🚀 go-pugleaf

There's 3 parts to a DDS connection, whether it's 56K or higher.  In the
phone office is a gadget called an office channel unit (OCU) that's
connected to the telco's end of the local circuit.  At the customer's
premises the circuit is connected to a channel service unit (CSU); if the
line terminated in a piece of digital equipment (like a Netblazer) the CSU
is connected to a Data Service Unit.  I found a definition at
http://www.zdwebopedia.com/CSU_DSU.htm


"Short for Channel Service Unit/Data Service Unit. The DSU is a device that
performs protective and diagnostic functions for a telecommunications line.
The CSU is a device that connects a terminal to a digital line. Typically,
the two devices are packaged as a single unit. You can think of it as a
very high-powered and expensive modem. Such a device is required for both
ends of a T-1 or T-3 connection, and the units at both ends must be from
the same manufacturer."  (btw, different manufactures work fine; that's
what standards are for...)

Work for a phone company and they give you a hard time when you get it
wrong - especially if you're the computer guy...

Kirk Yarina
up.net, a service of Baraga Telephone...



>Johnson, John E. wrote:
>> 
>> Stuart,
>> What is the manufacturer and model# of your DSUs?  (I say "DSU" because you
>> previously had stated you were using a 56K circuit.  The term "CSU" to me
>> means a T1 circuit.)
>> 
>> Carrier going up and down continuously indicates either a line problem or
>> improper something (ie:  optioning, cables, defective unit) with the DSUs.
>> 
>> John


Kirk Yarina		up.net Senior Systems Administrator
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