Nothing special, just what is/was native. Go from an ESCON director through the CO, and on to the next director. No HYPERCHANNEL or anything like that.
---- Original message ---- >Date: Sun, 11 Dec 2005 18:47:50 +0800 >From: Ron and Jenny Hawkins <[EMAIL PROTECTED]> >Subject: Re: Channel Distances >To: [email protected] > >Ted, > >What sort of extension equipment are you talking about? > >For ESCON, 9km is knee in the curve for "droop". I think the distance with >MM was 2km, and SM was 20k. Combining MM and SM I think ESCD or XDF allowed >was supported to 47km, and DWDM would run to 60km, and at that point you are >down to about 4MB/sec data rate. > >The Fibre Channel protocol will support MM up to 500m and SM up to 10km, and >most HBA and/or Device ports have enough buffer credits to handle about 6km >at 1Gb. FCP ISL using DWDM can work pretty well up to 200km, but you have to >have enough buffer credits to get the full data rate. > >For buffer credits, don't just use the typical rules of thumb that are out >in the market place. They are based on 2112 byte frame size, but there is a >lot of equipment using smaller frames, which increases the number of credits >needed for the same distance. > >Ron > >> -----Original Message----- >> From: IBM Mainframe Discussion List [mailto:IBM- [EMAIL PROTECTED] On >> Behalf Of Ted MacNEIL >> Sent: Sunday, 11 December 2005 2:09 PM >> To: [email protected] >> Subject: Channel Distances >> >> I was asked the maximum distance that an ESCON Channel >> could span. >> IIRC, it was 40km for CTC, 20km for tape, and 9km for DASD. >> I was not believed. >> >> Does anybody know? >> And, where would I look this up? >> I haven't really cared since the early 1990's. >> >> Also, does anybody remember the distances for parallel >> (1.1, 1.5, 3.0, & 4MB/s -- if I recall all the speeds)? >> >> Also, what about FICON (all flavours)? >> >> Again, does anybody know where I could look this up? >> I have forgotten (getting old is not for sissies!). >> -teD >> Me? A skeptic? I trust you have proof! >> >> -------------------------------------------------------- -------------- >> 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 > >---------------------------------------------------------- ------------ >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 -teD Me? A skeptic? I trust you have proof! ---------------------------------------------------------------------- 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
