| DFON was announced in the latest Sales Update (Jan 8, 1990, Vol
21, No 14) page 44.
The documentation listed in the article is:
EK-DECSY-EG Requirements Evaluation Workbook
EK-DECSY-FP Fiber Optic Network Planning and Config Guide
EK-DECSY-FI Fiber Optic Network Installation Guide
EK-DECON-IP DECconnect Illustrated Parts Breakdown
BEWARE - CHECK the revision of the first and forth items, as previous
versions exist. I know the new IPB should be rev -003. I don't know
about the Eval Guide. The other two manuals are new.
Bryan
|
| From: BAGELS::HANNULA "ROBERT AT TAY2-2/N4 227-3724 15-May-1990 1023" 15-MAY-1990 10:53:36.30
Subj: Warnings on ordering DFON DOC SET
The entire DFON doc set will be available from NRO on MAY 31.
Currently EK-DECSY-WI and EK-DECON-IP are on the shelf, orderedable and will
be shipped.
Currently the EK-DECSY-FP and FI cannot be ordered. The FP and FI documents can
ordered after May 18. At that time, they will be back ordered and shipped in the
first weeks of June.
Currently an out-of-date version (version 3) of the EK-DECSY-EG is on the shelf
and orderable. To get the new version (v4) YOU MUST ORDER AFTER May 31.
Thanks
Robert Hannula
Document Order No.
DECconnect System H3111 Modular Wallbox Installation EK-DECSY-WI
DECconnect System Illustrated Parts Breakdown EK-DECON-IP
DECconnect System Fiber Optic Planning and Configuration EK-DECSY-FP
DECconnect System Fiber Optic Installation EK-DECSY-FI
DECconnect System Requirements Evaluation Workbook EK-DECSY-EG
|
| <<< MOUSE::USER$:[NOTES$LIBRARY]FDDI.NOTE;1 >>>
-< FDDI - the Next Generation >-
================================================================================
Note 82.0 DECconnect Fiber Planning Documents No replies
SMAC::MACARTHUR 9 lines 25-JUN-1990 15:20
--------------------------------------------------------------------------------
Two new manuals are now avalible for planning, configuring, and
installing fiber optic networks including FDDI and Fiber Ethernet.
Both these manuals are apart of the DECconnect documentation series.
They can be ordered directly from NRO. The part numbers are:
1) EK-DECSY-FP "DECconnect System Fiber Optic Planning and Configuration"
2) EK-DECSY-FI "DECconnect System Fiber Optic Installation"
|
| From: BAGELS::HANNULA "ROBERT AT TAY2-2/N4 227-3724 16-Jul-1990 1147"
Subj: FC is now the recommended Single Mode connector for premise wiring
NEW INFORMATION and NEW RECOMMENDATION on Premise Single-Mode (SM)
Connectors
DEC SM product Engineering (FDDI Concentrator/SM board - FCS Jan 91
and GIGALink/GIGANet projects - Advance Developement project/ no
FCS) and DFON Engineering have selected the FC SM connector. If the
customer requires you to terminate SM premise cable, use an FC SM
connector. Do not install the AT&T STII as recommended in the DFON
doc set. This is a change to the 4th level recommendation as
described below.
The FC is a keyed, screw on connector.
CURRENT RECOMMENDATIONS (as printed in DFON documentation)
DEC and the DFON doc set have a multilevel SM recommendation.
First, we recommend that the fiber premise installation should
include single-mode (SM) fiber. Second, because there are
currently very few applications for SM fiber, the DFON doc set
recommends that installed SM fiber be left unconnectorized.
Third, if the customer has a known application to install on the
SM fiber, DFON recommends the installation of SM connectors
compatible with the SM equipment to be installed. Finally (4th
level), only if the customer has no known SM applications yet
requires DEC to install a SM connector at the time of the fiber
installation, we recommend the AT&T STII SM connector (DECconnect
Fiber Optic planning Guide, page 11-16). This 4th level
recommendation has been chnged to an FC connector.
Why the FC SM connector was chosen.
At a recent meeting between DFON engineering and SM product
engineering the advantages and disadvantages of various SM connector
options were compared. Three SM connectors were examined, the STII,
the SC, and the FC.
STII advantages
o Field knows how to install MM STII. SM STII install is very
similar.
o SM Install kit would be a minor addition to MM ST kit
o Easy mating (BNC style rather than screw on)
o It is the current DFON SM recommendation
STII Disadvantages
o A US, rather than international standard.
FC Advantages
o Visibly different from STII so SM connections and patch cables
would not be confused with MM STII connections and patch cables.
Page 2
o International standard and vendor availability.
o APC (angled physical connection) a planned future improvement.
(more on this later)
o Current connector of choice for FDDI SM product.
FC Disadvantages
o Screw on mating
o Possibly harder to field install
o New tool kit and install training required
o Possible to mis-mate (Connection appears mated but is extremely
high loss)
SC Advantages
o Very small connector resulting in highest density patch fields
o Easy mating
o Low cost
SC Disadvantages
o Very new technology,
At the meeting, it was decided that the SC was just too new to
consider. It was also decided that SM connections should be visibly
different from MM connections and that the FCs international
acceptance and availability made it the obvious choice for DEC's SM
connector. Preliminary engineering evaluation of a limited set of
FC connectors showed the FC was a reliable, field installable
connector.
Additional information concerning the FC connector
Currently, the FDDI SM project is using a SM connector made by
3M/Dorran. The Dorran part numbers for the connectors are 02-00072
(125 micron hole size), 02-00071 (126 micron hole size), and
02-00073 (127 micron hole size).
Note that since fiber outside diameter varies between 125 and 127
microns, all single mode connectors have several ferrule hole size
options to accomadate the varying fiber OD. At connectorization,
all ferrule hole sizes must be on hand and the fiber is matched to
the best fitting ferrule hole.
The 3M/Dorran FC to FC barrel (coupler) is 02-00075 This is not a
recommendation to use these parts, just information on what is
currently being used by engineering.
Page 3
To support the SM premise connection, a qualification test similar
to the DFON MM connector effort is planned. This effort will
examine the FC product from various vendors for ease of
installation, connector light loss, long term reliability,
intermatability between various vendors products,... The result of
this testing will be fed back to the vendors to improve their
product and will also result in DEC approved FC connectors and cable
assemblies. There will also be some research into SM splices and
their use with FC pigtails.
More information on the FC APC
A future improvement of the FC SM connector is an angled physical
connection. In this connector configuration, the end of the
connector is angled at about 10o and produces a low return
reflection (about -60 db) (whether connected or unconnected). This
low return reflection might be required in SM high bandwidth
applications. The FC APC SM connector might not be field
installable (pigtail might be required).
|