Black Box VSPX-HDMI-CSRX
Contents
1. Chapter 2 Overview Table 2 3 Continued Cascadable receiver s components Number Component 16 level rotary control switch RJ 45 signal input 3 5 mm connector HDMI output connector RJ 45 signal output Interlocking power jack Description Adjust the 16 level equalization control corresponding to the transmission distance of receiving HDMI signals For surround sound audio output adjust from O to 7 longest to shortest transmission length For stereo audio output adjust from 8 to F longest to shortest transmission length We recommend adjusting from 7 to O or trom F to 8 to find the optimal visual result Adjust the signal level from 7 to 0 or F to 8 and stop turning the rotary switch when the audio video is playing normally Inappropriate signal level setting may cause an over power condition that could damage the converter Interconnect input Audio out plug in a local speaker here Connect to a local HDMI display with an HDMI male male cable here or link to another cascadable receiver for cascading Interconnect output Connects to 5 VDC 4A power supply unit 724 746 5500 blackbox com Page 17 Chapter 2 Overview Table 2 3 Continued Cascadable receiver s components Number Component Description 9 Link LED Lights when a link is present 10 Link LED Lights when a link is present 11 Power LED Lights when power to the port is on 12 Power LED Lights when power to t2. El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo descrito en las instrucciones de operaci n Todo otro servicio deber ser referido a personal de servicio calificado 9 El aparato el ctrico debe ser situado de tal manera que su posici n no interfiera su uso La colocaci n del aparato el ctrico sobre una cama sof alfombra o superficie similar puede bloquea la ventilaci n no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilaci n 10 El equipo el ctrico deber ser situado fuera del alcance de fuentes de calor como radiadores registros de calor estufas u otros aparatos incluyendo amplificadores que producen calor 11 El aparato el ctrico deber ser connectado a una fuente de poder s lo del tipo descrito en el instructivo de operaci n o como se indique en el aparato 12 Precauci n debe ser tomada de tal manera que la tierra fisica y la polarizaci n del equipo no sea eliminada 13 Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos poniendo particular atenci n a los contactos y recept culos donde salen del aparat
3. Type A 19 pin female Output 1 HDMI 1 RJ 45 with 2 LED indicators 1 Power 1 Link 1 3 5 mm audio earphone jack for stereo audio 2 channel PCM only 724 746 5500 blackbox com Page 7 Chapter 1 Specifications Indicators VSPX HDMI1X4 TX 2 LEDs 1 RED Power 1 GREEN Signal VSPX HDMI RX 2 RJ 45 LEDs Power VSPX HDMI CSRX 6 LEDs 1 RED Power 1 GREEN HDMI DVI 2 RJ 45 Signal in status 2 RJ 45 Signal out power Temperature Tolerance Operating 32 to 104 F 0 to 40 C Storage 4 to 140 F 20 to 60 C Relative Humidity 20 to 90 noncondensing Power VSPX HDMI1X4 TX 5 VDC 4 A 13 watts maximum VSPX HDMI RX 5 VDC 4 A 1 watt maximum VSPX HDMI CSRX 5 VDC 4 A 7 5 watts Size VSPX HDMITXA TX 1 1 H x 4 3 W x 7 6 D 2 7 x 11 x 19 4 cm VSPX HDMI RX 1 1 H x 3 5 W x 6 8 D 2 7 x 9 x 17 5 cm VSPX HDMI CSRX 1 H x 4 2 W x 7 D 2 6 x 10 7 x 17 9 cm Weight VSPX HDMI1X4 TX 1 3 Ib 0 6 kg VSPX HDMI RX 0 4 lb 0 2 kg VSPX HDMI CSRX 1 2 Ib 0 5 kg Page 8 724 746 5500 blackbox com Chapter 2 Overview 2 Overview 2 1 Introduction The VSPX HDMI1X4 TX transmitter works with the VSPX HDMI RX or VSPX HDMI CSRX receiver to extend high definition video and high quality audio to different locations over a long distance The transmitters are cascadable enabling you to increase the number of total displays The input HDMI source can be
4. VSPX HDMI1X4 TX Built in VSPX HDMI CSRX 8 level digital output signal equalization ESD Protection 1 human body model 19 kV air gap discharge and 12 kV contact discharge 2 core chipset 8 kV HDCP Compliance Yes HDMI Compliance HDMI deep color and 3D Housing Metal enclosure Input DDC Signal 5 Volts peak to peak TTL Input TMDS Signal VSPX HDMI1X4 TX 1 1 Volts peak to peak VSPX HDMI RX VSPX HDMI CSRX 1 2 Volts peak to peak Mounting Wallmounting ears with screws PCB Stack up 4 layer board impedance control differential 100 ohms single 50 ohms Role VSPX HDMI1X4 TX Transmitter VSPX HDMI RX Receiver VSPX HDMI CSRX Cascadable receiver Transmission Over UTP 24 bit color VSPX HDMI1X4 TX VSPX HDMI CSRX Full HD 1080p 130 ft 40 m over CATx cable HD 720p 1080i 200 ft 60 m over CATx cable Video Bandwidth Single link 225 MHz 6 75 Gbps Video Support 480i 480p 720p 1080i 1080p up to 36 bit color User Controls VSPX HDMI1X4 TX 4 DIP switches for EDID control VSPX HDMI RX 1 8 level digital HDMI signal equalization rotary control switch VSPX HDMI CSRX 16 level HDMI signal equalization and audio rotary control Connectors VSPX HDMI1X4 TX Input 1 HDMI Output 4 RJ 45 1 HDMI VSPX HDMI RX Input 1 RJ 45 with 2 LED indicators 1 Power 1 Link Output 1 HDMI Type A 19 pin female VSPX HDMI CSRX Input 1 HDMI
5. DMI over CATx cable e Perfectly integrated with other compatible HDMI over CATx series products 724 746 5500 blackbox com Page 9 Chapter 2 Overview 2 2 2 Additional Features for VSPX HDMI1X4 TX e Regenerates the HDMI signal e HDMI local output for monitoring e Supports default HDMI EDID and can learn the EDID of displays e Extends up to 66 feet 20 m of input HDMI cable e Outputs video up to 200 feet 60 m over CATx cable using HD 720p 1080p e Outputs video up to 130 feet 40 m over CATx cable using Full HD 1080p e Wallmountable NOTE The cable length depends on the characteristics and quality of the cables Higher resolutions and longer transmission distances require low skew cables 25 ns 100 m for best performance We recommend using solid core CAT6 cable 2 2 3 Additional Features for VSPX HDMI RX e Extends up to 200 feet 60 m over CATx cable using HD 720p 1080i e Extends up to 130 feet 40 m over CATx cable using Full HD 1080p e Wallmountable NOTE The cable length depends on the characteristics and quality of the cables Higher resolutions and longer transmission distances require low skew cables 25 ns 100 m for best performance We recommend using solid core CAT6 cable 2 2 4 Additional Features for VSPX HDMI CSRX e Regenerates and outputs the HDMI signal e Support for stereo audio analog or 7 1ch audio via HDMI interface e Extends up to 200 feet 60 m 720p 10801 over CATx c
6. VSPX HDMI1X4 TX VSPX HDMI CSRX lt gt BLACK BOX VSPX HDMI RX NETWORK SERVICES Customer Support Information Order toll free in the U S Call 877 877 BBOX outside U S call 724 746 5500 e FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 e Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com e E mail info blackbox com Trademarks Used in this Manual Trademarks Used in this Manual Black Box and the Double Diamond logo are registered trademarks and COMPEL and MediaCento are trademarks of BB Technologies Inc Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners Page 2 724 746 5500 blackbox com FCC and IC RFI Statements NOM Statement FEDERAL COMMUNICATIONS COMMISSION AND INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates uses and can radiate radio frequency energy and if not installed and used properly that is in strict accordance with the manufacturer s instructions may cause interference to radio communication It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart B of Part 15 of FCC rules which are designed to provide reasonable protection against such interference when the equipment is operated in a commercial environment Operation of t
7. able e Extends up to 130 feet 40 m 1080p over CATx cable e Up to three layers of cascaded units can be used to reach a total distance of up to 393 feet 120 m e Wallmountable NOTE The cable length depends on the characteristics and quality of the cables Higher resolutions and longer transmission distances require low skew cables 25 ns 100 m for best performance We recommend using solid core CAT6 cable Page 10 724 746 5500 blackbox com Chapter 2 Overview 2 3 What s Included Your package should include the following items If anything is missing or damaged contact Black Box Technical Support at 724 746 5500 or infoO blackbox com 2 3 1 VSPX HDMI1X4 TX e 1 1X4 Transmitter VSPX HDMI1X4 TX e 1 5 VDC international 4 A in line power supply unit with US power cord e 2 mounting screws e This user s manual 2 3 2 VSPX HDMI RX e 1 Receiver VSPX HDMI RX e 1 5 VDC international 4 A in line power supply unit with US power cord e 2 mounting screws e This user s manual 2 3 3 VSPX HDMI CSRX e 1 Cascadable Receiver VSPX HDMI CSRX e 1 5 VDC international 4 A in line power supply unit with US power cord e 2 mounting screws e This user s manual 2 4 Hardware Description 2 4 1 1 x 4 Transmitter VSPX HDMI1X4 TX Figures 2 1 2 2 and 2 3 show the front back and top panels of the transmitter Table 2 1 describes its components 1 ER NAL POW o SIG OO Figu
8. d to transport or ship your transmitter receiver or cascadable receiver e Package it carefully We recommend that you use the original container e f you are returning the unit make sure you include everything you received with it Before you ship for return or repair contact Black Box to get a Return Authorization RA number 724 746 5500 blackbox com Page 27 Black Box Tech Support FREE Live 24 7 Tech support the way it should be Great tech support is just 30 seconds away at 724 746 5500 or blackbox com BLACK BOX About Black Box Black Box provides an extensive range of networking and infrastructure products You ll find everything from cabinets and racks and power and surge protection products to media converters and Ethernet switches all supported by free live 24 7 Tech support available in 30 seconds or less O Copyright 2013 Black Box Corporation All rights reserved VSPX HDMI1X4 TX version 2 724 746 5500 blackbox com
9. duplicated and distributed to up to four HDMI enabled displays linked by CAT5 5e 6 cables with HDMI over CAT5 receivers VSPX HDMI If you only need a single port transmitter buy the compatible 3D HDMI extender kit VX HDMI TP 3D40M The VSPX HDMI1X4 TX also has a local HDMI output for monitoring With built in equalization the input HDMI cable can be extended up to 66 feet 20 meters using Full HD making the overall transmission distance better when compared to generic HDMI splitters The VSPX HDMI CSRX receiver works with the VSPX HDMI1X4 transmitter VSPX HDMI RX receiver or VX HDMI TP 3D40M extender kit to distribute HDMI DVI video sources to up to ten displays in a daisychained connection via CAT5 5e By using the VSPX HDMI1X4 TX transmitter and making four separate chains the number of displays can be increased to a total of 40 The cascade ability allows pure digital video and audio broadcast station by station and extends HDMI compliant video and audio anywhere The VSPX HDMI RX receiver works with the transmitter or VSPX HDMI CSRX cascadable receiver to extend high definition video and high quality audio over a distance via CAT5 5e 6 cable The receiver works with an HDMI transmitter or splitter over single CAT5 and enables you to extend HDMI compliant displays almost anywhere 2 2 Features 2 2 1 VSPX HDMI1X4 TX VSPX HDMI RX VSPX HDMI CSRX e Support HDMI deep color and 3D e HDCP compliant e Transmits uncompressed digital H
10. he port is on 2 5 Application Diagrams Figures 2 8 through 2 10 show typical application diagrams for the transmitter receiver and cascadable receiver VSPX HDMI1X4 TX VSPX HDMI RX XQ HDMI source Local HDMI HDMI output monitor monitor Figure 2 8 Connection diagram 1 Page 18 724 746 5500 blackbox com Chapter 2 Overview VSPX HDMI1X4 TX m VSPX HDMI CSRX HDMI output wea monitor HDMI output monitor COMPEL Figure 2 9 Connection diagram 2 724 746 5500 blackbox com Page 19 Chapter 2 Overview HDMI monitor a VSPX HDMI CSRX iCOMPEL pw Wil CATx cable CATx cable r4 64 ft 40 m 64 ft 40 m a VSPX HDMI1X4 TX Local HDMI output monitor 3 m m gy CATx cable 128 ft 40 m VSPX HDMI RX TA HDMI monitor VSPX HDMI RX VSPX HDMI RX MA HDMI monitor HDMI monitor A Figure 2 10 Connection diagram 3 Page 20 724 746 5500 blackbox com Chapter 3 Configuration 3 Configuration 3 1 Switch Settings on the Transmitter Figure 3 1 shows the VSPX HDMI1X4 TX transmitter board s switch locations Table 3 1 describes the switches settings lt gt BLACK BOX www blackbo B WRN MediaCento HX BLACK BOX MEDIA DISTRIBUTION 1X4 Transmitter Figure 3 1 Switches on the transmitter board Table 3 1 Trans
11. his equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio Interference Regulation of Industry Canada Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de classe A prescrites dans le R glement sur le brouillage radio lectrique publi par Industrie Canada Normas Oficiales Mexicanas NOM Electrical Safety Statement INSTRUCCIONES DE SEGURIDAD 1 Todas las instrucciones de seguridad y operaci n deber n ser le das antes de que el aparato el ctrico sea operado 2 Las instrucciones de seguridad y operaci n deber n ser guardadas para referencia futura 3 Todas las advertencias en el aparato el ctrico y en sus instrucciones de operaci n deben ser respetadas 4 Todas las instrucciones de operaci n y uso deben ser seguidas 724 746 5500 blackbox com Page 3 NOM Statement 5 El aparato el ctrico no deber ser usado cerca del agua por ejemplo cerca de la tina de ba o lavabo s tano mojado o cerca de una alberca etc 6
12. ings set DIP switch to EDID learning to copy the EDID from the local monitor Section 3 2 Plug in the 5 VDC 4 A power supplies Power on the HDMI displays Power on the HDMI source device 10 If you see a flickering or blinking image on the remote displays adjust the rotary control switch on the receivers to adjust the video signal strength see Table 2 2 or 2 3 11 If you are installing several VSPX HDMI CSRX units in a cascade setup always start by adjusting signal strength on the unit nearest the transmitter and move on to the adjacent units VSPX HDMI1X4 TX VSPX HDMI RX lt _ lt eee HDMI source Local HDMI HDMI output monitor monitor Figure 4 1 Connection diagram 724 746 5500 blackbox com Page 23 Chapter 5 Pin Definitions 5 Pin Definitions 5 1 HDMI Pin 19 17 15 13 11 9 7 5 3 18 16 14 12 10 8 6 4 2 1 Figure 5 1 HDMI female connector Table 5 1 HDMI connector pinout Signal TMDS Data2 TMDS Data2 Shield TMDS Data2 TMDS Data1 TMDS Data 1 Shield TMDS Datal TMDS Data0 TMDS DataO Shield TMDS DataO TMDS Clock Pin 17 18 19 Signal TMDS Clock Shield TMDS Clock GEC Reserved not connected SCL SDA DC CEC Ground 5 V Power Hot Plug Detect Page 24 724 746 5500 blackbox com 5 2 RJ 45 CATX Pin dl Figure 5 2 RJ 45 connector Chapter 5 Pin Definitions i Table 5 2 RJ 45 CATx TIA EIA 568B connect
13. mitter board s switch settings Left DIP switch Position Right Position Number Name Setting Setting 1 Video mode 2D display 3D display 2 Audio mode 2 ch Ji aa 3 HD mode 720p 1080p 4 EDID mode EDID learn Default EDID NOTE Instant switching is enabled only when the video and audio setting of the source has been adjusted to Auto or Passthrough 724 746 5500 blackbox com Page 21 Chapter 3 Configuration 3 2 EDID Learning 1 Power on the transmitter Connect the display that you want to learn the EDID to the HDMI output connector 2 To learn the display s EDID for the source device connected to the HDMI output on the transmitter set EDID mode to the left position Power on the transmitter and wait for about five seconds to complete the EDID learning process Page 22 724 746 5500 blackbox com Chapter 4 Installation 4 Installation To broadcast HDMI signals to four remote displays with a local port follow these instructions 1 2 Turn off all devices including sources and displays Connect an HDMI source such as a Blu ray disc player to the HDMI port on the transmitter Connect the receivers via CAT5 5e 6 cables to each HDMI signal output port 4 Connect the local HDMI equipped monitor UI 7 8 9 Set EDID DIP switch settings of the transmitter according to your displays Chapter 3 If the monitor s resolution or refresh rate differs from the extender s built in EDID sett
14. nt Interlocking power jack Power LED RJ 45 connector Power LED 8 position switch HDMI output connector Description Connects to 5 VDC power supply unit Lights when power is on Interconnect Lights when power is on Adjust the 8 level equalization control to the received HDMI male male cable The HDMI signal level varies from O strongest to 7 weakest for respective transmission length from longest possible range to short distance Adjust the signal level from 7 to 0 and stop turning the rotary switch when the audio video is playing normally Inappropriate signal level setting may cause an over power condition that could damage the converter Connect to an HDMI display with an HDMI male male cable 724 746 5500 blackbox com Page 15 Chapter 2 Overview 2 4 3 Cascadable Receiver VSPX HDMI CSRX Figures 2 6 and 2 7 show the front and back panels of the cascadable receiver Table 2 3 describes its components 1 Figure 2 6 Cascadable receiver s front panel 9 10 11 12 ES SURROUND Ii Audio OUT HDMI OUT HDMI Signal OUT Ti ill HDMI Signal IN Signal Level 2 3 4 5 6 7 8 Figure 2 7 Cascadable receiver s back panel Table 2 3 Cascadable receiver s components Number Component Description 1 Power LED Lights when power to the unit is on ON when HDMI signal is detected 2 HDMI DVI LED l OFF when DVI signal is detected Page 16 724 746 5500 blackbox com
15. o 14 El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deber ser localizada lejos de las lineas de energia 16 El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo Page 4 724 746 5500 blackbox com NOM Statement Safety Notice 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilaci n 18 Servicio por personal calificado deber ser provisto cuando A El cable de poder o el contacto ha sido da ado u B Objectos han ca do o l quido ha sido derramado dentro del aparato o C El aparato ha sido expuesto a la lluvia o D El aparato parece no operar normalmente o muestra un cambio en su desempe o o E El aparato ha sido tirado o su cubierta ha sido da ada Safety Notice Please read and follow the safety instructions to protect yourself from possible injury and to minimize the risk of damage to the units e Follow all instructions and warnings maked on the units e Do not attempt to service the units yourself except where explained in this manual e Provide proper ventilation and air circulation and do not use near water e Keep objects that might damage the device away and make sure the placement of the units are on stable surfaces e Use only the power adapter power cords and connec
16. or pinout T568A Pair T568A Color 3 White Green 3 Green 2 White Orange 1 Blue 1 White Blue D Orange 4 White Brown 4 Brown T568B Pair 2 2 T568B Color White Orange Orange White Green Blue White Blue Green White Brown Brown 724 746 5500 blackbox com Page 25 Chapter 6 Performance Guide 6 Performance Guide for HDMI Over Category 5 6 Cable Transmission Table 6 1 Cable performance guide Performance Rating Type of CAT5 6 Cable Wiring Shielding CAT5 CAT5e CAT6 Unshielded UTP Xe dox Solid Shielded STP WU kk xk kk Unshielded UTP Stranded Shielded STP Termination Use EIA TIA 568 B termination Page 26 724 746 5500 blackbox com Chapter 7 Troubleshooting 7 Troubleshooting 7 1 Contacting Black Box If you determine that your transmitter receiver or cascadable receiver is malfunctioning do not attempt to alter or repair the unit It contains no user serviceable parts Contact Black Box Technical Support at 724 746 5500 or info blackbox com Before you do make a record of the history of the problem We will be able to provide more efficient and accurate assistance if you have a complete description including e the nature and duration of the problem e when the problem occurs e the components involved in the problem e any particular application that when used appears to create the problem or make it worse 7 2 Shipping and Packaging If you nee
17. re 2 1 Transmitter s front panel 724 746 5500 blackbox com Page 11 Chapter 2 Overview Figure 2 2 Transmitter s back panel lt gt BLACK BOX www blackbox com MediaCento HX BLACK BOX MEDIA DISTRIBUTION 1X4 Transmitter Figure 2 3 Transmitter s top panel Page 12 724 746 5500 blackbox com Chapter 2 Overview Table 2 1 Transmitter s components Number Component Description ON when power to the unit is on 1 Power LED OFF when power is off ON when HDMI source signal is 2 Signal LED detected OFF when no HDMI signal is detected 5 VDC power Connects to 5 VDC 4 A interlocking 3 connector power adapter HDMI input 4 Connects to HDMI source connector HDMI output 5 Links to HDMI output for local monitor connector 6 CS CATx output 1 4 connectors 7 SW1 2D 3D mode 8 SW2 Audio mode 9 SW3 HD mode 10 SWA Learn EDID mode 724 746 5500 blackbox com Page 13 Chapter 2 Overview 2 4 2 Receiver VSPX HDMI RX Figures 2 4 and 2 5 show the front and back panels of the receiver Table 2 2 describes its components HDMI Signal IN Figure 2 4 Receiver s front panel 5 6 lin 07 HDMI OUT Signal Level Figure 2 5 Receiver s back panel Page 14 724 746 5500 blackbox com Number Chapter 2 Overview Table 2 2 Receiver s components Compone
18. tion cables designed for the units e Do not use liquid or aerosol cleaners to clean this unit Always unplug the power to the device before cleaning 724 746 5500 blackbox com Page 5 Table of Contents Table of Contents DAMES 0 uo RUE 7 P3 c MEC eee 9 ZI UIDI eus ea 9 LE MEE A cl fas e O o EROR 9 2 2 1 VSPX HDMI1X4 TX VSPX HDMI RX VSPX HDMI CSRX 9 2 2 2 Additional Features for VSPX HDMIIX4 TX 10 2 2 3 Additional Features for VSPX HDMI RX 10 2 2 4 Additional Features for VSPX HDMI CSRX sessen 10 23 Whats WWE A o Gw Ng IR 11 234 SPADA a 11 222 WVSPX HDNMIER Curl oli 11 2 3 32 VSPX HDMI CSRX ed AR OO 11 2 4 Hardware Description siria 11 2 4 1 1X4 Transmitter VSPX HDMI1X4 TX iiu 11 2 4 2 Receiver VSPX HDMI RX rr LII I FFF Leo 14 2 4 3 Cascadable Receiver VSPX HDMI CSRYX iiien 16 25 Application Dina 18 E LE A A 21 3 1 Switch Settings on the Transmitter 21 CP ARI PEN DNE EO TT 22 LES uc NEA a DTE 23 ZB Re ERROR 24 CX A RE FFWR RR FN 24 52 B A HE 25 Performance Guide for HDMI Over Category 5 6 Cable Transmission 26 Troubleshooting o HNN YY FRYN NN UU FFON 27 71 Contacting Black BOX uu GG tut Gta Sata du bu RA FAEN dda 27 7 2 Shipping and Para ten AS 27 Page 6 724 746 5500 blackbox com Chapter 1 Specifications 1 Specifications Audio Support Surround sound up to 7 1ch or stereo digital audio Equalization
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