AEV ITB302 - dual digital telephone hybrid
AEV Broadcast Srl via della Tecnica 33, 40050 Argelato (BO) ITALY
www.aev.eu
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its input in order to eliminate annoying interference. Gas discharge tubes are fitted to the
telephone lines to guarantee immunity from static charges or over-voltages.
General Description
The front panel
The front panel of AEV ITB-302 is divided into 4 sections.
The first 2 sections from the left are identical and allow control over the telephone hybrids.
Four switches with associated LED indicators perform the following functions:
1 ) 2 WIRE / 4 WIRE
Switches the hybrid of the section in use from 4 - wire to 2 - wire operation
2 ) MEETING
Puts the line into conference mode
3 ) OFF HOOK
Hangs-on the line (equivalent to picking up the handset)
4 ) 1 KHz SEND
Generates a 1 KHz note at 0 dBm for local and remote adjustment
5 )
Two level controls are situated on the input section which allow adjustment of the receive
and send transmission levels; each one fitted with a LED level display (DOT mode), and a
trimmer to adjust line levels.
The following controls are located in the third section:
6) BUZZER ON / AUTOLOCK
SWI TCH
When turning the equipment on the buzzer will be enabled alone (incoming).
Pressing the switch successively: first it enables the Autolock and Hang-up; second it disables
the buzzer but not the Autolock and Hang-up; third it disables the Buzzer, the Autolock and
Hang-up; fourth it returns to the initial position.
7 ) PANEL/ REMOTE
SWI TCH
Switches between panel control or remote control.
8 ) MEETI NG L
EVEL
Adjusts the level during conference
The line power indicator lamp is situated in the fourth section.
The rear panel
The rear panel contains all the connectors required to connect to the outside world
1 Switch POWER
Switch On/Off
2 AC POWER
Line power socket
3 REMOTE
25-way Cannon connector for remote control
4 EXPANDER 1
9-way Cannon connector for expansion
5 EXPANDER 2
9-way Cannon connector for expansion
Plus two identical sections for the two lines, comprising:
