It's more likely to reflect a hierarchy in the network (e.g. monomode span dropping down to multimode for the demarc). The telco just colocated their box on the subscriber's premises.
I don't buy it. You seem to be contending that the second NID is just a fancy transciever between fibers. But both boxes almost certainly have QSFP or some such, could input or output whatever fiber the job calls for. Quibbling about fiber types as an excuse for having two boxes seems absurd.
Your assertion also seems contested by the words in this post:
> Dispatch 5: NID #2 install. This is where I began to see the distinction between Verizon Telecom (VzT) and Verizon Business (VzB). While the layer 1 infrastructure had been installed and tested, there still remained the IP layer, which required another dispatch for another technician to install a dedicated NID for Verizon Business -- a Ciena 3903, with 1310nm single mode optics.
It does mention a different fiber connection, but to me, this is describing each layer of the stack having both it's own organizational unit & it's own physical box that it manages.
Two different companies, one provides the last mile, one provides the customer service layered on top.
It adds a lot of flexibility, for instance in this case the person was on-net for Verizon, but what if they were not? Then it wouldn't change at all, just the first NID would be a different provider than Verizon.
First "NID" is a Telco term of art, it's a contractual concern more than anything else.
The first device terminates the Fiber. It has an SPF transceiver in at for the wavelength the customer is getting the service on which is 1310nm. This is pure layer 1. A technician could/would use this "NID" to get a light reading during provisioning and/or troubleshooting. This is the end of the "local loop."
The second device is the one that provides Carrier Ethernet. Carrier Ethernet is like regular Ethernet but with some extensions that allow the provider "OAM"(operation, administration and management) capabilities. This is a layer 2 device.
I'm curious about this too.. it seems like it might be some intricacy because of Verizon business and Verizon telecom being two different entities, but I am curious if there is a technical reason for it too.
The guys on the ground and their dispatch are CWA unionized employees. The businessy guys are not.
Verizon is like a state or federal government agency. Massive complex bureaucracy that nobody really understands. As one of the ultimate legacy businesses they have all sorts of crazy settlements, agreements, tariffs, etc and segment their businesses around them.
