Case Communications syncro 1496, Справочное руководство

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g) This modem may be used on circuits with British Telecom signalling
at a nominal frequency of 2280 Hz.
h) This modem does not require signalling or otherwise employ the
frequency range DC to 200 Hz.
i) This modem does not require DC from the British Telecom Private
Speech Band Circuit for correct operation.
j) The approval of this modem for connection to the British Telecom
PSTN or Private Speech Band Circuits is INVALIDATED if the
apparatus is subject to modification in any material way not
authorised by BABT or if it is used with, or connected to:
i) Internal software that has not been formally accepted by BABT.
ii) External control software or external control apparatus which
causes the operation of the modem or associated call set-up
equipment to contravene the requirements of the standard set
out in BABT/SITS/82/005S/D and BABT/SITS/82/01/C.
k) All apparatus connected to this modem and thereby connected
directly or indirectly to British Telecom PSTN or Private Speech
Band Circuits must be approved apparatus as defined in Section 22 of
the British Telecommunications Act 1984.
Ringer Equivalence
This modem has a ringer equivalence number (REN) of 3.0.
REN is a guide to the maximum number of pieces of apparatus (e.g.
modems, telephones etc) that can be simultaneously connected to one
telephone line. The REN value of each is added together and must not
exceed 4.
Unless otherwise marked, a telephone supplied by BT can be assumed to
have a REN of 1.
Automatic Dialling
a) This modem is a mode 1 device, and initiates repeat call attempts in
accordance with call pattern B of BS6789; Part 3.1.
b) Always ensure that numbers entered during the automatic dialling
set-up phase are correct prior to dialling.
X450-310851 Issue 2 C-3 Rev.0