ISP Information:
A bridge is a combination of hardware and software that connects local area networks (LANs) of similar types together. See router.
ISP Glossary:
bridge - tonypo1@cox.net wrote: Yeah -- I suppose that's what we got for having a monolithic phone company. Being the first doesn't always mean it's the best solution. But wasn't E1 evolved because of clock differences?One story I heard was that the difference in clock rate, and, hence,number of channels supportable, was that it had to do with differencesin the distance between loading coils and the wire gauge. The US used6000ft between loading coils and 19 gauge wire. The rest of the worldwas slightly different. The latter could support a bit higher clockrate. Since the channel clock rate is the same, 125us, this soundsplausible. Of course, 24 channels matched the existing US hierarchy,so I guess that played a part.I tend to think A law was an improvement. It puts zero on a riserrather than a runner such that the small amount of noise on a quietchannel helps clocking. I'm not familiar with any differences in thecompanding, but I think they are miniscule. Translation is usually bytable lookup (a simple decode). It's kind of a moot point nowadays -- with all the OC levels being pretty much international now.If you go to high enough bit rates it comes together. Another mergingfactor is VOIP on trunks. There you will see common encoding, withlocal dialects only near the tail ends.
|
