FAQ (?): Explanation of Bell circuit IDs?

[Thomas Goltz]

Anyone know where I can find a glossary of how a Bell-style circuit ID
is constructed? I know from experience that 36 IBZD 176436 SD is an
ISDN circuit (from the IBZD), but I have no idea what the other stuff
means.

--
James "Thomas" Goltz <go...@kivex.com> Senior NOC Engineer, KIVEX

[Terry Kennedy]

Thomas Goltz <go...@kivex.com> writes:
> Anyone know where I can find a glossary of how a Bell-style circuit ID
> is constructed? I know from experience that 36 IBZD 176436 SD is an
> ISDN circuit (from the IBZD), but I have no idea what the other stuff
> means.

This is mostly descended from AT&T craft practices, with some interesting
mutations. If this was a Bell Atlantic (ex-NYNEX) ID, it would be in a LATA
number ending in 36 in South Dakota.

Bell Atlantic New Jersey omits the leading digits.

I'm not familar with how other areas do it.

The 6-digit number in the middle is the identifier for that circuit (with
the other parts, of course). Bell Atlantic (ex-NYNEX) assigns them in blocks
to sales reps, while other places do it differently. Some oddball circuits
(non-tariffed services) start in the 9xxxxx range and work down, but the
starting point seems to be different for each non-tariffed service (either
that or there's a single sequence for all non-tariffed service).

The competing carriers do things differently. MFS uses ab-nnn-fff-ssss where
a is the type of circuit (0=DS0, 1=T1, 3=T3), b is the type of provisioning
(x=point-to-point, h=hubbed, etc.) nnn is the near end designator and fff is
the far end designator (from an arbitrary definition of which is "near"), and
ssss is a 4-digit sequence number. TCG seems to use aa-cccc-ssssss where aa is
the facility type (01 = T1), cccc is the service type (similar to the IBZD
in your example, but using different codes, and ssssss is the sequence number.

Terry Kennedy Operations Manager, Academic Computing
te...@spcvxa.spc.edu St. Peter's College, Jersey City, NJ USA
+1 201 915 9381 (voice) +1 201 435-3662 (FAX)

[Steve Ostrom]

That's interesting, the same format is used in Canada.

xx LLLL nnnnnn 0000 LLLL 0000

the first 2 characters are numbers or letters that vary with customer (or
customer type)
the next 4 Letters seem to indicate the type of service
the next 6 numbers are sequential - sometimes

With some circuits I have seen the 0000LLLL0000 at the end seems to indicates
which of the Canadian Telco's originated the order - or maybe the Z end of the
circuit.

This has been drawn from years of ordering and working on many of these.

Steve O.

Thomas Goltz wrote:

> Anyone know where I can find a glossary of how a Bell-style circuit ID
> is constructed? I know from experience that 36 IBZD 176436 SD is an
> ISDN circuit (from the IBZD), but I have no idea what the other stuff
> means.
>

[davis]

This is what is referred to as a "CLS" format circuit ID, "CLS" meaning
Circuit Line Serial ( if I remember all the acronyms correctly). The
information you seek is available under license from Bellcore (big $).
Example: aa/bbbb/cccccc/dddd/eeee
But in general the first two digits(a) indicate a region of a BOC, if used.
The next four(b) are really two segments combined, the first two digits of
this group are the NC code of the circuit, the second two are modifiers. The
numbers (c)(5 or 6 digits depending on carrier) are a serial sequence,
arbitrary by carrier. The next four(d) are a segment indicator for
mulit-point circuits(not positive on this, been quite some time since I
worked on multi-points). The final four(e) are usually a carrier
identification, if used. Typically when you see the IDs the virgules(/) are
omitted, but if you see a CLR/DLR/word doc/etc from the carrier they will be
shown.
For anymore detailed information, I would suggest finding a friend in the
industry or contact Bellcore.

Thomas Goltz wrote in message <7z4sps9...@noc2.kivex.com>...