home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Internet Standards
/
CD2.mdf
/
ccitt
/
1992
/
l
/
l12sum.txt
< prev
next >
Wrap
Text File
|
1994-11-03
|
2KB
|
57 lines
INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : L.12
Title : Optical fibre joints
Study Group : VI - Outside Plant
Version : New
Date of adoption : 1992
Notes :
Optical fibre cables have become common in telecommunications for
trunk, undersea and feeder routes and are now expanding into the
subscriber and indoor sections of the network. They are installed in
all environments: aerial, duct, cable tunnels, direct buried and
on-premises. Thus, optical fibre cables are exposed to all of the
hazards that copper cables are. An important part of any installed
optical fibre cable system is the fibre joint, which can have a great
influence on the transmission quality and maintenance costs. The loss
of a joint can equal the insertion loss of as much as one half to one
kilometre of fibre.
Recommendation L.12 advises on the mechanical, environmental and
optical characteristics of optical fibre joints, and advises on
suitable testing methods. Further information is provided in the CCITT
Manual "Construction, installation, jointing and protection of optical
fibre cables".
Recommendation L.12:
- refers to the jointing of optical fibre cables that are
used for telecommunications networks, in duct, tunnel, buried, aerial,
and underwater installations;
- deals with loss factors of optical fibre joints in
multimode graded index and single-mode fibres;
- deals with optical and physical characteristics of optical
fibre joints concerned;
- acknowledges there are two basic types of optical fibre
joints (fusion and mechanical) with numerous design variations;
- advises on appropriate test methods for optical fibre joints.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).