Just like the title says, I know it is basically a dry pair from telco from point a to point b.

I have a guy that just started working with me and he is a fanatic about knowing what every acronym stands for, well he stumped me with this one and I hope some of the more experienced people here can shed some light on this for me?

OSN = Operations System Network
OSNA = ?

Going to move this to "Telephone Service".
I assume you talking circuit ID. OS type services were a basic voice circuit the last two letters usually defind LS,GS,RD or what every type it was. Since I no longer have the books to look these up can't tell you what NA was and I've never really seen it, OSNC was the most common. Maybe one of our CO guys will know. Also the OS was the Long Haul ID not the local or LEC ID. If your not talking about a circuit ID then I'm not sure what you're talking about.

I took a look at Newton's Telecom Dictionary. No listing for OSNA. The only listing is OSN which is what Rhonda mentioned.

I don't think it's an acronym I'm pretty sure it's a circuit ID like DHEC xxxxxx OSNC xxxxxx poster stated he though it was a dry pair.

I agree with Bill. Verizon identifies dry pair or OPX circuits with OSNA-XXXXXX.

OK OSNA was the (old) circuit identifier for an off premise extention. So your right dry pair. It's a circuit identifier not an acronym.

I saw a diagram with some Verizon circuit IDs in the following format: XXX.OSNA.XXXXX

Yes my mistake you guys are correct it is the circuit ID.
For example: 12OSNA345678

That would make more sense...Something like 95/OSNA/123456/NE.

Everything you ever wanted to know (and then some) is listed below… I typed the Common Language Coding information out a couple years ago to help eliminate some Service/NC/NCI coding confusion we were having here.

OS= the 3rd and 4th position of a circuit code. This is called the Service code.
N=5th position modifier to the service code.
A=6th position modifier to the service code.
The 5th and 6th position modifiers to a circuit ID are in general user for billing and or tariff type information. In you specific example I think that NA actually means “NA or not applicable” for this service.


SVC code: OS
Sec NCI code: 02LS2. . (Loop start 2-wire)

Service code OS:
An Off Premise Extension (abbreviated OPX or OPS) is an extension of a customers PBX or key-system. This would allow a for a desk-set or office phone to be placed at a remote location from where a customers PBX is located but operate as though it’s there in the within the same building.

NC code UC:
Voice Grade 32 (VG32) service. VG32 is considered a “building block” type of channel and is generally thought of as a “basic line” class of service. 3rd and 4th character selections of the NCI code can allow for many sorts of enhancements, conditioning levels and functions.

For a basic OPX UC-- would be a sufficient NCI code with no further option selections needed.

Primary NCI codes for OPX:
For an IntrA-LATA Off Premise Extension where no other Telco’s are involved (non-meet point) the PRI-LOC (A-End) would be the customers PBX. The NCI code listed for the PRI-LOC would need to reflect a few things about the PBX itself. Things to be conveyed by the NCI about the PBX would be number of wires to the port to be extended, signaling to be used and the signaling class of the port.

NCI code position 1 & 2:
02 for 2-wire would be used in almost every case for an OPX service.
04 for 4-wire (not common at all!)

NCI code position 3 & 4: Here’s where the signaling type and port class would be spelled out for an OPX service.
NO = no signaling and no port class would be needed. (Sec NCI would have to match with NO also.)
LO = Loop start signaling open-end with no port class info available. (Not recommended for use on OPX.)
LA = Loop start signaling with an A Class port. (A class port per registration can signal up to 0 Ohms or very short loops. i.e. Same building only.)
LB = Loop start signaling with a B Class port. (B Class ports per registration can signal up to 200 Ohms or still short loops by Telco standards. i.e. though a large warehouse or a medium sized commercial campus.)
LC = Loop start signaling with a C class port. (C Class ports per registration can signal up to 900 Ohms or standard Telco loops. i.e. Often thought to be equal to the signaling characteristics of a DMS or 5E.)
GO = Ground start signaling with no port class info available. (It’s generally assumed that a Ground Start OPX port of a PBX is a class C equivalent, so this is often the only available NCI option for ground start at the PRI-LOC.)

NCI code position 5: 2-wire analog interfaces are always thought to be 600 Ohm impedance which is represented by a 2.

02LC2 for a PRI-NCI = 2-wire, loop start, open-end, C Class port with 600 Ohm impedance. For the example ASR # 478642 for the Foristell Police Department this would be the desired A-end NCI (provided it has a C Class port.)

Sec NCI codes for OPX:
For an IntrA-LATA Off Premise Extension where no other Telco’s are involved (non-meet point) the Secondary-LOC (Z-End) would be the customers tele-set or telephone. The information conveyed about a telephone is much less complicated. The number of wires that interface the device and the signaling type is usually the extent of the information.

NCI code position 1 & 2:
02 for 2-wire would be used in almost every case for an OPX service.

NCI code position 3 & 4: Here’s where the signaling type would be spelled out for an OPX service.
NO = no signaling and no port class would be needed. (PRI NCI would have to match with NO also.)
LS = Loop start signaling station-end.
GS = Ground start signaling station-end.

NCI code position 5: 2-wire analog interfaces are always thought to be 600 Ohm impedance which is represented by a 2.

02LS2 for a SEC-NCI = 2-wire, loop start station-end, with 600 Ohm impedance.

The term OSNA is a USOC Term (Universal Service Ordering Code).
Typical designations are 63OSNA123456.
The first 2 digits determine the location where the circuit was engineered (63 in New York State is Syracuse).
OS stands for outside station, N is non data, and the A stands for ancillary equipment (not telco) connected to the circuit (like the pBX at one end and the phone or key equipment at the far end.
Gary

Gary, Thank you for your information on this. Nice to have someone else to give us information on this type of question. Very informative.