This paper describes the adaptation and certification process for switching equipment to be used in the Russian public switched telephone network (PSTN). The first part of the paper illustrates the basic certification procedure and its essential steps. Each step, whether it is described in a natural language or formally in a specification language SDL, is an integral part of the certification p...

This application note presents guidelines for measuring whether a design is compliant with AT&T 62411 jitter tolerance, jitter generation and jitter attenuation requirements. 62411 compliance is a necessary requirement for CPE (Customer Premises Equipment) which is connected to T1 lines provided by AT&T. These T1 lines may be either private-line or centraloffice access lines. 62411 may not appl...

The electrocardiograms of ambulatory patients have been monitored over the telephone by staff of the intensive cardiac care unit using equipment in the unit. Telephone monitoring is a useful way of diagnosing transient symptomatic arrhythmias and a reliable aid in supervising the patient's rhythm at the beginning or end of treatment. The doctor has direct contact with the patient at the time of...

No one likes to wait long when the telephone is out of order. Maintaining customer telephones is a significant problem for telephone operating companies because delays in fixing troubles mean dissatisfied customers. Moreover, the high costs of maintenance adversely affect the profits of the telephone companies. Within NYNEX (a regional Bell operating company and the parent company of New York T...

In recent years have seen rapid progress in the construction of IP-VPN networks by carriers and new services have been born in that climate, enabled by the ability to process data and voice on the same network. As part of this trend, the time is right for the business of outsourcing of carrier telephone services. For this reason, we developed an improved model of IPstage*1) intended for use by ...

This master’s degree thesis project has been performed at the department for Access Signal Processing (ASP) at Ericsson AB in Älvsjö. Among other things this department does research concerning DSL (Digital Subscriber Line) technology. DSL provides fast data transfer over ordinary telephone lines. The advantage of using telephone lines is that almost all premises in developed parts of the world...