Implementing 1+1 RF Redundancy with the SMD-989
Contents
1. Relay 1 Bay 1 Port 3 MPEGAP Bitrate Error J WI Error Relay 1 H Apply Cancel Fig 3 1 SMD 989 System Condition and Relay Configuration For a full list of conditions available to trigger failover consult the SMD 989 user s manual Page 7 10 G sencore Revision 1 0 Implementing 1 1 RF Redundancy with the SMD 989 2011 Sencore Inc Application Note 4 Example System Configuration An example wiring diagram of two SMD 989 modulators in conjunction with a Quintech RFS2150 redundancy switch is shown below in Fig 4 1 SMD 989 Primary 6 z i E O EB q Modulated Output L Band SMD 989 Backup 4 9 O 0l0o 0o BB E3 O Y IF OUT us ner Modulated Output L Band 50 750 50 750 Connect Relay 1 Common Pin 2 on SMD Matching Pad Matching Pad to GND Pin on RFS 2150 Connect Relay 1 Normally Open Pin 3 on SMD to CTL Pin on RFS 2150 RFS 2150 E we dt PRIMARY SECONDARY m as aS g INPUT INPUT L Band Out To Transmitter Fig 4 1 Example Installation with Redundancy Switch When the Primary SMD 989 experiences a power failure input alarm or other pre configured condition see Section 3 the normally open relay will close This will connect the CTL and GND pins on the Quintech redundancy switch and automatically trigger a switchover to the backup input Additionally when one of the modulators loses power the RFS 2150 will detect loss of signal on its input port and automatically fail2. code can be obtained by contacting Sencore Inc About Sencore Sencore is an engineering leader in the development of high quality signal transmission solutions for the broadcast cable satellite IPTV and telecommunications markets The company s world class portfolio includes video delivery products system monitoring and analysis solutions and test and measurement equipment all designed to support system interoperability and backed by best in class customer support Sencore products meet the rapidly changing needs of modern media by ensuring the efficient delivery of high quality video from the source to the home More information about Sencore is available at the company s website www sencore com All trademarks and registered trademarks mentioned herein are the property of their respective owners Page 2 10 sencore Revision 1 0 Implementing 1 1 RF Redundancy with the SMD 989 2011 Sencore Inc Application Note Table of Contents E queo Peuegm E E E E eens ee es tg eet EA E rege tee apart EA EE E etinseaemeeeqanes 4 2 Redundancy System Configuration ccccesccccsssceccesseeceaseeccsaeeceaueeeceaseeessaseeseaueeeseageessaaseessageesesaseeesaasesssageessees 5 2 1 Redundancy System OVOTVIGW uucccses seek renta ru ondes ook hentic sob pana perdus x ula ek rcudkrsdisskpnstientus Taara rrian End 5 2 2 Specific Considerations when Configuring an RF Redundancy System cessere 5 3 mcer TICO OI PRESE mrt T S PUTO WE
3. over Note that the SMD 989 s contact closure ports are driven by Form C relays and can be connected in either the normally open or normally closed position The pinout of the SMD 989 alarm connector is shown in Fig 4 2 below Pin 1 Relay 1 Normal Closed Pin 2 Relay 1 Pin 3 Relay 1 O Common Normal Open Pin 6 Relay 2 Normal Closed O o Pin 4 Relay 2 Pin 5 Relay 2 O Common Normal Open KL Fig 4 2 SMD 989 DB 9 Alarm Connector Pinout Page 8 10 sencore Revision 1 0 Implementing 1 1 RF Redundancy with the SMD 989 2011 Sencore Inc Application Note 5 Qualified Equipment List The following redundancy switches have been evaluated in house by Sencore and are qualified for use with the SMD 989 Table 5 1 Qualified Redundancy Switches ETL Systems 23116 S5S5 RFS2150 Yes 17210 Yes Sencore is actively testing the SMD 989 with additional components so this list should grow over time If there is a specific redundancy you would like Sencore to test please contact us directly Sencore currently does not resell these solutions However Sencore can assist with contacting one of these companies and configuring the redundancy switch if desired Please contact your account manager at 605 339 0100 for more information Page 9 10 Sencore Revision 1 0 Page 10 10 G sencore Copyright 2011 Sencore Inc Sencore Inc 3200 Sencore Drive Sioux Falls S
4. 6 sencore Implementing 1 1 RF Redundancy with the SMD 989 Application Note December 2011 Page 1 10 www sencore com 1 605 978 4600 Revision 1 0 Implementing 1 1 RF Redundancy with the SMD 989 2011 Sencore Inc Application Note Copyright 2011 Sencore Inc All rights reserved 3200 Sencore Drive Sioux Falls SD USA www sencore com This publication contains confidential proprietary and trade secret information No part of this document may be copied photocopied reproduced translated or reduced to any machine readable or electronic format without prior written permission from Sencore Information in this document is subject to change without notice and Sencore Inc assumes no responsibility or liability for any errors or inaccuracies Sencore Sencore Inc and the Sencore logo are trademarks or registered trademarks in the United States and other countries All other products or services mentioned in this document are identified by the trademarks service marks or product names as designated by the companies who market those products Inquiries should be made directly to those companies This document may also have links to third party web pages that are beyond the control of Sencore The presence of such links does not imply that Sencore endorses or recommends the content on those pages Sencore acknowledges the use of third party open source software and licenses in some Sencore products This freely available source
5. D 57107 USA WWW Sencore com 1 605 978 4600
6. I ORI OW CN OSS EET E EODD T 3 2 Failover on Input Status or Unit EIFOES sssini nanni a a aa Demos ves E PUEE rn Example System COMTI UNA UO sssrinin a eee EE a i Ea EE e Eanna EA a eaan n E 8 Qualified Eqg ipment LISE No 9 Page 3 10 sencore Revision 1 0 Implementing 1 1 RF Redundancy with the SMD 989 2011 Sencore Inc Application Note 1 Introduction Satellite modulators sit at a critical point in the delivery chain for a video distributor When a satellite link goes down thousands or even millions of customers can lose their video feed Telephones from the provider s customer service center all the way up to the network operations center will begin ringing and a mad scramble to diagnose and repair the issue will kick off in no time While Sencore designs its modulators to operate reliably consistently and free of issues for years many distributors prefer to build an extra layer of reliability into their broadcast systems through the use of redundant equipment This application note outlines an example of a redundant system installation using the Sencore SMD 989 modulator The particular redundancy scenario illustrated in this document operates at the RF L Band layer of the distribution system and involves two redundant identically configured SMD 989 modulators As such it is referred to as 1 1 RF Redundancy Sencore does not currently manufacture RF redundancy switches Sencore s focus thus far has been on p
7. lover on Input Status or Unit Errors The SMD 989 provides internal monitoring of several key signal characteristics and unit status items Each of these can be selected as trigger conditions to activate the SMD 989 s relay output If this output is connected to the redundancy switch s control input these conditions can be used to trigger failover to the backup chain Fig 3 1 shows an example of the SMD 989 s system condition configuration dialog 4 Configure Report Information Lg Conditions Events Location Name Alarm Log Log Severity SNMP Trap Relay Relay Unit 10MHz Ext Ref Clock Error Error Relay 1 Unit 12 Supply Error v V Error Relay 1 Unit 3 3 Supply Error J v Error Relay 1 Unit 5 Supply Error v J Error Relay 1 Bay 1 Port 1 ASI Bitrate Error Vv V Error Relay 1 Bay 1 Port 2 ASI Bitrate Error v WI Error Relay 1 Bay 1 Port 3 ASI Bitrate Error v W Error Relay 1 Bay 1 Port 4 ASI Bitrate Error 4 WI Error Relay 1 Bay 1 Port 1 ASI TS Sync Error y WI Error Relay 1 Bay 1 Port 2 ASI TS Sync Error v v Error Relay 1 Bay 1 Port 3 ASI TS Sync Error J WI Error Relay 1 Bay 1 Port 4 ASI TS Sync Error v v Error Relay 1 Unit Fan Error v v Error Relay 1 Bay 1 IF Output Mute Error i W Error Relay 1 Bay 1 Input Bit Rate Exceeded 4 v Error Relay 1 Bay 1 Port 1 MPEGAP Bitrate Error W V Error F P Relay 1 Bay 1 Port 2 MPEGAP Bitrate Error v Iv Error
8. nput disappears An overview of this behavior can be found in the Failover Triggers section Relay Output The diagram above illustrates an optional relay output connection between the modulators and the redundancy switch This connection can be used to control switch failover More information on this topic can be found in the Failover Triggers section Redundancy Switch Output The L band output from the redundancy switch is the key critical link in the redundancy system As such it should be situated as close to the transmitter as practical It may be advantageous to site the entire modulation redundancy system in the transmitter facility As every installation is different additional specific considerations may apply in a given use case Sencore Application Engineers are happy to discuss additional details and can be reached at 605 339 0100 Page 6 10 sencore Revision 1 0 Implementing 1 1 RF Redundancy with the SMD 989 2011 Sencore Inc Application Note 3 Failover Triggers 3 1 Failover on Power Loss All of the redundancy switches recommended in this document support failover on loss of signal If a cable becomes disconnected an upstream portion of the system loses power or a power supply fails this will be sufficient to detect input loss and trigger failover to the backup modulation chain Some distributors may prefer to have a more comprehensive set of system conditions trigger redundancy switching 3 2 Fai
9. roviding modulators with the best possible signal quality most useful feature set for video distributors and quickest most straightforward set up and operation Sencore has however qualified several third party RF redundancy switches for use with our DVB S S2 modulator Redundancy switch design may seem outwardly simple but the switch s positioning as a single point of failure in the broadcast chain requires that it be designed with a high degree of reliability and robustness in mind The switches discussed in this system embody these qualities and have been qualified as compatible with the SMD 989 In addition they provide the proper interfaces for maximum system redundancy when coupled with the SMD 989 Page 4 10 sencore Revision 1 0 Implementing 1 1 RF Redundancy with the SMD 989 2011 Sencore Inc Application Note 2 Redundancy System Configuration 2 1 Redundancy System Overview A basic overview of a 1 1 RF redundancy system is shown in Fig 2 1 below It focuses on three pieces two modulators and a redundancy switch Many redundant broadcast systems have additional redundancy built all the way up the chain to the video encoder However as the focus of this paper is on redundancy in satellite modulation those pieces are not shown in the figure Transport Stream Input ASI or IP SMD 989 ms DVB S S2 Modulator Primary L Band RF Signal _ Third Party RF L Band RF Signal Redundancy Swi
10. tch Transport Stream Input ASI or IP SMD 989 N DVB S S2 Modulator Backup Fig 2 1 Diagram of 1 1 RF Redundancy System with Two Modulators and Redundancy Switch 2 2 Specific Considerations when Configuring an RF Redundancy System There are several important considerations to note when configuring and selecting components for a system such as this one Modulator Input The input feeds to the two modulators should be identical In the case of ASI video inputs the two inputs are typically fed from identical links of a fully redundant system or generated by a distribution amplifier or signal router In the case of MPEG TS over IP the two modulators should be subscribed to identical multicasts and may possibly be fed by separate network segments Modulator Configuration In order for the failover experience between the two units to be as seamless as possible the two modulators should be identically configured with regard to modulation parameters One exception to truly identical modulator configuration may be the IP addresses for the units Ethernet interfaces If the units are connected to the same network these IP addresses will be different Unit Profiles The Sencore Unit Profile Feature can be used to achieve identical unit configuration Profiles are human readable text files which can be downloaded from an SMD and contain all settings for the unit The profile can be applied to the backup unit to ensure identical mod
11. ulator setup Also if a unit should need to be physically replaced the profile can be applied to that replacement unit Note Sencore profiles exclude unit IP addresses by default and can be applied safely to two units on the same network Redundancy Switch Connection The redundancy switches suggested in this document have support for the full range of L Band signals However some switches support only a limited frequency band so it is important to check the supported frequency range when considering a switch Additionally there are a few other important items to note with regard to the modulator output 1 Most redundancy switches do not support pass through of BUC DC LNB power If power on the L Band output is required it may be necessary to inject that power after the redundancy switch 2 The same consideration applies to other signals which may be coupled onto the L Band cable such as a 10MHz reference clock Page 5 10 sencore Revision 1 0 Implementing 1 1 RF Redundancy with the SMD 989 2011 Sencore Inc Application Note 3 As always when connecting RF transmission components the L Band cable should be impedance matched This may require a matching pad between the modulator and the switch The SMD 989 s L Band output is a 50 Ohm SMA connector L Band Failover The redundancy switches in this document will monitor the L band input from the modulator and trigger a failover to the backup input signal if that i
Download Pdf Manuals
Related Search