Sonifex HY02 DIGITAL, User Handbook Manual

Page: 7 / 28

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.