Technical Specification
Sonifex HY-03 User Handbook
11
Approvals Information
Sonifex is a BABT approved manufacturing facility with a license to build telecommunications equipment and all telecom
products are compliant with BS6301, BS7002, BS415 and CTR21. The following product description is necessary for BABT
approval and provides information on the connection and operating conditions of the units.
Manufacturer
Sonifex Limited,
61 Station Road,
Irthlingborough,
Northants,
NN9 5QE
United Kingdom
Equipment Type
HY-03 telephone balance unit.
BABT Approval Numbers
HY-03 : S/3619/23/L/501792
Functions
The HY-03 Telephone Balance Unit is suitable for connection to B.T. exchange lines with a series connected telephone at
the handset port. The hybrid unit is used as a four wire to two wire converter. Incoming calls received at the handset may
be diverted to the hybrid unit and produce a ‘telephone’ signal at the output of the unit. Signals presented at the input are
transmitted to the telephone line only. The HY-03 automatically balances the telephone line.
Specified Systems
The HY-03 is suitable for connection to any exchange line forming part of a Public Switched Telephone Network, PSTN, or a
Relevant Branch system for PSTN lines or any extension. This equipment is not suitable as an extension to a payphone. A
definition of Relevant Branch System for PSTN is given in BS6789 : Section 6.1 : 1986 Clause 2.9; including the note to
that clause.
Ringer Equivalence Number
The REN=1 marking on the rear of this equipment relates to the performance of the apparatus when used in combination
with other items of apparatus.
The REN indicates the maximum number of items that should be connected simultaneously to the line. This equipment
may be connected with series apparatus up to REN = 4 maximum.
Accessory Ports
Barriered Ports - The Handset series connection complies with BS6301.
Accessory Ports - Mic/Line Input
Output
Remotes
Conditions
This apparatus is not designed for use under controlled conditions of temperature and relative humidity.
Series Connection
When connected into the loop connection between the main apparatus and the PSTN, this apparatus introduces a voltage
drop at a current of 40mA of 0.300V.
The apparatus should not be used in conjunction with other series connected apparatus such that the aggregate declared
voltage drops, together with that of any relevant wiring at 40mA, exceeds 2.0 volts.
Facilities
This apparatus has been approved for use as a telephone hybrid unit (four wire to two wire converter) and for use with a
series connected simple telephone. Any other usage will invalidate the approval of the apparatus if as a result it then
ceases to comply with the standards against which approval was gained.
Statutory Mark
Approved for connection to telecommunications systems specified in the instructions for use subject to the conditions set
out in them.
