Will wrote:
I've read some IBM redbooks and other documents that in general describe how
you can extend ETR / CLO timer signals through DWDM systems. What I am
completely baffled by is that the ETR / CLO signals are multimode, and the
cards on DWDM systems like IBM 2029 and Nortel OPTera 5200 that understand
ETR / CLO as a protocol are all singlemode interfaces. The multimode
cards on the OM5200 do not list ETR / CLO protocols on their menus. Even
the newer-generation multimode cards in the OM5200 do not list ETR / CLO.
More than one person has told me that they have gotten the singlemode DWDM
cards to work with the multimode ETR / CLO signals. How is that possible?
Nobody answered, so I'll do.
IMHO it is just impossible.
MM device cannot be connected to SM device. The only result one can get
is damage of the device.
In this case I'd suspect there is some converter (MM to electrical
signal to SM), maybe it's not listed in configuration.
Another remark is that ETR signal is low-rate (when compared to
FICON/FC), but requires more bandwith than ESCON, probably because of
the accuracy. I'm not sure of that, but I heard it.
HTH
--
Radoslaw Skorupka
Lodz, Poland
----------------------------------------------------------------------
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
