can some one briefly explain ISDN 2

[Adamtayloruk]

i originaly wanted adsl but it does not support my area and i want faster download speeds e.t.c
I have heard ISDN is twice as fast as 56k dial-up but is it avalible the same as 56k dial-up or is it cable like ASDL.
Or is there anything else i or could i get adsl through somthing else.

How about sattelite but i've heard it's expensive.....


Thanx for your help.

 

[benzito]

ISDN <Integrated Services Digital Network> is provided by your phone company and utilizes the same kind of physical wiring as your 56K dial-up lines uses. ISDN is not &quot;always on&quot; and you do have to &quot;dial up&quot;. A ISDN BRI <basic rate interface> line has 3 channels, two for carrying your internet traffic or voice data <64K each> and one for control and signaling <16K>. Throughput on a ISDN BRI line is up to 128Kbps. The best thing about ISDN is that you can use the two bearer channels independently of one another. In other words you can have a phone conversation on one channel while you surf the web w/ the other (remember that since both bearer channels are rated @ 64Kbps, using one channel for another purpose will cut you bandwidth in half).

My advice would be to go w/ Cable and only look into alternatives if it's not avail in your area. I would choose ISDN over Satellite as it's generally more reliable and w/ more consistent data transfer rates

*ADSL is not a service provided by cable companies, it's rides copper wiring usually provided by your phone company just like ISDN.

 

[Adamtayloruk]

Thanx for your information it was very helpful.
I will look into ISDN.....

 

[StarTAC]

some more info on ISDN... well, ISDN-PRI is a message-oriented line, which means that the phone company will send you ring voltage out-of-band [CCS -Common Channel Signalling].. of course, you will lose one channel for signalling, the 1D channel but the gain is that all your other data channels, the 23B channels, are all DS-0, which is 64Kbps.. full time..

this may not be what you are looking for, because it might be more expensive than ISDN-BRI, although it's about 1.544Mbps [1.536Mbps usable]...

now, u can only make ISDN-BRI calls on an ISDN-PRI protoco-based circuit.. that means that u will have to find out how your telco modulates its ISDN-PRI service.. if it does in-band signalling, it will do what's known as robbed-bit signalling [CAS -Channel Associated Signalling], where the D signalling channel is buried in the B channels, using the least-significant bits to indicate the hook condition.. these &quot;insiginificant&quot; bits are robbed from the DS-0s, leaving you with all the 24 channels, but robbing 8Kbps from each DS-0, leaving each channel with 56Kbps.

so.. u will need to find out from your ISP, telco, or both, what kind of signalling they use on the T-1 [US] or E-1[Europe], whether it's in-band or out-of-band, which will help u know what kind of service to expect and how much you should pay for what...

good luck