Tài liệu Definition - Copper Balanced Twisted Pair - from ISO 11801 ppt

ISO/IEC JTC 1/SC 25 N 739
2001-10-10
ISO/IEC JTC 1/SC 25N739t.doc 97
Annex E 2463
(informative)2464
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Acronyms for balanced cables2466
There is a great variety of cable constructions and a number of systems to describe these2467
constructions in a shortened form. These abbreviations have been used to describe the2468
difference in construction, as well the difference in impedance. Since such acronyms are used2469
in many commercial documents and have never been clearly specified by a standard, the same2470
term could mean different kinds of constructions in different context.2471
The intention of this annex is to clarify this situation and give guidance on how to use2472
abbreviations for the main constructions used for communication cables. This document uses2473
the words balanced cable, unscreened/screened cable and unscreened/screened cable2474
element for the cable constructions described in this annex.2475
To reduce confusion a more systematic naming is specified in Figure E. 1. It is understood that2476
cable names based on this schema only describe the types of constructions and not any2477
transmission characteristics such as impedance. All screened cables, whether individually or2478
overall, foiled, braided or both, require matching connecting hardware capable of handling all of2479
the screens involved.2480
Figure E. 2 gives examples of cable constructions and their name based on this schema.2481
xx / xxx
| | |_ balanced element __ TP
| |__ element screen ____ U = unscreened
| |__ F = foil screened
|
|___ overall screen _____ F = foil screened
|__ S = braid screen
|_ SF =braid and foil screen
For example:

SF/UTP = overall braid and foil screened cable with unscreened balanced elements
S/FTP = overall braid screened cable with foil screened balanced elements
Figure E. 1 - Cable naming Schema2482
ISO/IEC JTC 1/SC 25 N 739
2001-10-10
ISO/IEC JTC 1/SC 25N739t.doc 98
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Figure E. 2 - Cable Types2535
NOTE - sometimes the letter P in the abbreviation is replaced by Q to characterise a quad construction.2536

U/UTP:
Cable sheath
Pair
Conductor
F/UTP:
Cable sheath
Foil screen
Pair
Conductor
SF/UTP:
Cable sheath
Braid screen
Foil screen
Pair
Conductor
S/FTP:
Cable sheath
Braid screen
Foil pair screen
Pair
Conductor
S/FTP:
Cable sheath
Braid screen
Foil quad screen
Quad
Pair
Conductor
U/FTP:
Cable sheath

Foil pair screen
Pair
Conductor
U/FTP:
Cable sheath
Foil quad screen
Quad
Pair
Conductor
U/UTP:
Cable sheath
Quad
Pair
Conductor