Local ptt i/o, Cross mute i/o, Supervisory i/o – Telex IP-223 User Manual
Page 28: Level adjustments, Ocal, Ptt i/o, Ross, Upervisory
Installation and Level Settings
30
Local PTT I/O
The Local PTT I/O is used to generate TX Ethernet traffic on a local keyed system as opposed to the 2175Hz detection on a
tone keyed system. The input is at DIG5; pin 23 of the DB25 connector. The TX condition is caused by an active low.
Cross Mute I/O
Cross mute information to local consoles is provided at DIG0, pin 8 of the DB25 connector.
Supervisory I/O
Supervisory information to and from consoles is provided at DIG1, pin 21 of the DB25 connector. The supervisory I/O is both
an input and an output.
Supervisory input and output in console, tone or local mode behaves as follows:
Console Mode –
Input - An Ethernet packet supervisor is sent on detection.
Output - When an Ethernet packet is received. The line level is set.
While under supervisory control, TX traffic from the Ethernet to the console is muted. The console’s
audio to the Ethernet is muted. Handset PTT and the IC button are disabled.
Tone Mode –
Input - An Ethernet packet supervisor is sent on detection.
Output - When an Ethernet packet is received, the line level is set.
When an Ethernet packet is received, the line level is set.
Local Mode -
Input- No affect on I/O.
Output - No affect, when Ethernet packet is received.
While under control, manual PTT and the IC button are disabled.
NOTE:
Information on programming the supervisory I/O is provided in the “Setup Information” chapter of this manual
starting on page 33..
Level Adjustments
Once the IP-223 unit is connected to the system, the level potentiometers can be set. Access to test and adjustment points on
newer versions of the IP-223 are provided through labeled openings on the case top and on the front panel of the unit. On older
versions of the IP-223, access to some of the test and adjustment points is provided through labeled openings on the front
panel; however, the case top needs to be opened to access the other test and adjustment points.
Jumper Position
Line 1
Line 2
Consoles in Parallel:
J17
J22
J10
J15
Output Impedance
1
B
B
B
B
600 ohms
2
A
B
A
B
1200 ohms
3
B
A
B
A
1800 ohms
4
A
A
A
A
2400 ohms