John So we have a fancy new name for antediluvian frequency division multiplexing (FDM) - or am I missing something?
>From the provided URL for DWDM: "DWDM works by combining and transmitting multiple signals simultaneously at different wavelengths on the same fiber." I never heard of FDM being described as "in effect, one copper wire transformed into multiple virtual copper wires." I guess teleprocessing folk of the past lacked imagination. Chris Mason ----- Original Message ----- From: "Chase, John" <[EMAIL PROTECTED]> Newsgroups: bit.listserv.ibm-main To: <[email protected]> Sent: Friday, 02 February, 2007 2:26 PM Subject: Re: Cascaded FICON and HCD > > -----Original Message----- > > From: IBM Mainframe Discussion List On Behalf Of Rick Fochtman > > > > ----------------------------<snip>--------------------------- > > The short answer is Yes, you can do it. FICON is so fast that > > you should not have trouble with 12 drives--assuming that > > distance is not a problem. I don't know what the native > > limitations are, but we use DWDM to 120 KM. > > > > Actually in the 'olden days' of ESCON, channel extender > > products provided a similar capability, but the pathing was > > not known to MVS. > > FICON lets it all hang out. > > --------------------------<unsnip>-------------------------- > > Pardon me; my education is lacking. > > > > DWDM ?? "Dark fiber" ?? > > DWDM: Short for Dense Wavelength Division Multiplexing, an optical > technology used to increase bandwidth over existing fiber optic > backbones. > > http://www.webopedia.com/TERM/D/DWDM.html > > Dark fiber refers to unused fiber-optic cable. Often times companies lay > more lines than what's needed in order to curb costs of having to do it > again and again. The dark strands can be leased to individuals or other > companies who want to establish optical connections among their own > locations. > > http://www.webopedia.com/TERM/d/dark_fiber.html > > -jc- ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
