NEC Mcu 5000a Multipoint Control Unit Equipment Manual
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NECA 340-414-100 Revision 2.0Page 59 MCU 5000A Multipoint Control Unit General Description Manual Figure 6-3: MCU 5000A Unit Installation Layout L I F # 1L I F # 2L I F # 3L I F # 4E C H 2 2 1 M U X # 1E C H 2 2 1 M U X # 2E C H 2 2 1 M U X # 3E C H 2 2 1 M U X # 4E C H 2 2 1 M U X # 5E C H 2 2 1 M U X # 6E C H 2 2 1 M U X # 7E C H 2 2 1 M U X # 8V S W / L S DH S D I F # 1H S D I F # 2A C O D E C # 1A C O D E C # 2A S U MP G / S I OM C O N TPWR CABLE SPACE 01 23 45 6 7 8 024 6810121416182022 24 2628 (U) 1U = 1.75 (4.45 cm) (B) 1B = 0.59
Page 60NECA 340-414-100 Revision 2.0 General Description Manual MCU 5000A Multipoint Control Unit Table 6-1: MCU 5000A Electrical Specification UNIT ITEM DESCRIPTION Connected Terminal and LineTe r m i n a lTeleconference: VisuaLink AD series CODEC: VisuaLink 5000 Accommodating Transmission rate Same line rate terminal. Line RateAMI (B8ZS)64/2x64/128/192/256/384/2x384/512/768/1152/ 1472/1536 kbps. RS-42256/56×2/64/64×2/128/192/256/384/2x384/512/ 768/1152/1536/1920 kbps. ISDN (H0) 64/2x64/384/2x384 kbps. Teleconference controlAudio Signal Control Option Selectionµ -Law PCM (ITU-TS G.711 3.4 kHz) SB-ADPCM (ITU-TS G.722 7 kHz) Visual Switching Control OptionAutomatic SwitchingPerforms the comparison of audio level of each teleconference terminal, and the identification of talker. (Talker’s terminal displays the image of primary talker.) Teleconference Transmitting Control (option)Broadcasts the video signal of the required teleconference terminal to all of the remote terminal. Operator Control (option)Operator terminal, which has been preliminarily get, determined and switches the broadcasting video signal. Receiving Select Control (option)Each teleconference terminal determines and receives the individual terminal image. Line Exchange ControlPoint-to-Point Sets the terminals on point-to-point in bidirectional. One WayThe terminals are connected in unidirectional. Broadcasting to the plural terminal specified is available. One Way MonitorSends the video signal of a terminal to the plural terminals specified. The sending terminal monitors the video image of the specified terminal in video receive mode. Multipoint Multipoint teleconference is provided. Tele-education Tele-education system is established. OtherLoopback Test Local/Remote Independent Loopback Control. Test Tone Generation/Output of System test tone. Video Switching TimeAverage time from teleconference request to requested video signal output: about 3 seconds (VisuaLink 5000 and line rate 384 kbps case.) ConditionInput Voltage AC 117V, DC -48V Power Consumption approx. 150 VA. Environment Condition Temperature: 32° to 104° F (0 to 40° C) Humidity: 45 to 85% Dimension19 in (W) × 15.7 in (D) × 14 in (H) 48.26 cm (W) x 39.88 cm (D) x 35.56 cm (H) Weight approx. 77.16 pounds (28.78 kilograms)
NECA 340-414-100 Revision 2.0Page 61 MCU 5000A Multipoint Control Unit General Description Manual 7: SYSTEM CONTROL AND VARIOUS APPLICATIONS A: Line Switching Control7.01 The outline of line switching control which is carried out within MCU 5000A inside is explained in the following paragraphs. Data Highway 7.02 The block diagram of basic signal flow for video and audio signals is shown in Fig. 7-1. The transmission rate of incoming line data is converted into the rate of internal data highway (2Mbps) in LIF unit and the data is transmitted to each unit. The internal data highway is composed of LB bus applied to point-to- point connection, LD bus (S and R) applied to multipoint connection, MD bus (S and R), and LSD (S and R). Figure 7-1: Block Diagram of Basic Signal Flow (1) (2) (3) (4) (5) (6) LIF CH1 LINE 1 LINE 2 LINE 8LIF CH2 LIF CH8EC H221 MUX CH1 EC H221 MUX CH2 EC H221 MUX CH8A CODEC CH1 A CODEC CH2 A CODEC CH8A SUM V SW/ LSD Note: (1) LB bus (0 - 7) (4) LSD (S, R) (2) LD bus R (0 - 7) (5) MD bus R (0 - 7) (3) LD bus S (0 - 7) (6) MD bus S (0 - 7)
Page 62NECA 340-414-100 Revision 2.0 General Description Manual MCU 5000A Multipoint Control Unit Multipoint Connection 7.03 Multipoint teleconference is controlled with the Conference Management (CM) and multipoint Teleconference Control (TC) tasks. The conference is controlled with two Teleconference Control (TCA/TCB) tasks individually, therefore multipoint teleconferences of two groups can be held at the same time. 7.04 When Conference Management (CM) task receives request message for multipoint connection from Console Control (CC) task, it activates the relating tasks to lines (LM, LC, LX) first, and makes multipoint line connection with the specified line rate. After that, it transfers the request message for multipoint connection to multipoint Teleconference Control (TCA/TCB) task and transfers the control to the task. Multipoint Teleconference Control (TCA/TCB) task transfers the received request message for multipoint connection to Picture Switch (PS) task and Voice Control (VC) task. At the same time Picture Switch (PS) task and Voice Control (VC) task is controlled to broadcast the picture and voice of the terminal which receives the information message of CODEC alignment recovery from BAS Driver (BD) task. 7.05 When these tasks, multipoint teleconference control task determines the transmission rate and voice coding mode to exchange the capacity with CODEC via BAS Driver (BD) task. Teleconference operating status is transferred to the teleconference terminals when receiving the request message for connecting to the teleconference terminal from LAP-B driver. The following controls of multipoint teleconference with four terminals (example) are provided. Voice Signal 7.06 Among the line data of four terminals, the voice signal is received on A CODEC unit via LIF unit and EC H221 MUX unit. A CODEC unit decodes the coded voice signal and sends it to A SUM unit. A SUM unit sums voice signal received from each terminal, and sends it back to each terminal. At that time, the mixed voice signal (summed up voice signal of the terminals from the second to the fourth) except the voice signal of the originating terminal (the first terminal) is sent back to the originating terminal. 7.07 Namely, each terminal receives the sum-processed voice signal of all terminals by MCU 5000A except its own voice signal. The voice signal level except that of picture broadcasting terminal is limited to lower level than that of broadcasting terminal. The signal flow of voice signals are as shown in Fig. 7-2.
NECA 340-414-100 Revision 2.0Page 63 MCU 5000A Multipoint Control Unit General Description Manual Figure 7-2: Signal Flow of Voice Signals Picture Signal 7.08 Among the line data of 4 terminals, the picture signal is received on V SW/LSD IF unit via LIF unit and EC H221 MUX unit. V SW/LSD IF unit distributes the coded video signal of the broadcasting terminal to the other terminals by the control of CPU. The signal flow of video signals are as shown in Fig. 7-3. Figure 7-3: Signal Flow of Picture Signals LIF CH1EC H221 MUX CH1A CODEC CH1 LIF CH2 LIF CH3 LIF CH4 EC H221 MUX CH2 EC H221 MUX CH3 EC H221 MUX CH4 A CODEC CH2 A CODEC CH3 A CODEC CH4 A SUM CH 1 TRANSMIT SIGNAL CH 1 RECEIVE SIGNAL (PICTURE OF CH 2, 3, 4) CH 2 TRANSMIT SIGNAL CH 2 RECEIVE SIGNAL (PICTURE OF CH 1, 3, 4) CH 1 TRANSMIT SIGNAL CH 3 RECEIVE SIGNAL (PICTURE OF CH 1, 2, 4) CH 4 TRANSMIT SIGNAL CH 4 RECEIVE SIGNAL (PICTURE OF CH 1, 2, 4) LB LDR LDS LSD MDR MDS LINE 1 LINE 2 LINE 3 LINE 4 LIF CH1EC H221 MUX CH1 LIF CH2 LIF CH3 LIF CH4 EC H221 MUX CH2 EC H221 MUX CH3 EC H221 MUX CH4 V SW/LSD CH 1 TRANSMIT SIGNAL CH 1 RECEIVE SIGNAL (PICTURE OF CH 2) CH 2 TRANSMIT SIGNAL CH 2 RECEIVE SIGNAL (PICTURE OF CH 1)CH 1 TRANSMIT SIGNAL CH 3 RECEIVE SIGNAL (PICTURE OF CH 1) CH 4 TRANSMIT SIGNAL CH 4 RECEIVE SIGNAL (PICTURE OF CH 1) LB LDR LDS LSD MDR MDS LINE 1 LINE 2 LINE 3 LINE 4
Page 64NECA 340-414-100 Revision 2.0 General Description Manual MCU 5000A Multipoint Control Unit Low-speed Data 7.09 The control data for the multipoint teleconference is transmitted/received to/from the terminals through the LSD bus, the EC H221 MUX unit, and the LIF unit under control of the CPU. The electrical whiteboard data received from the LDS bus is distributed again to the LSD buses. Fig. 7-4 shows an example of the distribution of the electrical whiteboard data is received by the CPU and then transmitted from the CPU. Figure 7-4: Low-speed Data Flow LIF CH1EC H221 MUX CH1 LIF CH2 LIF CH3 LIF CH4 EC H221 MUX CH2 EC H221 MUX CH3 EC H221 MUX CH4 V SW/LSD CH 1 TRANSMIT SIGNAL CH 1 RECEIVE SIGNAL CH 2 TRANSMIT SIGNAL CH 2 RECEIVE SIGNAL (DATA OF CH 1)CH 1 TRANSMIT SIGNAL CH 3 RECEIVE SIGNAL (DATA OF CH 1) CH 4 TRANSMIT SIGNAL CH 4 RECEIVE SIGNAL (DATA OF CH 1) LB LDR LDS LSD MDR MDS LINE 1 LINE 2 LINE 3 LINE 4 M CONT
NECA 340-414-100 Revision 2.0Page 65 MCU 5000A Multipoint Control Unit General Description Manual Point-to-Point Connection 7.10 Different from multipoint connection, point-to-point connection sets up face-to-face video-teleconference. This connection is controlled with Conference Management (CM) task. When Conference Management (CM) task receives request-to-connect from Console Control (CC) task, it activates the relating tasks to lines (LM, LC, LX) and exchanges lines with the specified bit rate. In this case, the two conference terminals are connected with both ways. 7.11 When two points are connected, LIF unit outputs line data to the specified channel of LB bus with CPU control. Line data is output to the line from LIF unit of the specified channel through LB bus. Both two points receive the picture and the voice each other. Fig 7-5 shows examples of point-to-point connections of two groups. Figure 7-5: Data Flow on Point-to-Point Connection LIF CH1EC H221 MUX CH1 LIF CH2 LIF CH3 LIF CH4 EC H221 MUX CH2 EC H221 MUX CH3 EC H221 MUX CH4 V SW/LSD CH 1 TRANSMIT SIGNAL CH 1 RECEIVE SIGNAL (DATA OF CH 2) CH 2 TRANSMIT SIGNAL CH 2 RECEIVE SIGNAL (DATA OF CH 1)CH 1 TRANSMIT SIGNAL CH 3 RECEIVE SIGNAL (DATA OF CH 4) CH 4 TRANSMIT SIGNAL CH 4 RECEIVE SIGNAL (DATA OF CH 3) LB LDR LDS LSD MDR MDS LINE 1 LINE 2 LINE 3 LINE 4
Page 66NECA 340-414-100 Revision 2.0 General Description Manual MCU 5000A Multipoint Control Unit Broadcast Connection 7.12 Different from Multipoint connection, Broadcast connection provides a video teleconference which is similar to television transmission, namely a broadcasting TV station. In this case, the line data of the specified terminal is transmitted and distributed to all the other terminals through LB bus. Fig 7-6 shows an example of broadcast connection, point 3 as broadcasting terminal. Figure 7-6: Data Flow on Broadcast Connection LIF CH1EC H221 MUX CH1 LIF CH2 LIF CH3 LIF CH4 EC H221 MUX CH2 EC H221 MUX CH3 EC H221 MUX CH4 V SW/LSD CH 1 TRANSMIT SIGNAL CH 1 RECEIVE SIGNAL (DATA OF CH 3) CH 2 TRANSMIT SIGNAL CH 2 RECEIVE SIGNAL (DATA OF CH 3)CH 1 TRANSMIT SIGNAL CH 3 RECEIVE SIGNAL (DATA OF CH 4) CH 4 TRANSMIT SIGNAL CH 4 RECEIVE SIGNAL (DATA OF CH 3) LB LDR LDS LSD MDR MDS LINE 1 LINE 2 LINE 3 LINE 4
NECA 340-414-100 Revision 2.0Page 67 MCU 5000A Multipoint Control Unit General Description Manual B: Picture Switching Control 7.13 Switching Control of Picture display includes two modes, one is automatic switching and the other is manual switching. Automatic Switching Mode 7.14 The role of this mode is to recognize a terminal as a talker when voice level of the terminal exceeds a definite value, and to broadcast the picture of the terminal to each conference room automatically. 7.15 When the Voice Control (VC) task recognizes a talker by the interruption caused by A SUM unit, talker detection message is transferred to a multipoint Teleconference Control (TCA/TCB) task. 7.16 When the multipoint Teleconference Control (TCA/TCB) task receives the talker detection message, it sends necessary message to each related task in order to broadcast the picture of the conference room where a talker is detected to all the participating conference rooms. 7.17 First, in order to still the picture on screen momentarily, the teleconference control task sends a picture freeze command from EC H221 MUX unit to picture codec of the terminals via BAS Driver (BD) task, and then Picture Switch (PS) task switches picture broadcasting terminal with controlling V SW/ LSD unit. Successively, Picture Switch (PS) task sends picture refresh command to the broadcasting terminal via BD task. Voice control task mixes the voice signals of all the participant terminals, however the voice signal of broadcasting terminal is the highest level. Manual Switching Mode 7.18 The role of this mode is to switch a picture on screen with the command sent from a MCU console of each conference room. Picture switching request message from the terminals of each conference room is transferred to multipoint teleconference control task through V SW/LSD unit and via LAP-B Driver (LD) task. 7.19 When a picture switching command is entered from a console, it is converted to picture switching request message with console control (CC) task and moreover it is transferred to multipoint Teleconference Control (TCA/TCB) task via Conference Management (CM) task. 7.20 According to those messages, multipoint Teleconference Control (TCA/ TCB) task controls picture switching similar to automatic switching mode, so as to broadcast the picture of the specified conference room.
Page 68NECA 340-414-100 Revision 2.0 General Description Manual MCU 5000A Multipoint Control Unit C: Voice Detection Control7.21 Voice Detection Control is carried out with the occurrence of interrupting Voice Control (VC) task when a talker is detected on A CODEC unit. This control is available to broadcast the picture of a primary talker on the above mentioned automatic switching mode.