The optical world does have a well fit solution, in the form of optical line taps... I've never used the independent modules, but it's common to see them integrated into a MUX as a monitor port.
Quick search found this: https://www.showmecables.com/by-category/patch-panels/fiber-optic-systems/passive-optical-taps I'd contend this is better, as they start and end passive, avoiding a state change in a failure scenario. Although, un-networked devices in the middle of a circuit can become problematic if undocumented. The last thing you want is to be hunting down failed splices, when the answer is a loose connection in a datacenter. Probably good if you can have some type of networked monitoring platform in line with one of these. >From the sounds of it though, OP would need his device to be addressable via >one of the connections it is monitoring... and passive taps are >unidirectional. As far as optical networking goes, a passive solution would >require some type of multiplexing, which implies special equipment at midpsan, >A, and Z ends of the circuit. - Riley On Monday, June 23rd, 2025 at 9:41 AM, Kevin Shymkiw via NANOG <[email protected]> wrote: > > > I have seen several Fail To Wire (FTW) switches in the past. I never found > them to be worthwhile, personally for a few reasons > > - Only available in Copper. - You can't FTW optical since you need an OEO > conversion > > - Failure scenarios were limited - Our sites didn't have backup power, so > it was pointless as we would lose the rest of the gear as well > > Just my $.02 > > Kevin > > On Mon, Jun 23, 2025 at 9:34 AM Craig Smith via NANOG [email protected] > > wrote: > > > Hello, > > > > Is anyone out there aware of a fail safe switch/router/1U server where upon > > power failure or watchdog event 2 ports would fail to pass through > > data, but could also be assigned an IP address and act as a bridge in > > "normal" mode? The desire is to have an appliance that could perform > > monitoring and send telemetry in between a customer device and an Internet > > connection but not create a single point of failure or require multiple ISP > > handoffs. > > > > Best, > > > > Craig > > _______________________________________________ > > NANOG mailing list > > > > https://lists.nanog.org/archives/list/[email protected]/message/Y7JZATLRDCXOHWBH7NFGAQNSVJW2YTJA/ > > _______________________________________________ > NANOG mailing list > https://lists.nanog.org/archives/list/[email protected]/message/JEAZ47MKKDWILHHD3RLM6PV2HKE54HM3/
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