Today we shift our gears a bit to look at a technology that emerged in the late 1980s as a way to reduce the cost of provisioning a T-1 . Known as High-bit rate Digital Subscriber Line (HDSL), this technology, and later versions of it, have made true Read More...

Today we conclude our examination of SONET ring types. In the past two days we looked at unidirectional path switched rings (UPSR) and two-fiber bidirectional line switched rings (2F-BLSR). Today we look at the larger four-fiber bidirectional line switched Read More...

Now isn't THAT a mouthful? Today we continue in our examination of SONET ring types. Yesterday we looked at the unidirectional path switched ring (UPSR). Today we'll take a quick look at the two-fiber bidirectional line switched ring (2F-BLSR). Read More...

We've talked before about SONET . If you caught those sessions, you know that SONET protects circuits using a ring architecture. What you may not know is that there are actually three kinds of SONET circuits. Over the next three days, we're going Read More...

And now for something a bit different. I'm getting a little sick of themes, so I thought I'd role the dice this morning and randomly pick a topic. If you use a DS-0, DS-1, or DS-3 service, then somewhere in your network you have a CSU / DSU . Read More...

Happy 4th (if you're from the U.S.)! Yes, yes, I know you're impressed that we keep plugging on even on holidays. That's just the way we are here at Hill Associates. Actually, we're smarter than that. We prepare the snack in advance so Read More...

Yesterday, we spent some time looking at the requirements for ones density on a T-1 . We saw that this requirement is met by the voice encoding process when the T-1 is carrying voice, but we noted it is problematic when the T-1 is carrying data. Today Read More...

Today we start a new series, and it will be focused on the T-carrier transmission systems, beginning with the T-1 . This series is inspired by some of the questions that arose last week in a class that I taught. Today we'll start with an overview Read More...