Here's the skinny on T1 since I've done one on a TD1232, and numerous others
on other systems.
1. TD187 module is required for T1 it provides 24 channels w/ 8 analog lines
per system, (single/dual cab)
( A channel bank could be used, but I personally feel, if you are like to
mess with lots of wires,and punch blocks and cross connect, and have
Napoleonic visions of a large PBX room as your office, then they are ok.
Most of my customers have limited space, and want a minimum of stuff hanging
everywhere, so I opt for the TD187. Conversely, the price of the channel
bank , and all the TD180 CO modules you'll need, plus the dual cabinet to
contain all the analog lines far exceeds the cost of TD187 module.
Especially, on a single cab system.)
2. A CSU is optional but in most instances required by the LEC or CLEC in MD
it's required by law.( I would recommend a CSU.)
3. Programming on the TD1232 is slightly involved, and you need to know your
terminology for implimenting it. B8ZS, AMI, ESF, etc. (if you don't know
these, you'll need help, or refer to a qualified installer)
4. DID can be performed on T1, as well as TIE lines. No Caller ID (CLID).
DNIS is provided for the DID.
5. Tarriffing for LD is usually on a per call, per minute charge with
incremental billing, as well as a per month charge for the line. typically
$500/mth, 5c/min, 6s increments
6. 800 inbound can be applied to the T1 with similar cost as the LD.
Advantages to this is an increase of inbound coverage with the 24 channels.
7. The T1 can be split by the most LD companies or the CLEC for
outbound/inbound
(examples being 12in/12out, 20 in/4out, etc.) This would depend on your
business app.
8. Analog lines are required for THREE reasons:
a. If the T1 span goes down, you have backup
b. 800 calls must go out the analog lines, 800 calls CANNOT go over
the T1, it against the law, and most CLEC's and LD carriers will not complete
the call if sent over the T1 span.
c. you still need analog lines for local inbound/outbound traffic
9. Call centers obiously benefit from T1, if you are line heavy with lots of
LD and inbound 800 traffic, they are great.
10. I have a very busy tech support center with multiple 800's coming into
the location, a dual cab with the 8 analogs handing local tech support on 4
of them, with the other 4 for admin/sales calls. They have used all 32 lines
available to them. We split the T1 for 16 inbound, 8 outbound. It works
great, but it took 2 days to get the LD carrier to send me the correct DNIS
info for call routing. They can be a bear to get running, but once they run,
they run well.
Steve L. Martin
<A HREF="http://www.geocities.com/surfsidesound/";>Surf Side Sound, Inc.</A>
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