IEC 60603-7-81-2015 pdf download.Connectors for electronic equipment – Part 7-81: Detail specification for 8-way, shielded, free and fixed connectors, for data transmissions with frequencies up to 2 000 MHz.
4 Cable terminations and internal connections – Fixed and free connectors
See Clause 4 of IEC 60603-7-1 :201 1 for cable termination and internal connections types.
5 Gauge
The gauge as defined by Clause 5 of IEC 60603-7-1 :201 1 shall apply.
6 Characteristics
6.1 General
6.1.1 Overview
Connectors according to this standard shall meet all relevant requirements specified by IEC 60603-7-1 .
6.1.2 Pin and pair grouping assignment
The pin and pair grouping assignment of Figure 9 of 6.2 of IEC 60603-7:2008 applies.
6.1.3 Classification into climatic category
Connectors according to this standard are classified in the same climatic categories as defined by IEC 60603-7.
6.2 Electrical characteristics
6.2.1 General
Connectors according to this standard shall meet the electrical characteristics specified by IEC 60603-7-1 .
In the following clauses/subclauses, f is the frequency expressed in MHz.
6.2.2 Transfer impedance
In addition to 6.2.1 , the transfer impedance of connectors conforming to this standard shall meet the following requirements.
Conditions:
When tested according to IEC 6051 2-26-1 00, Test 26e, mated connectors, terminated with each cable type (e.g. F/UTP, S/FTP) intended to be used for these connectors shall not show higher magnitude of transfer impedance as given by formula:
All types: ≤ 0,05f  0,3 Ω from 1 MHz to 1 0 MHz ≤ 0,01 f Ω from 1 0 MHz to 80 MHz.
6.3 Transmission characteristics
6.3.1 General
Compliance to this standard in respect to transmission characteristics, is determined according to specific test methods described in test group EP, see Table 1 . The interoperability of connectors compliant to this standard shall be demonstrated by testing the fixed connectors with the full range of free connectors according to IEC 6051 2-28-1 00.
Compliance to this standard in respect to the alien (exogenous) crosstalk is determined according to specific test methods described in IEC 6051 2-25-9.
All transmission performance requirements apply between the reference planes specified in and edition of IEC 6051 2-28-1 00.
NOTE At the date of issue of this standard, the test method was under consideration. 1 st edition of IEC 6051 2-28-1 00 will be updated to 2 000 MHz as 2 nd edition.
6.3.2 Insertion loss
Conditions:
IEC 6051 2, test 28a.
Mated connectors.
All pairs: ≤ f 02 , 0 dB, from 1 MHz to 500 MHz.
All pairs: ≤ f f 000605 , 0 00649 , 0 + dB, from 500 MHz to 2 000 MH.
Whenever the formula results in a value less than 0,1 dB, the requirement shall revert
to 0,1 dB.
6.3.3 Return loss
Conditions.
IEC 6051 2, test 28 b.
Mated connectors.
All pairs: ≥ 72-20 log (f) dB from 1 MHz to 2 000 MHz.
Whenever the formula results in a value greater than 30 dB, the requirement shall revert to 30 dB.
Whenever the formula results in a value less than 1 2 dB, the requirement shall revert to 1 2 dB.
6.3.4 Propagation delay
All pairs: ≤ 2,5 ns.
The propagation delay test does not need to be performed, since it is assumed that connectors comply by design.
6.3.5 Delay skew
All pair combinations: ≤ 1 ,25 ns.
This characteristic is calculated from the individual propagation delay measurements and, as with propagation delay (6.3.4), it is assumed that connectors comply by design.
6.3.6 NEXT loss
Conditions.
IEC 6051 2, test 28c.
Mated connectors.
All pair combinations: ≥ 94-20 log (f) dB from 1 MHz to 250 MHz.
(unless limits are specified by IEC 6051 2-28-1 00 ED 2)
All pair combinations: ≥ 46,04 -30 log(f/250) dB from 250 MHz to 500 MHz.
(unless limits are specified by IEC 6051 2-28-1 00 ED 2)
All pair combinations: ≥ 37,0-40 log(f/500) dB from 500 MHz to 2 000 MHz.
(unless limits are specified by IEC 6051 2-28-1 00 ED 2)
Whenever the formula results in a value greater than 80 dB, the requirement shall revert to 80 dB.
6.3.7 Power sum NEXT loss
This characteristic is given for information only.IEC 60603-7-81 pdf download.