Interface Description Peak MTT
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1 Y-SC Håkan Sandström Interface Description Peak MTT Author: Håkan Sandström Approved by: Joakim Andersson Distribution List: form [STL 6] Page 1 (13)
2 Contents 1 Introduction Change History Definitions References Overview Interfaces Fill Interface MIC Interface LTS Interface Data Interface Radio Interface Power Interface Battery Interface...13 Page 2 (13)
3 1 Introduction This document is the interface description for MTT, an encryption unit for tactical radio systems used in the MAEI system. The description covers the mechanical and electrical interfaces. For functional descriptions, see [1]. 1.1 Change History Rev. Changes Author Date 1.0 First issue. Specifications that may be subject to change are highlighted. 2.0 Added pin numbers Changed specification of fill power interface. Added specification of audio levels and limiting. Added specification of line interface levels Defined all TBD. 3.0 Changed specification of data interface with support for hook switch and additional material. Updated picture. HS HS HS Added connector type information HS Definitions AGC DCE DFD DTE LTS MAEI MTT Ra 180 Automatic Gain Control Data Communication Equipment Data Fill Device Unit used for key fill and configuration of MTT Data Terminal Equipment LokalTelefoniSystem Intercom system Maskinkrypto Armén Erik Internationellt (Crypto system) Mobilt Taktiskt Talkrypto Mobile encryption unit for tactical voice communication Tactical VHF radio system used by the Swedish Defense. 1.3 References [1] System Specification Peak, MTT, Sectra Y-SC [2] "Characteristics of 28 Volt DC electrical systems in military vehicles", MIL-STD-1275B Page 3 (13)
4 2 Overview Fill interface: Interface for key fill, configuration and software update. Connects to a DFD for key fill and configuration and to a PC for software update. 2. MIC interface: Plaintext audio interface for connection of standard radio handsets and other compatible devices, for example, intercom system LTS LTS interface: Plaintext audio interface for connection of intercom system LTS 80/90/100 and other compatible devices, for example, speaker amplifier. 4. Radio interface: Interface for network access. Connects to, for example, vehicular and manpack radios. 5. Data interface: Plaintext data interface for connection of Data Terminal Equipment (DTE). Alternatively used for connection of a hook switch. 6. Power interface: DC input compatible with 12 V and 28 V systems. 7. Battery interface: Interface for an installed battery. Page 4 (13)
5 3 Interfaces 3.1 Fill Interface The Fill interface is an interface for key fill, configuration and software update. It connects to a DFD for key fill and configuration and to a PC for software update. The interface comprises: Power interface: DC output for power supply of a connected fill device. Control interface: Serial interface for configuration and software update. The interface is a DCE interface that complies with V.24 for asynchronous communication. The following signals are provided: TD, RD and DTR. An inverted TD signal is also supported. The data rate is bps. Key interface: Dedicated serial interface for key fill. The interface is a DCE interface that complies with V.24 for asynchronous communication. The following signals are provided: TD, RD and DTR. The data rate is 9600 bps. Note that the DTR signal is common to both the Control interface and the Key interface Mechanical characteristics Lemo F Series, HEN.1F.308.CLNP PIN 1 8-contact female socket with N keying Push-pull connector Electrical characteristics Pin # I/O Signal Function 1 - GND Signal ground 2 Output Ctrl_RD Control interface, Receive Data: V.28 3 Input Ctrl_TD Control interface, Transmit Data: V.28 4 Output Key_RD Key interface, Receive Data: V.28 5 Input Key_TD_Inv Key interface, Transmit Data inverted: V.28 6 Input Key_TD Key interface, Transmit Data: V.28 7 Output Power DC power output 3.6 V, max 400 ma 8 Input DTR Data Terminal Ready: V.28 Page 5 (13)
6 3.2 MIC Interface The MIC interface is a plaintext audio interface for connection of standard radio handsets and other compatible devices, for example, intercom system LTS Mechanical characteristics MIL-C-55116, Amphenol P 6-contact receptacle Spring-loaded contacts Electrical characteristics Pin # I/O Signal Function A - GND Signal ground B Output Audio out Headphone output Hz, > 4.5 mw in 1 ko C Input PTT PTT input open circuit => receive short circuit to GND => transmit D Input Audio in Microphone input Hz, 2.8 mvrms nominal (ri = 150 O), input resistance 470O E - NC Not used F - NC Not used Audio out/audio in The output level and input sensitivity is controlled by the volume switch. Additionally an AGC function limits the audio signal at the input. That is, input levels above the limiting threshold are attenuated. Volume setting Input amp. Audio in, limiting threshold Audio out (db) (mvrms) (Vrms at 1 ko load) Page 6 (13)
7 3.3 LTS Interface LTS is a plaintext audio interface for connection of intercom system LTS 80/90/100 and other compatible devices, for example, speaker amplifier. The interface comprises: Power interface: DC output for power supply of external equipment, e.g. speaker amplifier. Audio interface: Supports 3 khz audio with PTT input. Output level and input sensitivity is fixed. Compatible with intercom systems LTS 80/90/ Mechanical characteristics MIL-C-55181, MW20F(M)D00 18-contact socket receptacle Electrical characteristics Pin # I/O Signal Description A - GND Signal ground B - NC Not used A B M L N C P D R E K J V U H T S F C Output Power DC power output (directly supplied from power input Radio/Power) 28 V, max 1 A D - NC Not used E - NC Not used F - NC Not used H - NC Not used J - NC Not used K Output Audio out Audio output Hz, 220 mvrms in 150 O L - NC Not used M - NC Not used N - NC Not used P - NC Not used R - NC Not used S Input PTT PTT input open circuit => receive short circuit to GND => transmit T - NC Not used U Input Audio in Audio input Hz, 220 mvrms (ri = 150 O), input impedance 470 O signal above a 90 mvrms threshold are limited at the input V - NC Not used Page 7 (13)
8 3.4 Data Interface The Data interface is a plaintext data interface for connection of data terminal equipment (DTE). The interface is a DCE interface that complies with V.24 for asynchronous serial communication. The following signals are provided: TD, RD, DTR, DSR, RTS, CTS and DCD. Data rates up to kbps are supported. Note that the maximum data rate also depends on the environment, e.g. cable length and the characteristics of the interface circuit of the connected equipment. Alternatively this interface can be used for connection of a hook switch Mechanical characteristics Lemo F Series, HEN.2F.319.CLNP PIN 1 19-contact female socket with N keying Push-pull connector Electrical characteristics Pin # I/O Signal Description 1 - GND Signal ground 2 Output DCD Data Carrier Detect: V.28 3 Output Hook out Hook switch output: V.28 always on (positive level) 4 Output CTS Clear To Send: V.28 5 Input TD Transmit Data: V.28 6 Input RTS Request To Send: V.28 7 Output DSR Data Set Ready: V.28 8 Input DTR/Hook in Data Terminal Ready or Hook switch input: V.28 On (positive level) => off-hook Off (negative level) or unconnected => on-hook 9 Output RD Receive Data: V NC Not used 11 - NC Not used 12 - NC Not used 13 - NC Not used 14 - NC Not used 15 - NC Not used 16 - NC Not used 17 - NC Not used 18 - NC Not used 19 - NC Not used Page 8 (13)
9 Hook Switch A hook switch is connected as shown in the following figure. Hook out Hook in Open => on-hook Closed => off-hook Figure 1. Hook switch connection Data Transmission The DTE sets RTS to initiate data transmission. The DCE responds by setting CTS when transmit setup is finished. The DTE then starts transmitting. The transmit setup delay varies and depends on the type of network. For Ra 180, the setup time is in the order of 1 second. In case transmit setup fails, CTS will not be set. The DTE sets RTS off at the end of transmission. The DCE discards all data received on the serial interface when RTS is off. The DCE implements flow control to handle the fact that the asynchronous data rate on the local serial interface is higher then the synchronous data rate on the line. The DTE must stop sending data when CTS is off. Data transmission can be resumed when CTS is set again. Note that RTS must be off to enable data reception. RTS CTS TD Figure 2. Data transmission Data Reception The DCE sets DCD when receiving data. Received data is output at a pace controlled by the synchronous data rate on the line. As the asynchronous data rate on the local serial interface is higher, received data will be interleaved with short idle periods. DCD is also set when traffic is received or transmitted via other interfaces, i.e. voice traffic. In this case, the received data signal is idle. Note that the DCD signal provides carrier sense that can be used with various link access methods. DCD RD Figure 3. Data reception Page 9 (13)
10 3.5 Radio Interface The Radio interface is a multi-function network interface that comprises: Audio interface: Supports 3 khz audio with PTT output and squelch input. Output level and input sensitivity is fixed by configuration. Can be configured for either portable or vehicular use. Line interface: Two-wire interface compatible with Ra 180/GS2. Supports audio (3 khz), low speed data (V.21, 300 bps) and high speed data (AMI, 16 kbps ± 10 ppm). Data interface: Serial interface for connection of DCE. The interface is a DTE interface that complies with V.24 for asynchronous and synchronous communication. The following signals are provided: TD, RD, DTR, DSR, RTS, CTS, DCD, RI, TCK and RCK. Data rates up to kbps asynchronous and 64 kbps synchronous are supported. Note that the maximum practical data rate depends on the cable length and the characteristics of the interface circuit of the connected equipment. Power interface: DC input compatible with MIL-STD-1275B for 28 V DC electrical systems in military vehicles. Note that supplied power is also available on the LTS/Power output for supply of connected equipment. The radio interface is configured with either the audio, line or data interface active Mechanical characteristics Lemo F Series, HES.2F.319.CLDP PIN 1 19-contact male socket with S keying Push-pull connector Electrical characteristics Pin # I/O Signal Description 1 Input Power DC input V, max V, max V additionally max 1 A for LTS/Power output 2 Input DSR Data Set Ready: V.28 3 Input CTS Clear To Send: V.28 4 Input RI Ring Indication: V.28 5 Input RCK Receive data Clock: V.28 6 Input TCK Transmit data Clock: V.28 7 Input RD Receive Data: V.28 8 Input Audio in Audio input, Hz Portable config: 1 Vrms, input impedance 1 ko Vehicular config: 220 mvrms, input impedance 150 O 9 Output Audio out Audio output: Hz Portable config: 2.8 mvrms (ri = 150 O) Vehicular config: 220 mvrms (ri = 150 O) 10 I/O Line A Two-wire line interface, Hz, 600 O, max 2 Vpp differential 11 I/O Line B See above Page 10 (13)
11 Pin # I/O Signal Description 12 - GND Signal ground 13 Input Squelch Squelch input open circuit or +5V => enable audio in short circuit to GND => disable audio in 14 Output RTS Request To Send: V Input DCD Data Carrier Detect: V Output TD Transmit Data: V AGND Analog ground 18 Output PTT PTT output open circuit => receive short circuit to GND => transmit 19 Output DTR Data Terminal Ready: V Line The following signaling is supported on the line interface Signal Modulation/Coding Output level (in 600 O) Input level Audio Base band Hz -16 dbm < -13 dbm Low speed data V.21, 300 bps -14 dbm -20 dbm to -13 dbm High speed data AMI, 16 kbps ± 10 ppm 1.2 Vpp 0.6 Vpp to 2 Vpp Page 11 (13)
12 3.6 Power Interface The Power interface is an external DC input compatible with both 12 V and 28 V systems. The interface complies with MIL-STD-1275B for 28 V DC electrical systems in military vehicles Mechanical characteristics Lemo F Series, HES.1F.303.CLDP PIN 1 3-contact male socket with S keying Push-pull connector Electrical characteristics Pin # I/O Signal Description 1 Input Power DC input V, max V, max V 2 - GND Ground 3 - NC Not used Page 12 (13)
13 3.7 Battery Interface The Battery interface is an interface for a Lithium Ion battery pack with nominal voltage 10.8 V Mechanical characteristics AMP contact battery header connector with left power key Key + C D T Electrical characteristics Pin # I/O Signal Description + Input Positive Power input, positive, nominal 10.8 V, max 0.5 A C - NC Not used D - NC Not used T - NC Not used - Input Negative Power input, negative, grounded Page 13 (13)
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