atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's DSX-1 vs DS-1

OK what is the diferance between these to types of T-1's? I know one is long hual and the other is short hual, but what are the diferances technicaly? Is it a db setting? some other signaling type?

I'm sure there is other terminology, but a T1 is a T1. We always referred to the DSX as the jack location. Levels are the sameh. Only thing that affects what you want for levels is if it comes in on copper or fiber.

Like justbill stated
A T1 is a T1 is a T1 .

You'll see DSX-1 listed as the crossconnect point in the central office; you'll also see it as the T1 handoff on some channelbanks such as Adtran Total Access series.

Same thing as others have said just a different way to ‘splain it.


* DS1 describes the digital electrical signal that T1 uses. (Digital Signal One) 1.544 Mega-bits per second for North America.

* DSX-1 is describing a physical / mechanical jack used for cross-connecting a DS1 signal.

Don’t mean to pick on ya… but not really just that simple.
* AMI or B8ZS?
* SF or ESF?
* Channelized or non-channelized?
* DS1 or Virtual T1 (vt1?)
* Conventional T1 line code or 2B1Q (2 binary, 1 Quaternary?)
* Turned-up and working or TUB (turned up broke?)


It is that simple that in North America DS1 = T1 = 1.544 Mbs (period) but there’s all sort-a, kind-a flavors and variations out there to be used.

There's variations in the line coding and framing but it's still a T-1 signal. I can take an ESF circuit and do nothing more than convert it to SF at an end test point (AT&T) and now the customer is receiving a D4/SF signal on the same circuit moments ago he had ESF/B8ZS. Channelized doesn't matter, it's still a T-1 whether you channelize it or the Telco does..A T-1 is a T-1, you can put what you want on it to make it do your bidding.

DSX-1= digital signal cross connect 1. AKA T1 patch panel. This is what you find in C.O.'s and at the t1 side of an M13 multiplexer (ds3 mux). It is the ds1 patch panel used to cross connect circuits at the ds1 level. A five conductor wire is used to do the cross connect (Tx pair, Rx pair and trace wire) The front of the panel uses bantum type jacks to override the circuit and to intrude on the circuit with test equipment. There is also a bantum type jack for non-intrusive testing. Bantum style jacks are the old looking phone jacks. This where the term 'Tip and ring' came from.

DS1= Digital Signal Level 1. This an electrical signal.

DSX-3 is the same type of panel at the DS3 level. It uses BNC type conectors on coax for the cross connect and WACO type plugs for testing.

CnGRacin, What do you race?

Good expanded explanation of DS1 vs. DSX-1.

Dirt Track… An open wheel economy modified to be exact.