plug into the ONS's E1000. The switch will buffer communications between the two different-speed LAN interfaces.

A better solution would be either a 100TX interface in the 7200, patched into an ONS card with 10/100TX capability (if you have one); or a GBIC interface in the 7200, plugged directly into the ONS E1000 (if your 7200 will support a GE interface). If you go the GE route, make sure the GBICs at each end of the link are identical: SX to SX (850nm), or LX to LX (1300nm).

Hope this helps.

1 REPLY
Gold

Re: PA-FE-FX to ONS E1000 Card

You are correct, this will not work.

Fast Ethernet fiber interfaces must connect to other Fast Ethernet fiber interfaces. And Gigabit Ethernet fiber interfaces must connect to other Gigabit Ethernet fiber interfaces. They expect to see signal modulation at their rated speeds.

There is no autonegotiating of speed and duplex on fiber interfaces, unlike copper 10/100 or 10/100/1000 interfaces. Fast Ethernet over fiber is always 100, although you can set the duplex manually. Gigabit Ethernet over fiber is always 1000 and full duplex (with Cisco's products, anyway).

The only way I can see you connecting a 7200 with that FE interface to a GE interface on an ONS is to put a Fast Ethernet media converter on it to get the FE signal into a copper format; then plug the FE copper feed into a switch; and have a GE interface on the same switch plug into the ONS's E1000. The switch will buffer communications between the two different-speed LAN interfaces.

A better solution would be either a 100TX interface in the 7200, patched into an ONS card with 10/100TX capability (if you have one); or a GBIC interface in the 7200, plugged directly into the ONS E1000 (if your 7200 will support a GE interface). If you go the GE route, make sure the GBICs at each end of the link are identical: SX to SX (850nm), or LX to LX (1300nm).

Hope this helps.

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