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SECTION\ 5
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\fBAUDIO\(hyFREQUENCY\ CIRCUITS\fR 
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.PP
The Recommendations under subsections\ 5.1, 5.2 and\ 5.3 have been   deleted.
.EF '%	Fascicle\ III.2\ \(em\ Section\ 5''
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\fB5.4\fR \fBSpecifications recommended by the CCITT for\fR \fBaudio\(hyfrequency 
cable circuits\fR 
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	INTRODUCTION
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.PP
The CCITT recommends Administrations to use the following
specifications for the supply of audio\(hyfrequency telecommunication cables
liable to be used in the international service (and also auxiliary equipment: 
loading coils, repeaters,\ etc.). 
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.PP
In these specifications, only the clauses relating to 4\(hywire
circuits apply to international telephone circuits on loaded cables. All the
specifications apply to national trunk circuits liable to enter into an
international call, these being either 2\(hywire or 4\(hywire circuits.
.PP
The CCITT considers that the efficiency of such a long\(hydistance cable 
(with several repeater stations) depends to a large extent on constructional 
details and the general arrangement of the system.
.PP
An Administration might prefer to place a contract with a firm for a complete 
system (cable and repeaters) instead of having their own specialist 
engineers assume the responsibility, which results from acceptance of the 
parts of the system separately. The CCITT proposes to recommend to such 
an 
Administration to obtain from the contractor detailed information regarding 
the project and to obtain all the necessary guarantees to ensure strict 
adherence 
.PP
to the outline specification below. The Administration should give prior
information to the contractor regarding the circuits necessary and estimated
traffic.
.PP
Certain Administrations include in their specifications for
underground cables details of methods of manufacture, laying, etc. These are
not included in the following specifications, because the CCITT considers 
it is better to leave the various Administrations free to choose their 
own methods 
for manufacture and laying of cables, with the reservation that the complete
circuits should satisfy the general conditions shown in
Recommendation\ G.511\ [1].
.PP
(See also the Annex to Recommendation\ G.543, headed \*QDifferent methods 
of cooperation between two Administrations for the construction of a loaded 
cable section crossing a frontier\*U\ [2].)
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	\fBReferences\fR 
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[1]
	CCITT Recommendation \fIGeneral characteristics of audio\(hyfrequency\fR 
\fIcircuits\fR , Orange\ Book, Vol.\ III\(hy1, Rec.\ G.511, ITU, Geneva,\ 1977.
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[2]
	CCITT Recommendation \fISpecification for repeater sections of loaded\fR 
\fItelecommunication cable\fR , Orange\ Book, Vol.\ III\(hy1, Rec.\ G.543, ITU,
Geneva,\ 1977.
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\fBRecommendation\ G.541\fR 
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\fBSPECIFICATION\ OF\ FACTORY\ LENGTHS\ OF\ LOADED\fR 
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\fBTELECOMMUNICATION\ CABLE\fR \v'2P'
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\fBRecommendation\ G.542\fR 
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\fBSPECIFICATION\ OF\ LOADING\ COILS\ FOR\ LOADED\fR 
.EF '%	Fascicle\ III.2\ \(em\ Rec.\ G.542''
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\fBTELECOMMUNICATION\ CABLES\fR \v'2P'
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\fBRecommendation\ G.543\fR 
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\fBSPECIFICATION\ FOR\ REPEATER\ SECTIONS\fR 
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\fBOF\ LOADED\ TELECOMMUNICATION\ CABLE\fR \v'2P'
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\fBRecommendation\ G.544\fR 
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\fBSPECIFICATIONS\ FOR\ TERMINAL\ EQUIPMENT\ AND\fR 
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\fBINTERMEDIATE\ REPEATER\ STATIONS\fR 
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.PP
The four Recommendations listed above are in Volume\ III of the \fIOrange\ 
Book\fR . In these Recommendations, the characteristics of audio\(hyfrequency 
cable circuits are specified and these are useful for the design of cables, 
e.g.,\ interstice quad of coaxial cable.
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