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  Goldphone CLM50Hz Service Closure

Telstra has made the decision to ABANDON every Goldphone Owner in Australia and discontinue providing the 50Hz Customer Line Management (CLM50) service that Goldphones require to correctly charge for calls as of: 

JUNE 2009, So it's R.I.P Goldphone on 01/06/2009

Despite the extensive continued usage of Goldphones across Australia, Telstra justifies closing the CLM50 service under the grounds that the CLM50 service is old, problematic and obsolete. 

Despite this, the alternative service that Telstra offers; CLM12Hz will reportedly cost $450/Year JUST TO CONNECT (no call charges included in this) and to add insult to injury, require you to buy a brand new compatible payphone for BIG $$$. All that expense, and industry experts say that CLM12hz it may also have it's own share of temperamental problems anyhow.

For a limited time, we will accept a Goldphone as a $100 trade-in when you buy a Yellerphone! Your new Yellerphone could end up costing you as little as $500!

According to Access Communications, 2007:

 "The 12kHz metering system will only work in situations where the cable between the exchange and the customer's premises is not conditioned i.e. does not have any line-amplifiers, loading coils (3.4KHz maximum transmission limit), signalling repeaters, hybrid amplifiers etc"

Also; "The switching matrix in a digital PABX/KSU at a customers premises typically operates at a speed of 8kHz. If the 12kHz metering pulse is allowed to interact with the PABX/KSU 8kHz switching speed (due to incorrect design or connection of the band-pass and band-stop filters), a 4kHz modulated signal is generated for each 12kHz metering pulse that is received. This causes audible noise over the conversation and unreliable 12kHz metering detection." 

 

YELLERPHONES are DIFFERENT, INTELLIGENT, AND BETTER!
Yellerphones are NOT reliant on Telstra CLM12- They are the obvious low cost, budget Goldphone replacement alternative.

WHY? Unlike meter-based phones such as Telstra bluephones and goldphones, Yellerphones have on-board intelligence that utilises a time and area-code based database to determine call charges; The database can be set up to customer requirements to charge different rates against certain area codes, block all premium numbers, and can even be updated remotely over the air!  

BUY OR RENT A YELLERPHONE AND LEAVE TELSTRA's Expensive CLM FOREVER!

 

Letters from telstra regarding the closure of the CLM 50hz service for goldphones:

 

Telstra closing 50Hz Metering

21st Nov 2007

Important notice regarding Telstras Customer Loop Metering 50Hz service

 

Dear Customer

 

As you may be aware, Telstra has embarked on a major transformation journey. We have a clear goal to deliver world-class communications to you and your business. Its why, as part of our transformation journey, we are continually reviewing our products and services.

 

 

Review of the Telstra Customer Loop Metering 50Hz service

As a result of our regular review process, from 21 December 2007, we will no longer install new Customer Loop Metering 50Hz services or make changes to existing services.

 

Your Customer Loop Metering 50Hz (CLM50) service has allowed you to determine the cost of a call using a private payphone, call charge meter, telephone information management system, PABX or similar system and charge users for any calls made.

 

 

Supporting your business

We understand the significance these changes may have on your business and we are committed to supporting your individual requirements. Should you require additional services, we will work with you to find the right alternative solution that best suits your business needs. The right CLM50 alternative solution will depend on the way you currently use your service.

 

We look forward to continuing to provide you with the best solutions for your communication needs.

 

LETTER II

 

6 March 2008

 

 

 

    Important notice regarding your Customer Loop Metering 50 Hz meter pulses (CLM50) service

 

 

Dear Customer,

 

Further to our letter of 21 November 2007, please be advised that the CLM50 service is planned to be withdrawn on 30 May 2009. On and from 21 December 2007, Telstra stopped installing CLM50 services for new and existing customers. In addition, existing customers can no longer add new CLM50 services, or make any changes to their services.

 

CLM50 is the Telstra network feature allowing you to determine charges for your customers for phone calls made. Our records show that your service affected by the CLM50 closure listed below is most likely a payphone.

 

 

If your phone automatically recognises CLM12kHz signaling, your service will simply change to CLM12kHz signaling when CLM50 is closed. However, if your phone is not CLM12 compatible you will need to upgrade your equipment if you choose CLM12.

 

 

Telstra would like to work with you to help you successfully find a new solution and identify whether any adjustments or upgrades to your existing customer operated payphone is required.

 

What you need to do

 

Please contact our Customer Enquiry Centre on Freecall 1800 731 472* and quote 6565 between 9am and 5pm (AEDST) Monday to Friday for further information on your payphone compatibility and  migration requirements or to discuss the alternative solutions.

 

Yours sincerely

 

 

Also see details at this Link: http://www.telstra.com.au/services/catalogue/products/customer_loop.html

 

Read more below about the CLM50 and CLM12 service if you are technically minded........

Click to access circuit diagrams and description of CLM 12 khz, CLM 50 KHz (applies to Diamond Bluephones, Telecom Goldphones and Telstra Smartphones)

Most Telstra exchanges in Australia have the option to send a 12kHz signal (pulse) over the speech pair to the customers premises for each registration that is recorded by  the customer's call-metering-circuitry in the telephone exchange. This allows customers to calculate their call-charges. Because each meter-registration is charged a fixed rate, simply counting the number of registrations gives the customer an approximation of the call-cost. Third-party hardware or software at the customer's premises is used to record these 12kHz pulses.

In Australia, a single call-billing registration occurs at the successful connection of a local call. In contrast to many other countries, local calls in Australia  are un-timed and cover the geographic area of several telephone exchanges. As an example, a call from Avalon (one of Sydney's most northerly suburbs) to Sutherland (one of Sydney's most southerly suburbs) is an un-timed local call and will record just one meter registration.

For long distance (STD or IDD) calls, meter pulses are sent at a pre-defined interval, the time between successive intervals being determined by the location of the called party. As an example, an STD call from Sydney to Perth may receive a meter pulse every 60 seconds whilst an IDD call to Hong Kong may receive a meter pulse every 35 seconds.

Before the introduction of the 12kHz meter pulse system, a 50Hz metering pulse was used to operate customer's call-charge recorders. This 50Hz longitudinal pulse is transmitted from the telephone exchange over both legs of the telephone line. The detection equipment at the customer's premises depended on the provision of a low impedance earth at the customer's premises for correct operation. Amongst other problems, these 50Hz pulses were sometimes subject to interference from the 50Hz 240V electricity mains and were sometimes unreliable because of earthing problems at the customer's site, lightning strikes or a rise in the earth potential.

The 12kHz metering system will only work in situations where the cable between the exchange and the customer's premises is not conditioned i.e. does not have any line-amplifiers, loading coils (3.4KHz maximum transmission limit), signalling repeaters, hybrid amplifiers etc. The maximum line limits of unconditioned cable are shown in the following table. These limits equate to approximately 22db at 12kHz.

Cable Gauge Line Length
0.32 2.84km
0.40 4.20km
0.51 5.60km
0.64 7.00km
0.90 10.50km

* Most Telstra exchanges now support both the 50Hz and the 12kHz metering systems, with 12kHz meter pulses being the preferred option.

For correct operation of the 12kHz metering system, the addition of the 12kHz band-pass and 12kHz band-stop filters must be fitted to the CPE circuitry. This filter combination ensures that only 12kHz signals are passed to the Meter Pulse Detection circuitry whilst at the same time preventing 12kHz signals from entering the voice circuitry. The 12kHz band-stop filter must have at least 35db attenuation at frequencies between 11 & 13 kHz whilst at the same time reflect the standard complex VF impedance characteristics of a typical off-hook line condition. The 12KHz band-pass filter should provide minimal attenuation at frequencies between 11 & 13 kHz whilst at the same time reflecting a resistive termination impedance in the range of 200 to 400 ohms.

The switching matrix in a digital PABX/KSU at a customers premises typically operates at a speed of 8kHz. If the 12kHz metering pulse is allowed to interact with the PABX/KSU 8kHz switching speed (due to incorrect design or connection of the band-pass and band-stop filters), a 4kHz modulated signal is generated for each 12kHz metering pulse that is received. This causes audible noise over the conversation and unreliable 12kHz metering detection.

 

Many thanks to Copyright 2007 Access Communications Pty Ltd   ABN 62 002 111 659 for this explanation of the Telstra customer line management system.

   
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