-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2010-09-14 17:37, James Knott wrote:
Carlos E. R. wrote:
Yes, I know what you mean. I wasn't referring to ISDN at all. Stand alone ADSL DSLAM shelves are available which can be wired in between an existing phone switch, including old analog ones, and the subscriber line. There is also another type, used for newer digital switches, where both telephone lines and ADSL are supported on the same equipment. It's entirely possible to use the appropriate card to provide basic rate ISDN, but I don't have experience with that. (I have worked with both basic and primary rate ISDN, but provided in a different manner.). So, if you had a old phone switch in a central office that was installed long before anyonehad even heard of the internet, you could still offer ADSL, by using the stand alone shelf. With the other type of shelf that I have worked with, the phone lines are connected to the switch via DS1 (T1) circuits (1.544 Mb/s) and the ADSL data via DS3 (45 Mb/s). The stand alone shelf uses etherent for the ADSL data.
I see. I saw those racks being installed, but it wasn't my section, couldn't find time to have a good look at them. And the switch I worked for (5ESS) was digital, so I did not know that analog exchanges could be given xdsl service. Good for them - or bad, it delays further the time for a renewal of equipment.
I often forget that the wikipedia is so vast :-) - -- Cheers, Carlos E. R. (from 11.2 x86_64 "Emerald" at Elessar) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org/ iEYEARECAAYFAkyPwe4ACgkQU92UU+smfQUuDACfSywyT+rhXO5NbA68pmc+ZXCW k8oAn13OKC9Da4s+mc97AdMP0KQ7zHwU =DfEn -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org