Tag Archives: dvb-c

Inside a Pace Di4000

Earlier I went though the ntl CR3 Bromley software which was introduced in 2002 and was the basis for ntls new interactive services.

The Pace Di4000 was a redesign of the previous 4001 and 1000/2000 series box. Its worth mentioning that Pace’s model numbers don’t seem to follow a specific scheme, you would assume the Di4001 was the successor to the Di4000, however the Di4001 was the launch box for ntl in Langely areas and was a DAVIC based box, with the Di1000/DiTV1000 being its DOCSIS equivalent for Telewest and ntl Bromley areas.

These early generation boxes were designed around the Hitachi SH3 CPU with C-Cube Chipset for MPEG2 decoding and descrambling. The Di4000 replaces that with the Broadcom demodulator and the Conexant MPEG2 decoder which contains the ARM CPU.

Pace Di4000

Left Pace Di4001, Right Pace 2500 Sky Digibox

The main difference you will notice between the two is the reduction of components, with the Di4000 only having two main processors. The previous generation was split over 5 different processors. this reduction means the mainboard is smaller and the box produces less head as a result. In fact its not too far off an average Sky Digibox.

  • The Power supply is now separated from the main board, like the Sky Digibox design, allowing for the PSU to be replaced independently from the main board.
  • The audio out jacks have been removed, no you can no longer connect the box to a Hi-Fi system unless you use a scart breakout adaptor. The design for it still exists on the main board however.
  • The Serial port and Printer part are removed in favor of a single USB port. the serial port still exists and can be access using a VCR to RS232 adapter.
  • The second card slot has been removed, this was originally designed for Mondex cashcards.
  • The remote control protocol now supports IRDA and RC5

Conexant cx22490

Conexant CX22490 – ARM920 based core, 160Mhz – 175MIPS

Broadcom BCM3250KPB – Demodulator

CrystalLAN CS8900A-CQ – Ethernet controller

Conexant Bt861KRF – Video encoder for Scart/AV output

The tuner modules, one for TV and the other for data/DOCSIS modem

Pace Di4000 front panel board
Pace Di4000 rear panel
  • Power Input
  • Ethernet – For internet connectivity for the internal cable modem
  • USB port – To connect additional devices, never used officially by ntl or Telewest
  • IR in/Out – never used by ntl or Telewest
  • Scart ports
  • RF Input/Output
  • Cable Input

Diag Screens

To access these on this box, hold down the Up & Down buttons whilst the STB is booting, and continue to hold them down until you see this screen. The front panel LED display will change to ldr and will then go blank once you have entered diag mode.

ntl EPG 1
Di4000 Setup screen 1

Sets the default frequency which is checked when the stb boots up, this frequency carries the netid for the area and any software updates

Pace Di4000
Di4000 Setup screen 2

Shows build information about the software loaded, and the hardware identifier of the box.

Pace Di4000
Di4000 Setup screen 3

Cable modem IP address information

Pace Di4000
Di4000 Setup screen 4
Pace Di4000
Di4000 Setup screen 5

RF output configuration

Pace Di4000
Di4000 Setup screen 6

Shows recent PPV purchases

Pace Di4000
Di4000 Setup screen 7
Di4000 Setup screen 8

Shows contents of the flash memory

Pace Di4000
Di4000 Setup screen 9
Pace Di4000
Di4000 Setup screen 10
Pace Di4000
Pace Di4000
Di4000 Setup screen 12

Signal information

Pace Di4000

With cable feed connected

Pace Di4000
Pace Di4000
Pace Di4000
Pace Di4000
Pace Di4000
Pace Di4000
Pace Di4000 ntl loader

Ntl Bromley CR3

The replacement to CR2 software that saw the launch of interactive services for the bromley platform, CR3 saw a rewrite of the guide software, with everything now being written in the Liberate browser, and Two Way TV support for downloadable applications, whilst Liberate being used for interactive. This software would form the basis for Langely CR3, and would be the next step in unifying the platforms in terms of feature set.

Sadly not all areas had access to CR3 with former Videotron areas in London being stuck on pre-interactive CR1 blue to the networks inability to support a return path connection. ntl would have to upgrade and repull the network in order to provide support for broadband and on demand services, all of which are dependent on a return path.

The software here is running on a Pace Di4000N

ntl home screen

The user interface of ntl digital, not a fan of their purple/pink colour scheme and the bad thing is that its everywhere, thankfully they changed the scheme by the time it can to Langely.

Interesting is the listing for interactive settings, rather than be part of the list it looks like a separate link,

Now & next

Unfortunately the purple makes it’s way onto normal viewing, with the now and next bar

I’m not sure why these early cable TV software did not allow for the volume to be changed via the STB remote, since the Telewest side also did not support changing the volume. One theory was that customer would complain to ntl about how they were unable to her any sound through their TV, unaware that the volume on the analogue box has been set to a low level or mute, so to prevent further calls that disabled the feature.

In the end they enabled the volume control in a later build ofCR3, along with Telewest. Maybe they got fed up of the support calls asking why the volume control isn’t working on their box. In hindsight they should have followed the Sky design where the STB remote controls the volume on the TV at launch (they ended up doing this later, with the newer remotes)

The options button gives a small menu, allowing for access to the help function and a shortcut to the diary. The audio Language lets to changed the language of the audio, or enabled narrative audio description, Sky would later implement a similar feature in its Sky Guide.

TV Guide

ntl tv guide

The main TV guide grid. No channels here since the box is not connected to the cable feed.

Here would have been a list of all channel genres, such as Movies, Sports, News, etc

Pressing the i button shows a short description of the program

TV Guide: Diary

The diary is ntl’s version of the personal planner, and is used to store reminders for future events and shows. Future PPV events appear here.

Subject Search

The subject search feature can be thought of as an alternative to the A-Z listings of Sky Guide, showing programs rather than the channels themselves. The idea is that the customer can find a program they like by the genre of the show.

Sadly the TV guide only has 3 days of TV listings, compared to the 7 days offered by Sky Digital.

A list of subgenres

Searching for a specific program via text

The on screen keyboard, not sure if this is the way it’s supposed to look since a lot of the text to the right being cropped off.

ntl customers could also purchase an optional keyboard to make it easier to enter text.

ntl subject search

One nice feature is the ability to save personalized genre lists, here you choose the type of programs to like to see and you can easily search for that list without having to manually select categories.

Interactive

ntl interactive

Trying to load interactive services which sadly no longer exist. the Liberate middleware was used to deploy the interactive microsites, with the TwoWayTV middleware being used for the interactive applications such as games.

On Demand

Looking for PPV events, this was before true video on demand had launched

ntl on demand

Settings

ntl parental control

The parental control feature

Changing TV settings, not sure what Enhanced Programming corresponds to?

Favourites

The favorites feature, very similar to Ntl Langely CR3

Help

ntl help cr3

There’s a help system but with no content stored on the box.

Diag Screen

Diag screen that shows the software an signal information

ntl error

Using with Virgin Media

Somehow I was able to get the box to bootup on a modern Virgin media connection, with many Channel and TV listings being loaded. Sadly I was not able to get any TV channels to load, not even radio channels which still broadcast in MPEG2

Pace Di4001 Adventures – Part 2

A look at ntl’s CR3 software for the Langely Platform

CR3 was ntl’s long awaited upgrade for their Langely customers who had previously no access to any interactive services, unlike the Bromley division that had full interactivity for some time. Part of this was due to the different return path technology used, ntl had originally went with DAVIC compared to Telewest and Cable & Wireless who deployed the DOCSIS standard for their TV return path. Although they are similar in terms of functionality, the differences meant ntl could not adapt the Cable & Wireless software for the Langely platform. In addition, Langely areas also ran different software with the original EPG being provided by Pace with the Liberate 1.2 browser being installed. CR3 would see a rewrite of the entire guide with everything now being done in Liberate, this meant that the Liberate browser was loaded on start-up, unlike earlier versions where the user had to wait for the browser to load.

CR3 saw a drastic change in the user interface, with the new ntl colour scheme being adopted

Screenshots below shows the stb without nay channels loaded, I have to force boot the stb by holding they down key until Boot came up on the front panel display. Sadly I was unable to get the box to load with the cable feed.

Now & Next

ntl now next
ntl CR3 mini guide
With alternative colour scheme enabled

TV Guide

ntl CR3 main menu

The main user interface layout, you can see the Sky Guide influence with its layout

Viewing all channels, this would be populated with all subscribed channels, unfortunately the STB does not pick up any channels, either it cant load the NIT or the tuner inside the box is knackered

Viewing channels based on genre, up to 7 channels can be displayed at any time

Diary function, this is like the Personal Planner on Sky Guide, you can schedule future programmes to be entered here. Unable to test further since the box can’t load any programmes

On Demand

Ntl revamped replace its PPV service with a full on demand service, the programmes ordered could be watched easily. This software seems to be from before on demand was implemented as despite the menu saying ‘On Demand’ the box shows PPV options instead.

Interactive

Not functional 😦

Settings

Rearrange Channels

ntl had the ability for the customer to rearrange the channels in their EPG, allowing for channels to have their own number. This feature was removed when they migrated over to the Telewest based UK1 software

ntl CR3 change channel numbers

I can soft of understand why the feature was cut, in a family household one could easily rearrange the channel numbers which would cause issues with other members trying to figure out the channel numbers, and probably resulted in increased support calls from customers trying to figure out what had happened to their channel list.

ntl CR3 video

Changing the picture settings

ntl CR3 audio

Never seen this before with digital TV, the ability for the box to sound an alert, with Sky boxes you can only sound a beep, and that’s only if there’s an error or if there are subtitles on programme being watched. Three alert sounds are available. Sadly this feature was cut when they migrated to the Virgin UK1 software.

Parental control PIN

Favourites

Favourite channels can be viewed in a list form the channel banner

Listings for favourite channels can also be viewed whilst watching a channel.

Error Messages

These were common back in the day 😉

di4001 start up
Firmware Update, also appears when the STB is booting
Di4001 error message
No listings loaded
No signal being received
No Smartcard

Network Status

Press Page Up, Page Down and then Blue to access

Pace Di4001 Adventures

I wanted to see if this box themself would still work on a modern Virgin media network. I’m aware that Virgin broadcast all their channels in MPEG4 which this box cannot decode, aside from some radio channels. But I was still interested if the box would work and how it worked, especially in regards to early digital cable TV.

The box itself

Pace Di4001 ntl

Pace Di4001 size comparison with the Pace 2500S5, a typical Sky box of the same era

Trying to get started

So I got off to a rocky start trying to get the box to start up in the first place, since powering it on the display would show PACE followed by TUNE. I figured that i needed to enter the boxes engineering mode to reset something. This provided impossibale since after attempting to enter the engineer mode, the box would immediately show TUNE on the front panel display

i tried different combinations that I found online to get the box to work but nothing was working. Finally i stumbled on a old forum post that held the solution;

So to summarize, If your set top box wont progress past TUNE (shown on the front panel display) and you are unable to enter into the boxes engineering mode, you may need to reset the STB’s NVRAM since it may have become corrupted. This can occur when the STB has been powered off for a while, and the battery has discharged to a point where it is running under voltage. This must corrupt the NVRAM in a way it becomes unreadable to the STB

To recover, you will need to open the box, and pull a red jumper located to the right of a large white Sanyo battery. Leave the jumper out for about 5 minutes and then reconnect the jumper. Power on the STB and hold down the UP and DOWN buttons on the front of the box for 10 seconds. You should see DIAG on the front panel display and the engineering mode should appear after a few seconds.

Pace Di4001 PSU
note the red jumper in the middle, situated between the white Sanyo battery and that big red thing

Doing this will clear the Netid of the box, which the Di4001 boxes are able to set automatically if they are in an original NTL area. Otherwise it will appear as *****

After resetting the NVRAM I was able to get to box to enter it’s engineering screen.

Engineer Mode

From here you can change the default frequency and symbol rate, which the box uses to look for the latest software, and possible where the ntl EPG listings are located. You can also see info relating to the software version running on the box, Memory and flash info

There are a few interesting items here, mainly the memory address section. from here i was able to find out the spec of the box. 0x1000000 converts to 16777216 which I would say is 16Mb of RAM. The Flash storage being 0x00400000 that converts to 4194304 which i’d say is 4Mb.

This model of box does have less Flash compared to the older revisions of the Di4001 in favor of more RAM, maybe the OS is compressed into Flash, which is then extracted upon boot into RAM, and runs from RAM like a Ramdisk. Alternatively, there may be a basic guide stored in flash, with the remaining components loaded from ntl either directly broadcast or using it’s DAVIC modem.

Also it appears this box is the 2A revision of the Di4001. which the boot-loader being compiled in September 2000

If you want to boot the STB without a cable feed connected, hold down the up OR down button on the front of the STB when PACE appears on the display (immediately after applying power to the box), and release until it shows boot, or after 10 seconds. This will skip the default frequency checks and will load the main TV guide interface, even without a cable feed connected.

Doing this trick allowed be to bypass the default frequency check and put the box into some sort of ‘safe mode’, this it it would load the TV guide without having any channels or listings loaded. In this mode the box is stuck on channel 0 and not all aspects of the guide can be accessed.

I’ll put up some screenshots of the guide software up later, if I can get the box to pick up Virgin’s tv guide…

One oddity was the services button on the front panel of the box, now you would think that it would take you to the main TV guide, however it just make the mini guide appear and disappear from the front panel there is no way to access the main TV guide screen…

Another oddity was that pressing the front panel buttons would cause the remote light to indicate, even though you were pressing the front panel buttons and not the remote.

Conclusion

Unfortunately I was unable to get the box to tune into any frequency, never-mind booting with some sort of TV guide. At first I assumed it was because the network information Virgin Media broadcast in my area was not in a compatible format, or that the box was looking for something that Virgin have since removed from the stream, however I am now convinced that the tuner in the box is most likely faulty, since entering correct frequency’s in the engineer screen yields no change to the signal levels, even after removing and reapplying the coax cable.

Also since the box is running relatively old software (from around 2005), it’s likely the box was an ex-subscription box that was never returned to ntl, or may have had it’s flash chips modified to be read only, preventing a software update from taking place.

Lifting the lid

Pace Di4001 internal
Di4001 inside

Compared to other set top boxes of the era this ones quite busy inside considering it’s supposed to house a digital cable receiver and a cable modem in one enclosure. Ill try my beast to break down the individual processors this box contains;

C-CUBE AViA-600L
MPEG2 decoder

The main decoding processors, the one on the left (C-Cube 600L) is the MPEG2 decoder, not sure of the one on the right?

Hitachi SH3 Pace Di4001
Hitachi SH3 CPU

The one on the left is an Hitachi SH3 processor, if you’ve ever opened a Sega Saturn or a Dreamcast you should be familiar with the Hitachi CPU’s. The one on the right is a mystery, its branded as Pace but I cannot find and information online regarding it. I suspect its something to do with Nagravision based on the fact its near the smart card area. Maybe Pace had to licence their own Nagravision descrambler?

C-Cube AVIA

C-Cube Avia-inx – Handles DVB-C demuxing from the tuners, Ethernet controller, IEEE1284 controller and has a built in graphics processor. Basically like the northbridge/chipset on a pc.

The system memory, unlike other STB’s of the era this one is designed to be upgradable but seems to be using a proprietary slot. Virgin Media could easily upgrade the memory of these units should the box be returned. This model currently has 16Mb.

BCM3120

DAVIC/DVB-RC decoder, was underneath the smartcard slot so I had to get a funny angle

Pace Di4001 smsc

I believe these are for the onboard ethernet and serial ports

Pace Di4001 Front panel
Di4001 front panel

The front panel exposed, note the two IrDA sensors

Rear Panel

Pace Di4001 back panel
Di4001 back panel

From Left – Right

  1. Mains Input
  2. RF Output
  3. Audio phono out
  4. TV and VCR Scart
  5. IR output and input – I think were were meant for external devices such as Tivo or VCR’s to control the STB without any dongles needed, whilst never used by ntl the box does supply power though these connectors allowing the use of red eye dongle
  6. Ethernet – For internet access or LAN
  7. RS232 – Only used for libdebug, never used by ntl externally. Could be used for external input devices like a mouse or keyboard
  8. IEEE1284 parallel port – never used, might be for external disk drives, printers or modems
  9. Cable Input