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And what do they all look like? I assume some of these are located in the same buildings?

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A CO is a Central Office. It is the place where a Phone Company has its Switches. A class 5 CO produces Dial Tone for end users. Class 1-4 COs only provide trunking for other COs. A CO is the backbone of the Telephone Network.

A NOC is a Network Operations Center. Anyone can have one. When I worked for GTE we built the world's largest Private Voice Network for Westinghouse. They had a NOC. So did a lot of other private corporations and CLECs. NOCs are places where technicians monitor and oversee their Network.

A POP is a Point Of Presence. It's a locations where a Carrier has a connection to the main Network. If AT&T wants to connect it's Long Distance Trunks to Ameritech's Local Network it's connected at a POP.

A COLO is a COLOcation facility. A place where the LEC (phone company) has a connection to some other organization(s) - usually one or more CLECs. So if Sprint (for example) wants to sell Dial Tone to end users over Verizon's cable plant, they need a Colo.

POPs, & COLOs are usually in a CO. NOCs (unless they belong to the carrier) are usually someplace else.

These are obviously very brief basic descriptions. Ask away if you've got more questions.

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A COLO does not have to be telephone related. In the computer world, a COLO is a facility where you rent space (rack space, cage space) to place your equipment. A COLO can be anything from a storeroom at the back of your local mom-n-pop ISP where you can park a linux box, to multi-story datacenters.

A NOC can be anything from a PC or two sitting on the desk in the corner, to a multi-million dollar facility with multiple projection screens etc.
NOCs are used by many industries, including telecommunications, utilities, and network operators.

A POP can be anything from a bank of modems and a portmaster in a rented closet (to provide local dialup access), to large meet-me rooms at some of the internet exchange facilities.

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A colocation site can be either for voice, or more common, racks of servers kept offsite...


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I'll go out on a limb here and venture a guess this was a telecom question. :rolleyes: wink


Retired phone dude

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