Sonifex HY02 DIGITAL Instruction Manual

HY02 DIGITAL AUTOMATIC
TELEPHONE BALANCE UNIT
USER HANDBOOK
DHY 02EC Single automatic TBU, eurocard version.
SONIFEX LTD, 1995.
All Rights Reserved
Revision V1.00a, 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.

Connection of Apparatus to
BT Lines
Equipment Type : Sonifex HY02 Digital Eurocard Telephone Balance Unit
BABT Approval Number : S/3619/23/L/501793
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 Eurocard Telephone Balance Unit
BABT Approval Number : S/3619/23/L/501793
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 ..............................

Warranty and Safety Information Page i
HY02 Digital Eurocard TBU User's Guide
Warranty And Safety Information
Warranty Registration
HY02 Digital Eurocard 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 Eurocard 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 card in accordance with the connection details and before applying
power to it, check that the power supply used has the correct operating voltage.

Page ii Warranty and Safety Information
HY02 Digital Eurocard 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 power supply used has the correct operating 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 HOST UNIT INTERFACE
and 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 pins on the connector on the
rear of the card, 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.
WARNING : The B.T. plug should be disconnected from the telecommunications network
exchange line before removing the equipment covers.

Warranty and Safety Information Page iii
HY02 Digital Eurocard TBU User's Guide
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 Eurocard 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 eurocard, see the label on the edge connector of the card .
HY02 Digital 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

Introduction & Installation Page 1-1
HY02 Digital Eurocard TBU User's Guide
1. Introduction & Installation
1.1. Introduction
The HY02 Digital telephone hybrid is a series of equipment presented as rack
mounted single and twin channel units, or as a single channel eurocard. A single channel ringing
detector is also available :
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.
RD 02EC Eurocard ringing detector for use with DHY 02EC
This handbook covers the DHY 02EC, eurocard version. If you are using the
eurocard TBU without the ringing detector card connected, please ignore the section of this handbook
which deals with ringing detector. The serial number of this unit can be found on the connector at the
rear of the card.
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.

Page 1-2 Introduction & Installation
HY02 Digital Eurocard TBU User's Guide
Both the input and the output are transformer balanced providing complete isolation.
The unit has a line connect control facility and the equipment is fitted with K-break and dial tone
disconnect as standard. All connections are via DIN 41612 Type B, 32 way ‘A’ loaded edge connector.
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 :
1.2.1. Manufacturer
Sonifex Limited,
61 Station Road,
Irthlingborough,
Northants,
NN9 5QE
United Kingdom
1.2.2. Equipment Type
HY02 Digital Eurocard telephone balance unit.
1.2.3. BABT Approval Number
S /3619/23/L/501793
1.2.4. Functions
The HY02 Digital Eurocard Telephone Balance Unit is suitable for use with the Host
Unit Interface 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
Eurocard 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 front 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.

Introduction & Installation Page 1-3
HY02 Digital Eurocard TBU User's Guide
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
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 telephoneor ringing detector type RD
02EC. 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 ± 15V regulated.
Dimensions Eurocard : 160mm, Height 3U, Width 8E
Connections 32 Way Din 41612 Type B, ‘A’ loaded

Page 1-4 Introduction & Installation
HY02 Digital Eurocard 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.
The telephone line NTTP port should be connected using a 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 a handset connector BT 605A.
The 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 needs ±15V dc to power the electronic hybrid processor from a
230V, 50Hz ac supply. The earth connection provided at the rear of the equipment provides protection
for the user against dangerous line fault conditions. A Remote Line Connect ( Divert ) switch should
be connected to control the acceptance and release of calls.
There are jumper gain controls available to the user for setting both the Receive and
Transmit levels through the equipment.
If connecting the DHY 02EC eurocard to a eurocard ringing detector, please
configure the connections as per Figure 1-2.