TELECOM Digest OnLine - Sorted: Superframing and ESF ... A Little Confused

Superframing and ESF ... A Little Confused

benson_james@yahoo.com
14 Jul 2006 05:17:42 -0700

Hi folks, I could really do with some help with something.

I'm studying telecoms in particular T1 circuits. Currently its on about
superframing and Extended Superframing.

Ive been reading something:

http://telecom.tbi.net/t1_frm.html

D4 Voice and Data Signaling

The transport of signaling states is required in Switched voice or data

(Switched 56K service). Signaling is accomplished through a "Robbed
Bit" method where bit 8 of each channel's timeslot is "robbed" to
indicate a signaling state in the 6th and 12th frames. Effective
throughput for the A signaling bit (Frame 6) is 666.66 BPS. Effective
throughput for the B signaling bit (Frame 12) is the same (666.66 BPS).

But i cant figure out how they got to 666.66Bps?

Looking at the diagram on the webpage, the least significant bit in
all channels has the last bit robbed, for frames 6 and 12, so in every
superframe thats sent, thats 24 bits, multiply that by 8000 and i get
192Kbps???? Where am i going wrong.

Could someone explain this to me.

Thanks in advance.

Post Followup Article Use your browser's quoting feature to quote article into reply
Go to Next message: hancock4@bbs.cpcn.com: "Re: Bell Labs, Jansky, and the Jansky Monument in Holmdel"
Go to Previous message: Danny Burstein: "NYS AG Spitzer Again; Against Price Fixing Chip Makers"
Next in thread: William Warren: "Re: Superframing and ESF ... A Little Confused"
May be reply: William Warren: "Re: Superframing and ESF ... A Little Confused"
May be reply: James Carlson: "Re: Superframing and ESF ... A Little Confused"
May be reply: Robert Bonomi: "Re: Superframing and ESF ... A Little Confused"
TELECOM Digest: Home Page