NG
Some analogue cable networks are capable of carrying digital signals with little upgrade. In fact the majority should be - the technology used for digital cable transmission is pretty similar to that used for most single cable analogue systems - similar frequency bands etc. The reverse link is trickier I think - but again it is the street cable boxes which are more likely to need upgrades, not the individual house cable feeds.
Also BTs network is almost entirely digital and has been since the late 80s. The only remaining bit of analogue technology is the local loop between the subscriber and the exchange. As soon as your line gets to the exchange it is digitised - this is why it is now easy for BT to offer 1571 call answering etc.
noggin
Founding member
Quote:
drjones on 6:28 pm on Jan. 19, 2002
BBC912 has a point - at which point will analog cable be switched off?
I have a feeling it never will - because the entire network would need rplacing - and this causes a huge capital outlay. So there will always be analog cable, just like BT's network will always be analog. They can piggy back a digital signal onto it, but it will never be purely digital.
When the government refer to the 'analog switch off', thay only mean the termination of analog television, if they turned of all analog, then the police would be screwed, most taxi firms would be also.
BBC912 has a point - at which point will analog cable be switched off?
I have a feeling it never will - because the entire network would need rplacing - and this causes a huge capital outlay. So there will always be analog cable, just like BT's network will always be analog. They can piggy back a digital signal onto it, but it will never be purely digital.
When the government refer to the 'analog switch off', thay only mean the termination of analog television, if they turned of all analog, then the police would be screwed, most taxi firms would be also.
Some analogue cable networks are capable of carrying digital signals with little upgrade. In fact the majority should be - the technology used for digital cable transmission is pretty similar to that used for most single cable analogue systems - similar frequency bands etc. The reverse link is trickier I think - but again it is the street cable boxes which are more likely to need upgrades, not the individual house cable feeds.
Also BTs network is almost entirely digital and has been since the late 80s. The only remaining bit of analogue technology is the local loop between the subscriber and the exchange. As soon as your line gets to the exchange it is digitised - this is why it is now easy for BT to offer 1571 call answering etc.