ISO/IEC 11801:1995/AMD1:1999

INTERNATIONAL
ISO/IEC
STANDARD
AMENDMENT 1
1999-02
Amendment 1
Information technology –
Generic cabling for customer premises
Amendement 1
Technologies de l’information –
Câblage générique des locaux d’utilisateurs

 ISO/IEC 1999
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– 2 – 11801 Amend. 1 © ISO/IEC:1999(E)

FOREWORD
This amendment has been prepared by subcommittee 25: Interconnection of information

technology equipment, of ISO/IEC Joint Technical Committee 1: Information Technology.

The text of this amendment is based on the following documents:

Text for vote Report on voting

ISO/IEC 11801:1995 ISO/IEC JTC1/SC25 N484

DAM1 and DAM2
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
___________
Page 15
5.5.3 Telecommunications outlet
Replace the third paragraph with:
1)
A minimum of one TO served by 100 Ω or 120 Ω cable shall be provided at each work area
(100 Ω preferred). Other TOs shall be supported by either balanced cable or by optical fibre
2)
cable . In the horizontal cabling, at least one TO shall be configured as specified in item b of
6.1.3 (balanced or optical fibre cable) or at least one TO shall be served by either class D or
3)
optical class, as identified in 7.1.1. When a TO is supported by balanced cable, 2 pairs
or 4 pairs shall be provided at each TO; all pairs shall be terminated. If less than four pairs are
4)
provided, the outlet shall be clearly marked . Emerging balanced cable applications may be
limited by differential delay of pairs that serve a single telecommunications outlet. See clause 9
for TO specifications that correspond to each of the cables listed above.
Footnotes
Replace footnotes with:
1)
When the greatest flexibility is desired, four pair or two quad cable should be used (see Annex G).
2)
When the largest bandwidth is desired the use of optical fibre is recommended.

3)
Installation of 2 pairs not capable of forming class D links may limit the applications supported.
4)
See annex G for number and performance of pairs needed for different applications and their pin assignment.

11801 Amend. 1 © ISO/IEC:1999(E) – 3 –

Page 25
7.1.2 Link classification
Replace table 2 with:
Table 2 – Channel lengths achievable with different categories and types of cabling

Medium Channel length
Class A Class B Class C Class D Optical

class
1)
Category 3 balanced cable (8.1) 2 km 200 m 100 m ––
2)
Category 4 balanced cable (8.1) 3 km 260 m 150 m ––
2) 1)
Category 5 balanced cable (8.1) 3 km 260 m 160 m 100 m –
2) 2)
3 km 400 m 250 m 150 m –
150 Ω balanced cable (8.2)
3)
Multimode optical fibre (8.4) N/A N/A N/A N/A 2 km
4)
Singlemode optical fibre (8.5) N/A N/A N/A N/A 3 km
1)
The 100 m distance includes a total allowance of 10 m of flexible cable for patch cords / jumpers, work
area and equipment connections. Link specifications are
...