Sonifex HY02 DIGITAL Instruction Manual

HY02 DIGITAL AUTOMATIC
TELEPHONE BALANCE UNIT
USER HANDBOOK
DHY 02S Single automatic TBU, rack mounted with PSU.
DHY 02T Twin automatic TBU, rack mounted with PSU.
DHY 02SR Single automatic TBU, with ringing detector.
DHY 02TR Twin automatic TBU, with ringing detector.
SONIFEX LTD, 1995.
All Rights Reserved
Revision V1.00c, June 1995
61, Station Road, Irthlingborough,
Northants., NN9 5QE, England.
Tel : [phone]
Fax : [phone]
Information in this document is subject to change without notice and does not represent a commitment on the part of Sonifex Ltd. No
part of this manual and/or databases may be reproduced or transmitted in any form or by any means, electronic or mechanical,
including photocopying, recording, or information storage and retrieval systems, for any purpose other than the purchaser’s personal
use, without the express written permission of Sonifex Ltd.
Unless otherwise noted, all names of companies, products and persons contained herein are part of a completely fictitious adaptation
and are designed solely to document the use of Sonifex products.

Warranty and Safety Information Page i
HY02 Digital TBU User's Guide
Warranty And Safety Information
Warranty Registration
HY02 Digital TBU
Warranty Details
The HY02 Digital audio product is guaranteed for 12 months from the date of
purchase.
The components and materials used are guaranteed against defects and faulty
workmanship. Sonifex undertake to replace or repair faulty items at its discretion, within the warranty
period, on a return to factory basis.
In addition, the HY02 Digital product is a complex microprocessor controlled
machine. In order to register the date of purchase it is important to complete the WARRANTY
REGISTRATION DOCUMENT and return it to :-
Sonifex Ltd,
61, Station Road,
Irthlingborough,
Northants.,
NN9 5QE
ENGLAND
The registration document carries the following information for servicing :-
SERIAL NUMBER DHY______
COUNTRY CODE E A U O
Safety Of Mains Operated Equipment
HY02 Digital TBU
Preparing the Machine for Use
Each HY02 Digital TBU is shipped in protective packaging and should be inspected
for damage before use. Where an item is found to have transit damage, notify the carrier immediately
with all the relevant details of the shipment. Packing materials should be kept for inspection.
Connect the equipment in accordance with the connection details and before
applying power to the unit, check that the machine has the correct operating voltage for your mains
power supply.

Page ii Warranty and Safety Information
HY02 Digital TBU User's Guide
Equipment Safety
This equipment has been designed to meet the safety regulations currently advised in
the country of purchase.
It is important to connect the mains supply in accordance with the information given.
SEE BELOW. Ensure that the rear panel mains voltage statement indicates that your equipment is
suitable for your mains supply voltage and that the mains supply fuse is correctly rated. The fuse as
supplied is correct for the voltage setting.
WARNING: This apparatus is intended for use when powered by the HY02-B power supply unit.
Other usage will invalidate any approval given to this apparatus if, as a result, it ceases to comply with
the edition of BS6301 to which it was approved.
WARNING: The equipment B.T. plug should only be connected with apparatus complying with
BS6301 and the connection to the network must not be hard wired. Interconnection directly or
indirectly with equipment ports marked in accordance with BS6301 to unmarked ports may produce
hazardous conditions on the network and advice should be obtained from a competent engineer before
such a connection is made.
WARNING: This apparatus must be earthed by means of the earth connector on the rear panel,
and the B.T. plug should be disconnected from the telecommunications network before disconnecting
the earth. Disconnection of this earth connection may render the equipment unsafe, with a
consequential possible electrical shock hazard from exposed metallic parts.
WARNING: The barriered ports ‘NTTP’ and ‘Handset’ must not be connected directly or
indirectly to the unbarriered ports, ‘Line Input’, ‘Line Output’, or ‘Remotes’.
This equipment conforms to the safety regulations specified by use of the CE
Mark.
Voltage Setting Checks
The rear panel of the equipment carries the Serial Number of the machine. The
operating voltage of the HY02 Digital is selectable by a switch on the power inlet port. Ensure that the
machine operating voltage is correct for your mains power supply. The safety specification of your
HY02 Digital complies with local requirements and must be earthed through the mains connector. The
available voltage settings are : -
110V Code A
230V Code E
Power Cable and Connection
For Class 1 apparatus, the IEC power connector or power lead provided must be
connected as follows. The mains lead wires supplied with the equipment are coloured in accordance
with the following code : -
Green - Earth
Blue - Neutral
Brown - Live
As the colours of the wires in the mains lead may not correspond with the coloured
markings identifying the terminals of your plug, proceed as follows :-
Green and Yellow wire - must be connected to the terminal marked with E the colour green or
green- yellow.

Warranty and Safety Information Page iii
HY02 Digital TBU User's Guide
Blue wire - must be connected to the terminal marked N or coloured black.
Brown wire - must be connected to the terminal marked L or coloured red.
Important Note : The terminal marked on the rear panel must be earthed.
Fuse Rating
The HY02 Digital is supplied with a single fuse in the live conducting path of the
power infeed at the power supply. For reasons of safety it is important that the correct rating and type
of fuse is used.
Incorrectly rated fuses could present a possible fire hazard, under equipment fault
conditions. The fuse ratings for HY02 Digital are :-
Country code A 110 V operation - 200mA 5 x 20mm SB.
Country code E 230 V operation - 100mA 5 x 20mm SB.
The active fuse is fitted at the power supply on the outside of the unit.
Removing the Covers
WARNING : The power must be switched off at the supply or the power lead must be
disconnected before attempting to remove the panels or cover. Removal of the panels and cover can
expose dangerous voltages.
WARNING : The B.T. plug should be disconnected from the telecommunications network
exchange line before removing the equipment covers.
Limitation of Liability
Limited Warranty - Sonifex warrants that (a) the HY02 Digital SOFTWARE will
perform substantially in accordance with the accompanying Product Manual(s) for a period of 90 days
from the date of receipt; and (b) any Sonifex supplied hardware accompanying the SOFTWARE will
be free from defects in materials and workmanship under normal use and service for a period of one
year from the date of receipt. Any implied warranties on the SOFTWARE and hardware are limited to
90 days and one (1) year, respectively, or the shortest period permitted by applicable law, whichever is
greater.
Customer Remedies - Sonifex's entire liability and your exclusive remedy shall be, at
Sonifex's option, either (a) return of the price paid or (b) repair or replacement of the SOFTWARE or
hardware that does not meet Sonifex's Limited Warranty and which is returned to Sonifex with a copy
of your receipt or invoice. This Limited Warranty is void if failure of the SOFTWARE or hardware has
resulted from accident, abuse, or misapplication. Any replacement SOFTWARE will be warranted for
the remainder of the original warranty period or 30 days, whichever is longer.
No other warranties - To the maximum extent permitted by applicable law, Sonifex
disclaims all other warranties, either express or implied, including but not limited to implied warranties
or merchantability and fitness for a particular purpose, with respect to the SOFTWARE, the
accompanying product manual(s) and written materials, and any accompanying hardware. The Limited
Warranty contained herein gives you specific legal rights.
No Liability for Consequential Damages - To the maximum extent permitted by
applicable law, Sonifex and its suppliers shall not be liable for any other damages whatsoever
(including, without limitation, damages for loss of business profits, business interruption, loss of
business information, or other pecuniary loss) arising out of the use of or inability to use this Sonifex
product, even if Sonifex has been advised of the possibility of such damages. In any case, Sonifex's
entire liability under any provision of this agreement shall be limited to the amount actually paid by
you for the SOFTWARE. This Agreement is governed by the laws of England.
Sonifex Ltd can not be held liable for any loss of audio data due to equipment failure.

Page iv Warranty and Safety Information
HY02 Digital TBU User's Guide
Faults Sheet
Although this Sonifex product is manufacture to the highest standards, it is possible
that minor faults may appear in the equipment over its normal lifetime. If you find any problems with
the HY02 Digital, please contact your Sonifex distributor, or contact Sonifex directly at the following
address, or fax with a copy of this completed sheet :
To : Sonifex Ltd, From: Name .......................................................
61, Station Road, Position .......................................................
Irthlingborough, Company .......................................................
Northants. Address .......................................................
NN9 5QE, UK .......................................................
.......................................................
Tel : [phone] Tel .......................................................
Fax : [phone] Fax .......................................................
For the Serial No. of your machine, see the back panel of the HY02 Digital unit.
HY02 Digital Serial No. HY02 Digital Power Supply Serial No.
Please describe the error in as much detail as possible ( for example what you were
doing when the problem occurred, what actually happened, etc).
Description of HY02 Digital Error
Also, if you have any suggestions for additions or upgrades to the HY02 Digital unit , we would like to
hear what they are :
Additions that I Would Like to See

Connection of Apparatus to
BT Lines
Equipment Type : Sonifex HY02 Digital Telephone Balance Unit
BABT Approval Number : NS/3619/123/L/601748
This apparatus is suitable for connection directly to the network by
means of the cable mounted plug provided. If you require an appropriate BT socket,
or sockets, installed in order to use this equipment then this form should be sent to
your local telephone area office.
Name .........................................................................................................
Company .........................................................................................................
Address .........................................................................................................
.........................................................................................................
.........................................................................................................
.........................................................................................................
Equipment Type : Sonifex HY02 Digital Telephone Balance Unit
BABT Approval Number : NS/3619/123/L/601748
To British Telecom Area Office :
Please supply a BT line socket for connection of the above apparatus to :
A new line An existing line
at the above address. The appropriate equipment details are as above.
Signed ..................................... Date ..............................

Introduction & Installation Page 1-1
HY02 Digital TBU User's Guide
1. Introduction & Installation
1.1. Introduction
The HY02 Digital telephone hybrid is a series of equipment presented as either a
single channel unit or a twin channel unit mounted within a 1U high 19” rack frame.
DHY 02S Single automatic TBU, rack mounted with PSU.
DHY 02SR Single automatic TBU, with ringing detector, rack mounted with PSU.
DHY 02T Twin automatic TBU, rack mounted with PSU.
DHY 02TR Twin automatic TBU, with ringing detector, rack mounted with PSU.
DHY 02EC Eurocard version, without ringing detector.
This handbook covers the first four pieces of equipment in the above list. In each
case the power supply is separately encased within the rack and is connected to the telephone hybrid
processor by means of short link cables. The twin channel unit incorporates two separate power
supplies within the same enclosed chassis. For the DHY 02S and DHY 02T units, please ignore the
section of this handbook which deals with ringing detector, which is not installed in these units. To
find out if you have the ringing detector version of the equipment, please check the Serial Number on
the rear panel. If the Serial No. is of the format DHYR#### ( instead of DHY#### ), then the unit is
installed with the ringing detector.
1.2. Description
The telephone hybrid is a two wire to four wire converter which provides the
interface between a caller on the telephone line and the input to the mixing desk. Built to a very high
specification, it is simple to install and automatically adapts to line conditions and programme content.
Analogue signal limiting, controlled from the DSP, is used in the send and receive paths to ensure that
signal break-up and severe overload problems do not occur.
The unit has independent LED bar graph metering of send and receive levels with
input and output gain controls provided at the front panel. Both the input and the output are
transformer balanced providing complete isolation.
The illuminating line connect control has a remote facility and the equipment is fitted
with K-break and dial tone disconnect as standard. Audio connectors are the standard XLR-3 type.
By using a high power DSP and a high quality 16 bit dual codec, the HY02 Digital
gives some of the best audio figures available - it provides full adaptive echo cancellation to 28msec
and gives unwanted sideband rejection figures of 69dBu on tone, reference peak output of +8dB. The
HY02 Digital has been designed to achieve the best possible audio performance from a telephone line.
The unit ensures that the dynamic range is as large and the distortion and noise are as small as possible.
The following product description is necessary for BABT approval and provides
information on the connection and operating conditions of the units.

Page 1-2 Introduction & Installation
HY02 Digital TBU User's Guide
1.2.1. Manufacturer
Sonifex Limited,
61 Station Road,
Irthlingborough,
Northants,
NN9 5QE
United Kingdom
1.2.2. Equipment Type
HY02 Digital telephone balance unit.
1.2.3. BABT Approval Number
Apparatus power supply : NS/3619/123/L/601748
1.2.4. Functions
The HY02 Digital Telephone Balance Unit is suitable for use with the HY02 power
supply 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. 0dB
signals presented at the line input are transmitted to the telephone line only. The HY02 Digital
automatically balances the telephone line.
1.2.5. Specified Systems
The HY02 Digital 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 a Relevant Branch System for PSTN is given in BS6789 : Section
6.1: 1986 clause 2.4 including the NOTE to that clause.
1.2.6. 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.
1.2.7. Accessory Ports
1.2.7.1 Barriered Ports
The Handset series connection complies with BS6301.
1.2.7.2 Accessory Ports
a) Line Input
b) Line Output
This equipment is provided with a line cord and BT plug to BS6312 and is internally
wired as specified in BS6305 1982.

Introduction & Installation Page 1-3
HY02 Digital TBU User's Guide
1.2.8. Conditions
This apparatus is not designed for use under controlled conditions of temperature and
relative humidity.
1.2.9. Series Connection
This apparatus when connected into the loop connection between the main apparatus
and the PSTN 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.
1.2.10.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.
1.2.11.Statutory Mark
Approved for connection to telecommunications systems specified in the instructions
for use subject to the conditions set out in them.
1.3. Specification
Feature Value
Clean feed input line 10kΩbalanced 0dB
Clean feed limiting input +6dBu
Bandwidth to Telephone line 250Hz - 3500Hz, -3dB ref 1kHz
Telephone line impedance Nominally 600ohm, reactive
Telephone line impedance range 300Ωto 1500Ω
Output Balanced floating 0dBu 50Ω
Rejection Ratio Typically 69dB reference peak level of +8dB
Echo Cancellation Network cancellation to 28msec
Power 230V 50Hz
Connections :
Input line XLR 3 pin female ( XLR-3-31 10K ohm balanced floating )
Output line XLR 3 pin male ( XLR-3-32 50 ohm balanced floating )
Telephone line NTTP BT6/502 cord plug ( plugs into standard line jack socket )
Telephone instrument BT605A socket ( accepts standard telephone plug )
Remotes 5 way IP40
Power IEC mains ( CEE22 ) 230V 50Hz
Earth Bond Screw Screen terminal bond to earth

Page 1-4 Introduction & Installation
HY02 Digital TBU User's Guide
1.4. Installing the HY02 Digital TBU
Connect the power and earth connections as per the information given in the
Warranty and Safety Information section of the handbook. The hybrid unit should be connected with
reference to Figure 1-1 below which shows the connections for a twin hybrid. If you are using a single
hybrid, please ignore the connections to DHY02 Hybrid Unit 2.
The telephone line NTTP port may be directly connected using the BT 6/502 cable
mounted connector into a suitable BT wall jack socket. A simple telephone handset can be used to take
and make calls when plugged into the equipment handset connector BT 605A. Some versions of this
equipment will be supplied with variations of the telephone line or handset connectors.
The connector labelled Line Input is balanced bridging and will accept normal
signals at 0dBu peaking to +8dBu from a sound mixer ‘clean feed’. The input circuitry to the HY02
Digital has a very effective limiter which will prevent high level overloading problems.
The Line Output connection will deliver a balanced/floating low impedance signal of
0dBm from the telephone line. The output of the digital hybrid unit is normally 0dBu from a balanced
source of 50 ohms or less across the useful bandwidth of the equipment. The bandwidth is restricted
by the line conditions between 250 Hz and 3.5 kHz. The output stage is capable of driving into 600
ohm loads at up to +8dBu. It is not necessary to terminate this output.
Isolation of better than 69dB is created between the input and output connectors
when the hybrid unit is functioning on an exchange line. The equipment may require some adjustment
to work with PBX systems.
The power supply creates ±15V dc to power the electronic hybrid processor from a
230V, 50Hz ac supply. The power unit has an overvoltage protected output and is fully isolated and
totally enclosed. Earth bonding from the IEC power connector is carried through the connection cable
and multiway socket to the electronic hybrid processor unit. The earth terminal at the rear of the
equipment provides protection for the user against dangerous line fault conditions. A remote divert
switch may be connected at the Remotes socket.
There are external preset gain controls available to the user for setting both the
Receive and Transmit levels through the equipment.
The earth bond at the screw terminal must be connected to a technical earth to
ensure the safe operation of the equipment under all line conditions.