Oki FAX 740 - Manual (Page 75)

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(iii) Such that any apparatus which forms part of the RBS
or is connected via it, is so connected that no signals of
any kind may be conveyed between that apparatus and
a PSTN circuit or vice-versa, except by means of other
apparatus that does not materially affect the electrical
conditions presented to one another by that apparatus
and the PSTN.
Further information is contained in the proposed British
Standard for RBS to PSTN lines.
TEL/FAX Change Over
When the OKIFAX 740 is in changeover mode, care must
be taken to ensure that you only connect the apparatus to
telephone lines not listed in the telephone directories issued
by the Public Telephone Network Operators.
The telephone number of this apparatus should not be issued
to other parties without instructions concerning the correct
method of making calls to this apparatus.
While operation may be possible initially, changes to or
modernisation of the network taking place in the normal
course of events may result in the apparatus being connected
to a network service with which it was not designed to be
compatible. Failure of the apparatus to work under these
circumstances may not be the responsibility of the network
operator.
If such difficulties are experienced, please consult your
OKIFAX supplier.
NOTE 2
A Relevant Branch system (RBS) is a telecommunication
system other than a public telecommunication system that
is:-
(i) Run under a license granted or having effect under
section 7 of the Telecommunications Act 1984.
(ii) Connected to one or more PSTN lines.