WAI SUMLAI is with AT&T Bell Laboratories. ignaling protocols a re used in switching systems to support realtime procedures for the establishment and release of on-demand calls/connections. For broadband switching systems based on Asynchronous Transfer Mode (ATM), the ITU-T has defined Broadband ISDN User Part (B-ISUP) [ 11 as the network-node (network-to-network) interface signaling protocol. ...

The layering of protocols in critical infrastructure networks – exemplified by Modbus TCP in the oil and gas sector and SS7oIP in the telecommunications sector – raises important security issues. The individual protocol stacks, e.g., Modbus and SS7, have certain vulnerabilities, and transporting these protocols using carrier protocols, e.g., TCP/IP, brings into play the vulnerabilities of the c...

Road safety depends on a complex balance between all the factors that compose road system: user, vehicle, environment, and infrastructure. Directive 2008/96/EC introduces procedures to improve European Transport Network (TEN-T) safety, recognizing an important role for inspections, but focusing them freeways highways. This paper proposed methods criteria useful optimize current inspection adapt...

A PCS network constantly tracks the locations of the mobile stations so that incoming calls can be delivered to the target mobile stations. In general, a two-level database system is used to store location information of the mobile stations. When the location databases fail, incoming calls may be lost. This article describes the standard GSM database failure restoration procedure which reduces ...

In this paper we report on an ongoing statistical analysis of actual CCSN traffic data. The data consist of approximately 170 million signaling messages collected from a variety of different working CCS subnetworks. The key findings from our analysis concern: (1) the characteristics of both the telephone call arrival process and the signaling message arrival process, (2) the tail behavior of th...

This paper discusses how a switch-independent, network-wide monitoring system for 55? [1] networks can provide a powerful solution to managing the complex requirements of modem digital telecommunications networks. The proposed approach to 55? traffic monitoring allows the provision of a homogeneous view across networks independently of multi-vendor switch hardware and software, thus overcoming ...