New Specification for 2C Jackpoint: PTC226
As advised in Newsletter 158, we have been working with ModemPak (the manufacturer of Telecom’s own jackpoints) and MPT Solutions Ltd to select and test a socket suitable for replacing the ITT-Cannon socket specified in PTC 223.
At the same time it was realised that the reliability could be further increased by removing the capacitor and all the unused pins from the BT socket, which allows considerably increased clearance between the two pins (pins 2 & 5). The ringing capacitor is only required for 3-wire CPE, none of which has been Telepermitted for over 10 years. A "guessimate" would suggest somewhere between 1 in 50 and 1 in 100 phones in service are still 3 wire.
PTC226 is now available from the website http://www.telepermit.co.nz/PTC226_2006.pdf. Note that PTC223 Telepermits remain valid, and will continue to have a market as replacements where 3-wire phones are encountered. Once the stock of 2 wire sockets runs out, external ringing adapters will be required to enable 3-wire phone to ring.
Richard Brent
Access Standards
