TELECOM ACCESS STANDARDS NEWSLETTER NO. 159

May 2006

CONTENTS
1. ISDN Primary Rate "Lite" : TNA 136
2. PTC 200 Re-issue
3. New Specification for 2C Jackpoint: PTC226
RETURN TO MAIN INDEX



1. ISDN Primary Rate "Lite"

A new product called ISDN PRA Lite has been developed for medium to large businesses that do not require the full feature set of Telecom ISDN PRA

The reduced feature set compared to Telecom’s full ISDN PRA service is follows;

  • CLIP – Caller Line Identification Presentation
  • CLIR – Caller Line Identification Restriction
  • DDIPG – Direct Dial In for Primary Group
  • ISDN Date and Time
  • NCA, NCAM and NCAI Non Code Access, Mobile and International
  • D Channel per PRA Link e.g. no shared D channel
  • Series completion is not available therefore limited to 30 channels per group

A specification, TNA136 has been published on the Access Standards Website: http://www.telepermit.co.nz/TNA136.pdf. This specification covers the differences between PRA Lite and TNA 134. Telepermits will be granted in a new series, PTC233 for PRA Lite compatible CPE. The criteria for a PTC233 Telepermit will be as follows:

  • A compliant ETSI TBR4 test report (Test reports which call up this standard such as AS/ACIF S.038 will also be acceptable)
  • A compliant AS/NZS60950 (or equivalent) electrical safety test report
  • A compliant AS/NZS55022 (or equivalent) emc test report
  • A clause by clause manufacturer's statement of compliance or test results against TNA 136.


2. PTC 200 Re-issue

Since PTC200 was last issued in 1998, there have been a number of minor changes which have been promulgated through Access Standards Newsletters. PTC 200 has been reissued with these changes incorporated, and is now available on the website as a .pdf document http://www.telepermit.co.nz/PTC200.pdf.
The changes which have been included are as follows:

  • Updating of references, e.g. change from CCITT to ITU-T etc.
  • 4.10 Changing of LR limits (Newsletter 130), removal of requirement to measure LRs against different line lengths.
  • Delete clause 5.4 and all other references to Decadic signalling.
  • 5.5.2(5)(a) Changes to requirements for dial-back requirements for Caller ID units to take account of 10 digit local numbers (Vodafone: '21'+ 8 digits).
  • 10. 3 wire CPE no longer acceptable for Telepermitting.
  • Delete clause 10.7.3 on Distinctive Alert decoders.
  • 11. Delete clauses other than Caller ID.

  • 11.1.4(4) Additional test required with CSS preamble starting 60ms after first ringing cadence.
The original html version will remain on the website for cross reference in the meantime. The main differences from a testing perspective are that for some classes of product, there will be fewer tests required, and in some cases different limits.


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