Recent Changes - Search:

Resources


IP PBX Systems


Telephony Switch


Phones


Access Gateway
Signaling Converter


Lawful Interception Recorder


Others


Discontinued Products


Main Domains


In Social Media


About Us
Contact Details





.

X1_Resources_And_Some_Circuits

System Resources

The Telesis X1 TDM - IP Telephony Switch`s common control function is implemented in a centralized manner. The control and switching module, including industrial CPU, digital signal processors, memory elements, switching matrix, HDLC handlers, and all other service circuits, is duplicated for full hot stand-by redundancy.

Improved speed, security, and reliability are guaranteed by the placement of the generic programs and operating parameters in non-volatile semiconductor memory elements. The core of the X1 and the essence of its technological sophistication is the control and switching unit.

A large number of technological factors have influenced the final design specifications of the X1. A typical example is the selection of a central processing unit which is much effected by massive increase in computing power of and large number of software development tools available industry. The X1 is based on an industrially standard processing unit. System-wide processing operations are thus carried out on this unit.

The estimated system recovery time for both manual and automatic restart of the system is very short (a few seconds only).

Redundancy

To ensure the system reliability, there exists a hot stand-by redundant control and switching module in the Telesis X1 TDM - IP Telephony Switch. The control and switching module, including industrial CPU, digital signal processors, memory elements, switching matrix, HDLC handlers, and all other service circuits, is duplicated for full hot stand-by redundancy. The duplicated control and switching circuits and devices in detail are:

Each control and switching module has its own DC-DC converter. Furthermore, AC-DC rectifiers are with redundancy.

Memories

The non-volatile (NV) type memories in the Telesis X1 TDM - IP Telephony Switch are used for storing:

  • Boot program
  • Operational software Xymphony
  • Programmed parameters
  • Voice records
  • CMDR call records (tens of thousands of call records)
  • System records

NV memories are solid state integrated circuits and never loose data in case of power failures even for a long period of time. Volatile memories (RAMs) are used for running the operational software (firmware) Xymphony within the X1.

Ethernet Interfaces

10/100 BaseT ethernet interfaces on the Telesis X1 TDM - IP Telephony Switch provide numerous IP Telephony applications and system management solutions. Some of these are:

  • Web based system management
  • CMDR collection
  • System alarm and warning messages collection
  • Statistics data collection
  • Voice (conversation) records collection
  • Xymphony API server and client communication
  • H.323 protocol support. Connections between the system and H.323 entities.
  • SIP Session Initiation Protocol support. Connections between the system and SIP entities.
  • xSIP (eXtended SIP). Connections between the system and xSIP terminals

TDM and IP Interfaces or Users

The Telesis X1 TDM - IP Telephony Switch supports, at least, the following hardware interfaces and signaling:

  • analog subscribers (extensions, FXS, central-battery trunks in some other terminology)
  • analog DC loop trunks (FXO in some other terminology)
  • 4B+1D digital subscribers
  • SIP entities
  • H.323 entities
  • RDTT ports (ring-down tie-trunks, local-battery trunks in some other terminology)
  • analog E&M trunks
  • E1 CAS 2 bit CIS signaling interfaces
  • E1 CAS 1 bit E&M emulating interfaces
  • E1 CAS 2 bit ITU-T R1 signaling interfaces
  • E1 CAS 2 bit ITU-T R2 signaling interfaces
  • E1 ISDN DSS1 Primary rate NT signaling interfaces
  • E1 ISDN DSS1 Primary rate TE signaling interfaces
  • E1 ISDN QSIG Primary rate NT signaling interfaces
  • E1 ISDN QSIG Primary rate TE signaling interfaces
  • E1 ITU-T SS no:7 ISUP signaling interfaces
  • E1 ETSI V5.2 Local Exchange LE signaling interfaces
  • E1 ETSI V5.2 Access Network AN signaling interfaces

System Synchronization

The synchronization algorithms in Telesis TDM - IP Telephony Switch provide two basic modes of synchronization - with external synchronization source and with internal clock. In case of external synchronization source, input for reference clock is signal with 2048 kHz and, amplitude and impedance according to ITU-T Rec. G.703, that is E1 interface.

The Telesis system may be programmed such that;

  • It may be the master (uses its own internal clock), or
  • It may be a slave and tries to synchronize an external clock from one or more E1s

and if it fails (master clock is not available), it passes to the free running mode. In case of external synchronization source: with reference to jitter, wander and slip probability, the synchronization subsystem meets ITU-T Rec. G.823 and G.822. In case of internal clock: the synchronization subsystem includes a clock (clocks) with long- term stability better than 5x10-5, acc. to ITU-T Rec. G.812, MTBF for the internal clock (with stand-by module) is 100 years.

Traffic Handling Capacity

The Telesis X1 TDM - IP Telephony Switch has been tested with over 300,000 Busy Hour Call Attempts (BHCA) without any loss in the quality of service. The X1 employs a high-capacity switching matrix. The advanced design incorporates state-of-the-art Industrial CPU and Digital Signal Processors that are capable of executing hundreds of millions of instructions a second. Such highly efficient use of the system`s resources, with the help of intelligent algorithms, leaves very little, if any, possibility that an overload condition will arise.

The Telesis X1 TDM - IP Telephony Switch allows 8,192 H.323 endpoints or SIP user agents to be registered Furthermore, the Telesis X1 TDM - IP Telephony Switch allows up to 2,160 IP to TDM (or TDM to IP) calls at the same time (i.e., concurrent calls). In the operation of the X1 TDM - IP Telephony Switch, there is a sufficient margin for overload situations.

Traffic measurements of the X1 TDM - IP Telephony Switch provide the data base from which the dimensioning, planning, operation and management of the telephony network are carried out. Information gathered from these measurements can be used for identifying the traffic patterns and distribution on a route and destination bases, determining the amount of traffic in the switching system and the network, monitoring the continuity and grade of service.

Print - Recent Changes - Search
Page last modified on April 18, 2013, at 01:41 AM EST
Subject to change without any notice. All rights reserved 2010 - Telesis A.S.
Iskitler Cad. No.68 Ankara, TURKEY. Tel: +90 312 3840540 Fax: +90 312 3840549 http://www.telesis-pbx.com