AN-DISPATCH-036
3
1.0 General
This application note is intended to show how to configure and connect the Telex Radio Dispatch
IP-223 Ethernet Adaptor Panel to a Telex HB-3+ Headset Adaptor. This connection provides
PTT
(Push-To-Talk) control and audio connections for an intercom position to listen and talk on a
radio network that is crosspatched by a console position.
This type of configuration allows an IP-223 to be mounted anywhere on the network with an
HB-3+ connected to one (1) of the I/O connectors, allowing up to two (2) per IP-223. The user sits
at a desk and plugs a headset into the HB-3+. Once connected, the user can talk and receive audio
from the console just like radio communications.
Dispatchers at any console can create a crosspatch between the intercom position and the desired
radio net. A simple system layout is shown in Figure 1. Each HB-3+ intercom position requires a
line on the console. The example in figure 1 requires four (4) lines on the C-Soft console (2 radios
and 2 intercoms). The C-Soft dispatcher talks on either radio, but the intercom positions can only
talk on the radio they are crosspatched to.
1.1
Cable Modification
Modify the modular cable supplied with the HB-3+.
To
modify the modular cable
, do the following:
1. Cut
off
one end
of the modular cable.
2. Attach
a
DB-25M connector
using the pin outs in Table 1.
TABLE 1. DB-25 Connector Pin Outs
IP-223 Signal
IP-223 25 Pin
Modular Cable 4-Pin
HB-3+ Signal
TX+
25
4
RX
RX+
24
1
TX
COR
20
3
PTT
GND
7 & 12 & 13
2
GND
HB-3+ Headset Adapter
Connected to the IP-223
Operating as a Positional Intercom