TN151 Base Station Interface Connections
MT-4 Radio Systems
TECHNICAL NOTES
Page 1 of 2
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TN151, REV 2-0-0, © Nov 2018
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Base Stations can be interfaced to a console, or console network through a variety of technologies that have
changed considerably over the years.
Analog Tone Remote Interface
An Analog Tone Remote Interface provides a means of remotely controlling base stations by any voice grade
transmission medium such as a microwave link, a leased telephone line, or a twisted-pair 600-ohm line. An
industry-standard sequential tone keying format is generated by the console and is sent over the transmission
medium to a tone remote adapter that is capable of decoding the PTT tone sequence and the voice-plus-tone
signals. The tone portion of the voice-plus-tone signal is removed from the transmitted voice by the adapter. A tone
remote base station interface is shown in Figure 1.
Figure 1: Analog Tone Remote Interface
IP Network Remote Interface
An IP Network Remote Interface provides a means of remotely controlling base stations by any available Wide
Area Network (WAN) or Local Area Network (LAN) IP connection. This creates a Radio over IP (RoIP) network to
allow any Telex IP based console to communicate with the Telex IP Network adapter. Audio and control information
is encoded and decoded in a proprietary format over the network and converted back to analog audio and control
information (PTT) at the interface between the base station and adapter. The Telex IP network solution provides
voice and control over IP, but it is not end-to-end digital, or open standard. An IP network remote base station
interface is shown in Figure 2.
Figure 2: IP Network Remote Interface
In an analog tone remote and IP network remote, all P25 Digital communications are vocoded and de-vocoded at
the base station. This means that the interface does not support end-to-end encryption, P25 Digital ID’s or packet
data, to or from the console and base station.
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
SYSTEM REGULATOR
MADE IN CANADA
VOL METER
+
-
ON
OFF
SPKR
INT
EXT
EXT
SPKR
ANTENNA A
RX A
TX A
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
P25 BASE
CONTROL
BNK
PULL DOWN
TO REMOVE
5
9
13
RX A
A
B
BNK
5
9
13
TX A
A
B
TX A TX B
Secure
Clear
Zeroize
Key
Local
Disable
Enable
TELEX
PROGRAMMING PORT
DSP-223
PTT IC
HANDSET
POWER PTT MONITOR
FUNCTION
C
TC
S
S
L
IN
E
RX
L
IN
E
TX
+
R
A
D
IO TX
+
R
A
D
IO R
X
LIN
E TX
LIN
E R
X
R
A
D
IO
TX
R
A
D
IO R
X
C
TC
S
S
R
A
D
I
O
TX
-
GR
OU
N
D
L
IN
E
TX
-
NALOG TONE REMOTE
CONSOLE
ANALOG 2 OR 4 WIRE AUDIO AND TONES
(LEASED TELEPHONE LINES)
ANALOG AUDIO INTERFACE
TELEX DSP-223 TONE
REMOTE ADAPTER
CODAN RADIO SYSTEM WITH AUDIO CARD
OR BASE CONTROL CARD
P25 DIGITAL OR
ANALOG SUBSCRIBER
COMMON AIR
INTERFACE
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
SYSTEM REGULATOR
MADE IN CANADA
VOL METER
+
-
ON
OFF
SPKR
INT
EXT
EXT
SPKR
ANTENNA A
RX A
TX A
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
P25 BASE
CONTROL
BNK
PULL DOWN
TO REMOVE
5
9
13
RX A
A
B
BNK
5
9
13
TX A
A
B
TX A TX B
Secure
Clear
Zeroize
Key
Local
Disable
Enable
IP-223
TX
LNK
LINE
HANDSET
R
X
GND
TX+
IC
TX-
T
X
RX
TX
TX+
T
X-
RADIO 1 RADIO 2
TELEX
TELEX IP BASED
CONSOLE
ANALOG AUDIO INTERFACE
TELEX IP-223 OR IP-224
IP REMOTE ADAPTER
TELEX PROPRIETARY DIGITAL IP INTERFACE
CODAN RADIO SYSTEM WITH AUDIO CARD
OR BASE CONTROL CARD
P25 DIGITAL OR
ANALOG SUBSCRIBER
COMMON AIR
INTERFACE
LAN / WAN
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