by CLLI for: DRRYNHEBDS1
Test Numbers for this CO (DRRYNHEBDS1)
|No Test Numbers Currently Availble... If you know one, please send it to us!
If the CO listed above is owned by AT&T (might say
Ameritech, Pac Bell, etc.) and we don't have test numbers listed here,
Click HERE for the Test Line Look-Up Site from AT&T to do a
search for the area and exchange code, or the CLLI code (from the
above result). I don't know how accurate AT&T's data is, but there's a lot of
AT&T has lots of handy Test Line
Click HERE for AT&T's Test Line Decription PDF,
which tells you what they call the various Test Lines
in their Test Line listing (it's fairly hard to
Be sure to read the other notes
Clicking on Map It! will lead you to Mapquest. If the map doesn't come up (due to different abbreviations), it will usually give you a button to click for a suggested location, which is
sometimes accurate (or copy the address and paste it
into google to get a google map).
This could help you determine how far the premise is from the CO, but our database doesn't have
any SLCs (in the neighborhood) - which could be feeding the dial tone to the premise. The database usually does have Remote Central Offices which sometimes serve smaller towns.
You can also click to see all of the exchanges working out of that CO (the CLLI code is assigned to the switch itself, and they assign a new exchange code to a CO to go over 10,000 lines), or click to see all of the COs at that address (co-located COs like CLECs and cellular providers). A cellular provider's CO doesn't really apply to the geographical location of the CO... It's just the place where they patch the cellular calls onto the PSTN. They would use T1s to go to the individual cell towers located all over the place.
At most COs, the 1KC Tone is always the exchange code plus a particular last four digits.
3 digit codes (like 211 or 290) have pretty much gone away since X11 numbers are
politically valuable, and many area codes have run out of exchange codes. In the Chicago area, 9996 and 9940 are popular for the 1KC tone, and 9939 or 9995 for Silent Termination. 9997 or some other number is used to open a circuit automatically for a few minutes from the CO for testing in the field (to remove talk battery so you can test with a Kick Meter or Sidekick).
If you know the common four digit station numbers that a particular Phone Company uses, you may be able to figure out the test number you need by trying those four digits with all the exchanges shown for that CO in CO Lookup (like XXX-9996). Since there are usually several exchanges working out of larger COs, the test numbers
may only be
on one of the exchanges.
As an example, if you do a CO Lookup on the 630-295 exchange, you'll find that there are quite a few exchanges working out of that CO (they all have the same CLLI code). Neither 630-295-9996 or 630-295-9940 give you a 1KC Tone, but if you try each of the exchange codes in that CO, when you get to 630-980 you'll find that 630-980-9940 gives your a 1KC Tone.
Remember that on the list of exchanges working out of the same CO, there can be more than one area code in a Central Office (CLLI code). In the case of the CO that has the 630-295 exchange, there are several 847 area code exchanges. This is usually the result of area code splits, where the line between the two area codes went right through the area where a single Central Office served several cities.
Please keep in mind that
portability makes this list less than accurate.
And there's no easy way to know if the line has been
ported (the customer often doesn't know!).
customer could have ported his numbers over to (or from)
a CLEC. If the CLEC is co-located in the same CO, the
LEC's test number will be accurate. If the CLEC has
their own switch somewhere else and they're just using
the LECs copper to the premise, the LECs MW tone may not
be accurate (0db at the CO) since you can't account for
any loss between the CO and the LEC's switch.
Some CLECs provide their
own MW tone out of their switch. If you do get a number
from our Lookup or the CLEC, make sure it's from the actual switch
that the customer's dial tone is coming from. It's
impossible to get an accurate circuit loss reading if
the tone is coming from a different CO since there's
always an unknown amount of loss on the trunks between CO's (and you don't know how many COs are involved).
NOTE: This data was carefully compiled and cross checked from a number of
sources. Because of the amount of data, there are bound to be some mistakes. Mike
Sandman Enterprises, Inc. makes every effort to prevent errors, but is not
responsible for any errors in the data. Use this data at your own
Addresses may not be
accurate. CO addresses are no longer public
information (so a terrorist will never be able to
find those CO buildings), so we have no way of
verifying them. The good thing is that COs seldom
move since there's a lot of wire involved. If we
don't have an address in the database, we'll have no
way of knowing which CLLI codes are at the same
physical location. We give you as much as we know is
accurate (or try to know?).
The name of the phone
company may not be accurate (it may be a name used
in the past). Phone companies have been bought and
sold so often and changed their names so often
that we gave up trying to keep up with it.