Hello!

I have a CIX670 that uses multimode fiber to connect to it's "daughter" cabinets in other buildings. We have run new singlemode between buildings and I was considering trying to find a way to connect the PBXs to one another using a fiber-fiber transceiver, convert it to from multimode to singlemode and back again. Most transceivers seem to be protocol specific, with Ethernet being the most prevalent (in my world). I can't find anything on the RRCU1 card that specifically states if it uses Ethernet or not. PBXs aren't really my forte....googling around I've also found mentions of it possibly being SONET....or something completely proprietary.

Can someone who actually knows these systems tell me if it's Ethernet? Or if there is a common way to connect these over singlemode without making any changes to the PBX hardware itself?

Thanks in advance.

This reminds me of a time when I was asked by our customer's IT to extend the T1 circuit over fiber using fiber to Ethernet converts. T1 and Ethernet don't even use the same cable pairs, much less the same data format! I believe they eventually got the correct converters for T1.

Anyway, I would have almost t guaranteed that Toshiba didn't use Ethernet for the RRCU1 connections. After looking in the install guide, I am now 100% sure. The transmission speed of the connection is 155.52 Mbps. This would match the speed of an OC-3 circuit. Best guess if they used SONET, ATM, or just something else. It wouldn't be the first time that they used a proprietary protocol,

Unless you could find a converter that can pass the light as-is, I suspect that your won't have much luck with SM-MM converts for Ethernet.