The Service Control Point

The SCP is essentially a data base server which responds to the SSP by sending the instructions for completing the call.

The SCP is based on a commercial reliable computer platform which meets the downtime specifications typical of telecommunications networks, including the capability to add processing power or change the software without interrupting service.

The smallest configuration of the SCP handles around 25,000 BHCA. As traffic grows in a network, each SCP can be grown to a capacity of around 1,000,000 BHCA with an average response time of less than 300 ms. A typical configuration is to put two or three SCPs in the network in a load-sharing configuration.

As traffic grows beyond this limit, the SCPs can be reconfigured so that each one handles a subset of the services. This is possible if the Global Title Translation function is implemented so that calls can be directed to the correct SCP. This type of reconfiguration can be effected without disturbing service.

The SCP complies with ITU-T and ETSI standards for the INAP and Italtel guarantees complete compatibility with new releases as the standards mature. It uses SCCP and TCAP according to the ITU-T White Book and TCAP according to the ETSI INAP standards.

The interface with the SMP is based on the standard OSI X.25 protocol so that it can be connected to equipment from other vendors.

The operating system of the SCP is Unix, which means that a wide range of support and development tools is available. Since the SMP is also Unix-based, there is portability of software between the two machines.

The use of Unix eases maintenance and installation problems, such as connections with existing LANs.

Italtel Societa' Italiana Telecomunicazioni Spa

Claudio Chiarenza, BUCT BPM
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Contact for Information: Claudio Chiarenza - BUCT BPM

All contents copyright (C) 1995.Italtel S.p.a. All rights reserved.
Revised: August 30, 1995