On Fri, 03 Jun 2005 04:27:06 GMT, Telamon
wrote:

In article ,
Tebojockey wrote:

On Fri, 03 Jun 2005 02:56:59 GMT, Telamon
wrote:

In article .com,
"rkhalona" wrote:

I've been a SWLer for at least 20 years, have a Ph.D. in EE, have
20+ years of experience in the telecomm industry (uwave, sats,
cellular, UWB...) and have taught grad/undergrad comm courses at
various U.S. universities.

I agree with another poster that the SW8/R8B sync. detectors are
among the best ever incorporated into SWL gear. My previous
comment about sync. doesn't mean that one cannot achieve similar
signall quality without it (e.g., using PBT, but how many
portables or low-cost tabletops have PBT these days?), but the
convenience of being able to select sidebands in sync mode is a
big plus.

This news group has more than it's share of Ph.D.'s and double E's
it seems.

Where do you think the future of telecom is going? Is it going to be
mostly fiber-optic or do you think RF for the last mile to the home
or business?

Do you think Ethernet is winning over ATM?

Ermmmm...ATM (asynchronous transfer mode) is a 53-byte packet
protocol that travels OVER ethernet (a method of transferring data
over coax cable - and wire pairs.). See IEEE standard 802.3.
Ethernet is the most widely installed local area network technology.
The most commonly installed Ethernet systems are called 10BASE-T,
providing transmission speeds up to 10 Mbps. Fast Ethernet LANs,
100BASE-T, provide transmission speeds up to 100 Mbps.

I suppose ATM could be stuffed into a ethernet frame but I have not
heard of it. In the telecom world it's ATM over SONET that terminates
at my DSL modem. The DSL modem is used as a bridge. Between my DSL
modem to the computer it's ethernet so I can use the usual routers and
or hubs.

ATM is a dedicated-connection switching technology that organizes
digital data into 53-byte cell units and transmits them over a
physical medium using digital signal technology. Individually, a cell
is processed asynchronously relative to other related cells and is
queued before being multiplexed over the transmission path. Because
ATM is designed to be easily implemented by hardware (rather than
software), faster processing and switching speeds are possible. The
prespecified bit rates are either 155.520 Mbps or 622.080 Mbps.
Speeds on ATM networks can reach 10 Gbps.

It can go over any of the SONET rates.

Maybe I should have been more specific. The question is whether
ethernet will take over the local metro area from ATM over SONET. I
expect that ATM over SONET will be maintained at higher levels in the
network.


R, but good discussion tho!

Regards,

Al in CNMI

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