harris_intraplex products_video codec_issue1

DO NOT COPY - DO NOT DISTRIBUTE Last Modified: May 23, 2001 11:24 am


© Copyright 2001 Harris Corporation.All rights reserved.

Intraplex Video Codec System ManualIssue 1, November 2000

Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws.

WarrantyThe information contained in this document is subject to change without notice. Intraplex makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.

Harris shall not be liable for errors contained herein or for incidental or consequential damage in connection with the furnishing, performance, or use of this material.

Trademark CreditsIntraGuide� is a trademark of Intraplex, Inc. Other trademarks are the property of their respective owners.

How to Contact UsHarris CorporationIntraplex Transmission Solutions59 Porter RoadLittleton, Massachusetts 01460-1410USA

Phone: +1 978 486 9000

Fax: +1 978 486 0660

E-mail: [email protected]: http://www.intraplex.com

How to Get SupportIf you have a technical question or issue with your Intraplex equipment, please check our customer support on our web site.

You can also send e-mail to: [email protected]

Video Codec System
What is in this section?1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Power Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6 Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Harris CorporationIntraplex Transmission Solutions


Video Codec SystemOverview

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1 OverviewThe Video Codec System is a two module set (DS-64NC plus VCP-1SN or VCP-1SP) that allows transmission of standard video signals using an Intraplex Access Server or CrossConnect Server. The VCP-1SN/VCP-1SP accepts a standard NTSC/PAL video signal and compresses it for transmission. The DS-64NC multiplexes the resulting digital signal onto a T1 or E1 path and also provides for remote programming of the data rate. A matching set of modules at the receiver de-multiplexes and decompresses the video signal. The output of the receiver can be connected to a standard NTSC/PAL video monitor.

The Video Codec System occupies 3 card slots and can use from 1 to 24 timeslots in a T1 stream or 1 to 31 timeslots in an E1 stream. The resolution and quality of the video is set using switches on the VCP-1SN/VCP-1SP module. The bandwidth occupied by the system determines the frame rate and is set either through switches on the DS-64NC or remotely using IntraGuide configuration and management software or ISiCL commands from a computer terminal. The data rate can be changed by the user to match changing requirements.

2 ComponentsThe Video Codec System contains the following components:� VCP-1SN: This is a two-slot wide NTSC video Codec card. There is one

bank of switches on the board to select video settings. In addition there are two toggle switches. These settings are not remotely programmable. See Figure 3-1 on page 5 and Table 3-1 on page 6 for detailed descriptions of the VCP-1SN settings.

� VCP-1SP: This is a two-slot wide PAL video Codec card. There is one bank of switches on the board to select video settings. In addition there are two toggle switches. These settings are not remotely programmable. See Figure 3-1 on page 5 and Table 3-1 on page 6 for detailed descriptions of the VCP-1SP settings.

� MA-800: This two-slot wide module adapter plugs in opposite the VCP-1SN/VCP-1SP, providing three BNC connectors: one DB-9 connector and a two-position terminal block. However, only one BNC-the video input or video output-is active at this time. The DB-9 connector provides the RS-449 input connection to the DS-64NC. The terminal block is used for external power, if required. (See Figure 2-1 on page 5.)

� DS-64NC: The DS-64NC is used to transport the RS-449 data generated by the VCP-1SN/VCP-1SP over the T1 or E1. This module sets the speed of the video, and is remotely programmable. Details on the installation and operation of the DS-64NC are found in the DS-64NC Wideband Synchronous Data Module Manual.

� MA-412: This is the standard RS-449 module adapter for the DS-64NC. (See Figure 2-1 on page 5.)

� Video System Cable: A cable is supplied for inter-connection between the MA-800 and MA-412 (see). It is six inches long with a DB-9 on one end and a DB-37 on the other end. (See Figure 5-2 on page 7.)

Video Codec System Manual Harris CorporationIssue 1, November 2000 Intraplex Transmission Solutions


Video Codec SystemControls

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Figure 2-1 MA-412 and MA-800 module adapter ports

3 ControlsThe VCP-1SN/VCP-1SP controls must be set before applying power. Figure 3-1 below shows the location of switches 1, 2, and 3 on the VCP-1SN/VCP-1SP. The control settings are explained in Table 3-1 on page 6.

Figure 3-1 Top view of VCP-1SN/VCP-1SP, showing control switches



Video Codec SystemPower Requirement

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4 Power RequirementA total of 1.75 Amps must be available from the +5V source in the multiplexer chassis for each VCP-1SN/VCP-1SP. External +5V connections are available on the MA-800 for systems where the current draw exceeds the capability of the power supply.

5 InstallationThe DS-64NC provides the point to point communications circuit for the VCP-1SN/VCP-1SP module. The VCP-1SN/VCP-1SP will operate with any bandwidth from 64 Kbps to 2.048 Mbps. The setup of the DS-64NC is discussed in detail in the DS-64NC Wideband Synchronous Data Module Manual.

Note: The MA-412 module adapter must be set for an external clock (TT) for use with a VCP-1SN/VCP-1SP.

Figure 5-1 on page 7 shows how the VCP-1SN/VCP-1SP is integrated into a system with the MA-412 and MA-800 module adapters and the DS-64NC data module on the Intraplex multiplexer bus. Figure 5-2 on page 7 provides the cabling between the module adapters, and Figure 5-3 on page 8 illustrates a functional block diagram of a VCP-1SN/VCP-1SP video system.

Table 3-1 Control settings on the VCP-1SN/VCP-1SP

Switch Setting Function

SW1 EXT Configures module for external +5V power.

INT Configures module for internal power.

SW2 ENCODER Configures module as an encoder (signal compression).

DECODER Configures module as a decoder (signal decompression).

SW3 ENC/DEC Configures module as encoder or decoder. Must match the setting on SW2. DOWN = DECODER.

VIDEO SELECT 1 This switch must remain UP.

VIDEO SELECT 2 This switch must remain UP.

QUALITY 1 &QUALITY 2

For encoder use only. Settings affect only low-speed operations. This will affect image quality as follows:

Image Quality Quality 1 Switch Quality 2 Switch

BEST DOWN DOWNVERY GOOD UP DOWNGOOD DOWN UPFAIR UP UP

RESOLUTION For encoder use only. Settings affect only low-speed operations.DOWN = 176x144 resolution UP = 352x288 resolution



Video Codec SystemInstallation

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Figure 5-1 Installation of the VCP-1SN/VCP-1SP video Codec system cards

Figure 5-2 Cabling of the MA-412 and MA-800 module adapters



Video Codec SystemApplications

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Figure 5-3 System functional diagram

6 ApplicationsThe signals from several different cameras can be multiplexed onto on a single T1 or E1 link. Figure 6-1 on page 9 illustrates a multi-channel simulaneous transmission system.

The video signals from all cameras are transported on a single transmission line. In the example in Figure 6-1 on page 9, four video signals are transported on a T1 line using only half (768 Kbps) the bandwidth on a T1.

For this example, each of the video transmitter DS-64NC�s is set to transmit continuously using three time slots (192 Kbps). The control center displays the video on four separate monitors. A computer with IntraGuide Network Management and Configuration software is connected to a CM-5 and can control the video channels. To provide a detailed, high resolution video on a specific camera, IntraGuide can reduce the time slot usage of the other three cameras and increase the time slot usage of the remaining camera.




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Figure 6-1 Application of video codec system using simultaneous channels




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