Summary of Contents for Mimomax Four Wire Audio Interface
- Page 1 Four Wire Audio Interface Manual 2013 This document contains proprietary information that must not be provided or copied to third parties without express permission from MiMOMax Wireless Limited...
- Page 2 While precaution has been taken in the preparation of this literature and it is believed to be correct at the time of issue, MiMOMax Wireless Ltd assumes no liability for errors or omissions or for any damages resulting from the use of this information.
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Page 3: Table Of Contents
5.1.2 (HSSI) ..........23 PEED ERIAL NTERCONNECT Overview ...................... 23 5.2.1 Cabling and Connectivity ................24 5.2.2 HSSI Cross Over ..................25 5.2.3 HSSI Loop Back ................... 26 5.2.4 INSTALLATION ........................27 © MiMOMax 2013 Four Wire Audio Interface Manual... - Page 4 PRE FIRMWARE VERSION 3.00 CONSIDERATIONS ............31 LED I ................... 31 NDICATION ................31 UDIO PERATION ................... 32 ONFIGURATION 1) ..........33 PEED ERIAL NTERFACE ERSION ................. 34 ADIO ONFIGURATION TECHNICAL DATA ......................35 © MiMOMax 2013 Four Wire Audio Interface Manual...
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Page 5: Overview
Additionally a single EIA232 (UART) interface is provided for end-to-end site communications at 9600 baud. The MiMOMax Four Wire Audio interface is provided for by an add-on Network Interface Box (NIB) which communicates directly with a MiMOMax Radio Unit. The Four Wire Audio interface is able to be co-located with the Radio Unit in the standard rack mount tray. -
Page 6: High Speed Serial Interface (Hssi)
The High Speed Serial Interface (HSSI) is a proprietary synchronous serial interface developed by MiMOMax to enable Network Interface Box’s to be connected to Radio Units. The connection allows user and configuration data to pass between the two units. User data presented to the Radio Unit passes to the remote end and ultimately to the terminating Network Interface Box. -
Page 7: Operation And Configuration
Audio Port LEDs (green) Power LED (orange) HSSI LED (green) COM LED (green) Four Wire Audio Interface Front IO NDICATORS Connector located LEDs provide for indication of unit operation. The unused LEDs are disconnected and will remain off. Power LED (orange): On when power applied. -
Page 8: Connectivity
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. © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 9: Channel Mode
The units at both ends of the link must be in compatible modes. The configuration selector is a single rotary encoder placed on the PCB as shown in the following image. Configuration Selector Location of Configuration Selector © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 10: Configuration Selector Definitions
RESERVED Static audio channels do NOT require an E-Lead signal. Any additional supported dynamic channels may be used with an E-Lead signal. Fixed Channel Mode channels do NOT require an E-Lead signal. © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 11: Radio Unit Advanced Features
Under normal operation any scaling back of the data is temporary as it is in response to a transient degradation in the radio channel. The Four Wire Audio interface will prioritise enabled audio channels based on available bandwidth. The audio ports priority is sequential with port 1 having the highest priority and port 6 the lowest. -
Page 12: Bandwidth Requirements
ANDWIDTH EQUIREMENTS The following tables identify the bandwidth requirements of the Four Wire Audio interface. It is referenced to the selected mode, active audio channels and UART data rate. When audio channels are dynamic (E & M controlled) the required bandwidth will vary depending on the active channels at that time. -
Page 13: Radio Unit Bandwidth
A single static audio channel. Up to 65000 bps of Ethernet data. Two additional dynamic audio channels limiting Ethernet data to 33000 bps when one is active and 1000 bps when both are active. © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 14: Latency
6ms. For a complete list please refer to the ‘MiMOMax Radio Installation and Operation Guide’. Four Wire Audio interface unit Latency (As would be achieved by direct connection between two Four Wire Audio interface units). Audio latency < 6ms (end-to-end audio delay for active channel) E&M latency... -
Page 15: Power
POWER VERVIEW The Four Wire Audio interface contains an isolated pre-regulator followed by local regulators to individual functional blocks. The Isolated DC/DC Pre-Regulator accepts an input range of 12 to 48 volts DC and outputs a DC voltage with a nominal value of 10.5 volts DC. -
Page 16: Audio Interfaces
E&M signals (Note: Modems up to 4800 bps only are supported). There are six audio channels incorporated into the Four Wire Audio interface where each audio channel is coded into the G726 32kbps ADPCM format. Dynamic (E&M controlled) and static (always up, E&M independent) channel operation is supported. -
Page 17: E & M Signalling
The FWA unit internally senses a DC voltage across the E-Lead pins. A DC voltage between 10v and 50v will allow the audio presented to the associated audio port to pass to the other end. © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 18: Cabling And Connectivity
Signalling Output RJ45 Plug (std and shielded) RJ45 Socket Stacked RJ45 Socket RJ45 Pin Numbering The ports labeled 1 through 6 are audio ports. Image Showing Audio Cable Connected To Port 5. © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 19: Four Wire Audio Connectivity Examples
Connectivity at FWA B shows a valid E-Lead signal and therefore audio passes to FWA A and the M-Lead is energised. Applicable to configuration selections 0 (channels 1 through 6) and 3 (Supports 2 audio channels only, channels 5 and 6). © MiMOMax 2013 Four Wire Audio Interface Manual... - Page 20 Channel 3 shows E-Lead signal at FWA-B only allowing audio to pass from B to A only. Applicable to configuration selections 0 (channels 1 through 6) and 3 (Supports 2 audio channels only, channels 5 and 6). © MiMOMax 2013 Four Wire Audio Interface Manual...
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Page 21: Data Interfaces
NOT USED Recieve Data UART Data COM (EIA232) Port Transmit Data NOT USED Shield Four Wire Audio Unit Circuit Overview 5.1.2 Cabling and Connectivity © MiMOMax 2013 Four Wire Audio Interface Manual... - Page 22 NOTE (1): For early Four Wire Audio Units (Serial Numbers between 2690065 and 2690109) these lines are not connected. Although internally connected on later units their use is not currently supported. RJ45 – DB9 mapping Signal (FWA unit) Pin (RJ45) Pin (DB9) Tx Data Rx Data Signal GND © MiMOMax 2013 Four Wire Audio Interface Manual...
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Page 23: High Speed Serial Interconnect (Hssi)
These contain the Audio and/or COM port data streams. The frame rate is dependent on the air interface configuration. Recieve Clock Recieve Data FWA Data HSSI Port HSSI v2 Framer Transmit Clock Transmit Data Shield Four Wire Audio Unit Circuit Overview © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 24: Cabling And Connectivity
The recommended cable for the HSSI connection is shielded twisted pair similar to Belden 1868E fitted with a shielded RJ-45 plug. HSSI-A Connector (RJ45 socket) Provides direct connection to MiMOMax Radio Unit. Utilises a one-to-one connecting lead (shielded cable and plugs). Signal Description... -
Page 25: Hssi Cross Over
Rx Clock A Tx Clock A Rx Clock B Tx Clock B Rx Data A Tx Data A Rx Data B Tx Data B Shield / GND Body Body Shield / GND © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 26: Hssi Loop Back
HSSI Loop Back Connections Signal Pin (RJ45) Pin (RJ45) Signal Tx Clock A Rx Clock A Tx Clock B Rx Clock B Tx Data A Rx Data A Tx Data B Rx Data B © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 27: Installation
FWA box to the mounting bracket are visible in the opposite image. ADIO ONNECTIVITY Image Of Radio Unit And Four Wire Audio Interface Co-Located In The Rack Mount Tray, With Shielded Connecting Cable In Place. © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 28: Radio Unit Configuration
Radio Unit configuration is achieved through the CCMS web application. At this stage the FWA interface is unable to be configured from CCMS. For additional information regarding Radio Unit configuration please refer to the ‘MiMOMax Radio Installation and Operation Guide’. - Page 29 CCMS Screen Capture Showing FWA Interface Status Display. The CCMS Four Wire Audio status display is updated by selecting the ‘Refresh’ button. The status will NOT update automatically. © MiMOMax 2013 Four Wire Audio Interface Manual...
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Page 30: Firmware Upgrades
FIRMWARE UPGRADES Firmware upgrades may only be performed at a MiMOMax Wireless service centre. If you require a firmware upgrade please contact MiMOMax Wireless directly for the location of the nearest service centre. © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 31: Pre Firmware Version 3.00 Considerations
Power LED (orange) HSSI LED (green) COM LED (green) Four Wire Audio Interface Front IO Power LED (orange): On when power applied. Off when no power is applied or a power fail condition exists. HSSI LED (green): Nominally off, flashing on to indicate HSSI port activity (both transmit and receive). -
Page 32: Configuration
1. Only a single Fixed Channel is supported and the utilised port is different. 2. The order of enabled ports is different for 3 and 7 channel modes. 3. The ports utilised for 3 channel mode are different. © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 33: High Speed Serial Interface (Version 1)
Shield / GND Body Body Shield / GND NOTE (1): At the Radio Unit GND is isolated from chassis ground. Connection of the ground at each end is required to ensure correct operation. © MiMOMax 2013 Four Wire Audio Interface Manual... -
Page 34: Radio Unit Configuration
On the ‘Configure Serial Interfaces’ CCMS web page the mode needs to be set to HSSI. Serial Interfaces CCMS Web Page Showing HSSI Selection For further details on Radio Unit configuration please refer to the document ‘MiMOMax Radio Installation and Operation Guide’. -
Page 35: Technical Data
Data Rate 9600 (Set in Firmware and NOT user configurable) Latency <1ms Network (HSSI) Port Connector RJ45 Protocol Proprietary for direct connection to MiMOMax Radio Units Power Connector Detachable screw terminal Type Isolated DC/DC converter Isolation 1500 volts Nominal Input Voltage...
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