8
© MiMOMax 2013 Four Wire Audio
Interface Manual
2.2
C
ONNECTIVITY
Connector
Description
12
– 48 Vdc
Input Power
HSSI-B
(Shielded RJ45)
Not Used (Intended for future enhancements)
HSSI-A
(Shielded RJ45)
Connection to Radio Unit
COM
(Shielded RJ45)
UART Port
(EIA232 end-to-end site communications)
Available in 3 and 7 channel Modes (NOT available in Fixed Mode).
1
(Shielded RJ45)
Audio Port One
Available in 3 and 7 channel modes (either static or dynamic operation).
Available in Fixed channel mode.
2
(Shielded RJ45)
Audio Port Two
Available in 3 and 7 channel modes (either static or dynamic operation).
Available in Fixed channel mode.
3
(Shielded RJ45)
Audio Port Three
Available in 7 channel Mode ONLY (either static or dynamic operation).
4
(Shielded RJ45)
Audio Port Four
Available in 7 channel Mode ONLY (either static or dynamic operation).
5
(Shielded RJ45)
Audio Port Five
Available in 7 channel Mode ONLY (either static or dynamic operation).
6
(Shielded RJ45)
Audio Port Six
Available in 7 channel Mode ONLY (either static or dynamic operation).
2.3
C
ONFIGURATION
Three basic modes of operation are provided; 7 channel, 3 channel and fixed channel. Each
of these modes will define the number of simultaneous audio channels able to operate.
Additionally channels may operate in either dynamic (E & M signalled) or static (always up)
configurations.
Static audio channels pass continuously without an E-Lead signal and the M-Lead signal is
continuously activated. Static channels have a set bandwidth requirement. Dynamic audio
channels are E-Lead controlled where the corresponding M-Lead reflects the state of the E-
Lead. Dynamic channels only consume bandwidth when set as active by the E-Lead signal.
The bandwidth requirement of any selection must be compatible with the supporting radio link
(see Section 2.5
).
2.3.1
7 Channel Mode
(6 audio channels plus a data channel plus Control Header)
Audio channels are either always on (static) or controlled via E&M signalling (dynamic). E&M
signalling requires an E-Lead signal for audio to pass.
The data channel passes COM port data as required with the nominal throughput defined by
the UART rate.
