un poco de "como funcionan las cosas..."
un poco de rollo,pero interesante....
CONTENTS 1) How does the cable company control a Jerrold Descrambler? 2) What is the difference between a CFT22xx and the other models? 3) When is the "ESN" or serial number used? 4) Why did the T2,RFT series boxes fail on CFT22xx? 5) How can I fix my box once I used a T2,T2A,RFT tester on by rented descrambler? 6) What is multi-mode REALLY? 7) What is the solution to SERIAL NUMBERS THEN? SECTION-1. 1) How does the cable company control a Jerrold Descrambler? The cable company sends a series of commands to your Jerrold box through an FM frequency. (Generally 89.3,97.5,106.5,108.5,122.7Mhz). The command syntax is: (length 1byte) (command type 1 byte) (command 1 byte) (paramaters ... many bytes) (checksum .. 1 byte) Everyones cable box has a serial number on it. (Written on the bottom). It is 5 bytes in length and usually begins with 2. Inside your CFT/DPBB is a subscriber number. The subscriber number is from 0 to approx 225,000. Inside your box is also a site code which is used by the cable company to identify which *cable company* the box is to work in. Put very easily, Inside you have: A Serial Number --- On outside of box A Dynamic Subscriber Number --- a number programmed in you box by the cable company (no one knows it) A Site Code --- Every cable company has their own number SERIAL NUMBER: This number is only inside the box in case it gets *confused*. It is a static number which never changes. This means if you called the cable company and said you had a problem like "You converter is disconnected". then they would address your box using the serial number. There are very few commands which use the serial number and they only ever change data inside the box like: Dynamic Subscriber Number, Site Code, etc... DYNAMIC SUBSCRIBER NUMBER: This number is used for most (really all) standard operating commands. Commands that would use the DSN would be: Channel Map Changes Program Authorizations Two-Way communications Time, data. Shutdowns, and reset timer commands. SITE CODE: Is used in most commands to ensure the only boxes using those commands are the boxes programmed for that area. Ie: Lets say you took your Jerrold(tm) box from your state and brought it into another state using the same kind of technology. Chances are the subscriber number in your box could be the same as someones in the area you just hooked your box into. In order to stop that kind of movement Jerrold implimented a site code. If the site code coming down the line inside the commands don't match your box then your box will actually shut down (E8)... RFT-Plus,T2s caused this.. (but we will get to that later) Types of commands (and we will even get into some actual codes): RESET TIMER Syntax: Length =6 Type=249 DSN (dynamic subscriber number) (checksum) The reset timer command resets an internal timer in your Jerrold box. Why? Well, GI thought that if some subscriber got smart and blocked the FM data from getting through the cable company would no longer be able to address the box. Right? Wrong - GI made sure that if your box doesn't hear a reset timer (with its own unique DSN) then its time to shutdown. (Error 1). CHANNEL MAP UPDATE. This command controls what channels are where. This command requires a DSN. Each command can move 8 channels around. SHUTDOWN BOX Syntax: Length =6 Type=248 DSN (dynamic subscriber number) (checksum) This command is sent to ALL the DSNs the cable company currently does not use AND as well uses it on all subscribers which don't pay their bill, steal their box, etc... This command puts the famous "YOUR CONVERTER IS DISCONNECTED. PLEASE CONTACT YOUR CABLE OPERATOR" TURN ON CHANNELS (Global) Syntax: Length=4 Type=253 Command=127/129 ChannelId (1byte) (Checksum) This command turns channels on/off (premium/pay per view). It does not require a DSN and makes many boxes very happy :) SET DYNAMIC SUBSCRIBER NUMBER Syntax: Length=16 Type=253 Command=95 (serial# 5 bytes) (ID - usually 224 191 127 62) (Site code (4bytes)) (Checksum) This command is issued by the Cable company when there is a problem addressing your box. It resets your DSN and Site code to the numbers passed. (The RFT/T2 units use this command on CFT22xx units,,, and boy o boy does it cause hell in your set top!) There are many other commands ... The above should give you the idea. SECTION-2 2) What is the difference between a CFT22xx and the other models? The CFT22xx model units were put out because GI was fed up with simple cubes turning on all the channels in their boxes. They took out ALL global commands in the CFT22xx units. (That means you must address the unit by its DSN ONLY!). This caused serious problems for the cubes out there - the only way to make one work is to actually CHANGE the subscriber information in the box. This will work for a little while but the cable company knows the box has been tampered with. (In fact, the only way to get your old DSN back in is to call the cable company and ASK them to reboot your unit for some silly reason. (Cable companies aren't doing that too often anymore).) Any CUBE/T2/RFT/TESTER that requires you to enter a serial number WILL DEFINATELY CHANGE YOUR DSN. In fact, Old T2s and RFT-Plus, RFT-Gold even change your site code. You know what that means now --- shut off the tester and your set-top is "Out of the AREA"-Error 8 - "YOUR CONVERTER IS DISCONNECTED"... SECTION-3 3) When is the "ESN" or serial number used? The ESN - Serial number is ONLY EVER used to CHANGE subscriber numbers and SITE CODES. THE SERIAL NUMBER DOES NOT TEST CHANNELS. SECTION-4 4) Why did the T2,RFT series boxes fail on CFT22xx? When you plug in a T2/RFT (or ANY other requiring you to enter the SERIAL number on your box (Either by an F2 or barcode)) and enter the serial number, the cube WILL change important addressing information used by the cable company to address/talk to your box. If your in a two way system you have REAL problems... If your box doesn't respond to their commands they have only two possibilities to investigate: 1) An unplugged box (don't worry , they will try day after day for a month) 2) Your box information has been changed by a cube. How can they tell? Easy --- If your using an old T2/RFT they just have to see the error number in your box (E8 - Invalid Site Code) or if its the *new* line of "Uncorruptable T2 testers" then all they have to do it SHUTDOWN the DSN the T2 puts out for ALL devices. When you call for help- your busted! EASY AGAIN: T2s and RFTs do NOT transmit ONLY towards your cable box. They transmit down to the pole OUTSIDE your house. (try it... In/Out ... it makes no difference which way you hook them up). If your box is not responding they can very quickly disconnect your cable and listen for YOUR CUBE... Bad news when they record the data coming out of your LIVING ROOM! SECTION-5 5) How can I fix my box once I used a T2,T2A,RFT tester on by rented descrambler? If your lucky you can call the cable company for a re-boot. If you have two-way they WILL show up at your door. If you call the cable company too often for REBOOTs they will investigate. They can HEAR your cube on your cable line outside your house if they feel there is a problem - AUTOBUST (They do not EVEN have too call you if they feel there is a problem - just check it out). SECTION-6 6) What is multi-mode REALLY? Multimode is a command sent out by the cable company (global command) which tells your box that the scrambling system is about to change. If your box doesn't hear the command it will descramble the wrong way. This generally makes the picture unviewable. This command can be sent very often. Cubes like the T2/RFT stop sending information every 6 seconds and allow 5 seconds of data to pass through (hoping a multi-mode command gets through). SECTION-7 7) What is the solution to SERIAL NUMBERS/CFT 22xx THEN? Buy a tester which supports ALL Jerrold(tm) products without having to enter a serial number. There are other addressing schemes used which will allow you to address your box(CFT22xx) WITHOUT entering a serial number. Cubes like the T2,RFT,RFT-PLUS,T2-A,RFT-???,Testbench 2200 all require the entry of a serial number. As a consumer, find dealers who sell cubes for CFT22xx/multimode which DONT require a serial number to be entered. saludos, |
muchas gracias compañero ,pero te comento algo si fueses tan amable de ponerlo en castellano ,pues muchos user lo entenderian algo mejor
un saludo |
bueno, ya todos sabemos los principios basicos de un deco y chipearlo.
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perdon si sobraba el post...me habia parecido interesante mas que nada por las anotaciones de como la operadora puede "rastrear" artefactos,y como direcciona y maneja los jerrold en este caso...
perdon de nuevo, saludos. |
no te preocupes, lo que importa es intentar ayudar.
saludos. :) |
MVISION BLOQUEADO
Hola a tod@s, igual mi caso ya ha salido en algún post pero no lo he econtrado.
Tengo un mvision s4 y se me acaba de quedar colgado al intentar ver france2 o france4 con el hotbird:enfadado:. No sé cómo solucionarlo porque no encuentro ni siquiera la forma de resetear: ¿alguien puede ayudarme? Gracias. |
La franja horaria es GMT +2. Ahora son las 17:29. |
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