Network Test, Monitoring, and Surveillance Solutions for TDM, VoIP, & Wireless Networks
GL provides a variety of solutions for network wide monitoring and surveillance. The solutions consist of:
- Intrusive and non-intrusive "probes" for TDM, VoIP, and Wireless networks
- These probes deployed at strategic locations in a network can transmit and collect voice, data, protocol, statistics, and performance
information, and relay this information to a central / distributed network management system (NMS)
- The NMS may be client server based or WEB based system and consists of a database and applications for controlling, collecting, and
analyzing the information provided by the various probes
GL's current NMS solutions are:
Packet Monitoring and Surveillance System
This system uses GL's Ethernet probe called "PacketScan™" to monitor packet flows in real-time within a VoIP network. All major VoIP
protocols are supported including SIP, H.323, Megaco, and MGCP. PacketScan™ also performs detailed analysis of voice band streams gathering
QOS statistics such as MOS (Mean Opinion Score), total packet count, reordered, duplicate and missing packet counts, gap, jitter, and delay. A central database
stores the real-time and historic data. The system also facilitates various views using a web interface.
The essential elements of the Packet and VoIP monitoring system are:
- "PacketScan™" probe gathers IP packet information in a non-intrusive fashion and forward
call detail records (CDRs) and statistics to a central database
- A central database stores the data collected by the probes
- A WebServer provides real-time and historic views of the data through various "browser based" clients using a web interface called
For more information please see our system description of VoIP & IP Monitoring system.
Digital T1 / E1 Line Monitoring, Test, and Diagnostic System
GL's T1/E1 Network Monitoring System provides network wide management of T1 and E1 lines including line health, intrusive diagnostics, non-intrusive
monitoring, and much more. Maintenance engineers can securely access the network view from literally "anywhere" that Internet access is available.
They can also monitor, diagnose, and troubleshoot remotely with simple to use scripts.
Essential elements of the system are:
- PC based T1 and E1 probes that collect physical and line level status and performance information. The Intrusive and
Non-intrusive "probes" for TDM networks are deployed at strategic locations in a network. They can transmit and collect voice, data, protocol, statistics, and
performance information. These probes can relay information to a central / distributed Network Management System (NMS). They communicate with the NMS
via TCP / IP communication.
- A "T1 E1 J1 Switch" for non-intrusive monitoring or intrusive diagnostics; the switch is "fail safe" during power disruptions
and USB controlled by the PC that houses the probes.
- The NMS provides an instant overall graphical view of the health of the TDM network with drill down to individual lines; secure access through WEB; remote
monitoring and diagnostics to troubleshoot any T1 E1 line; and a central database and applications for controlling, collecting, and analyzing the information
provided by the various probes.
For more information please see our system description of Digital T1/E1 Line Monitoring System.
SS7, ISDN, and Wireless Protocol Monitoring and Surveillance System
This system provides a uniform method for monitoring the various protocols and content of TDM, VoIP, and Wireless networks. Intelligent protocol analyzers
extract relevant content and supply this to a central NMS for storage, display, and control.
Essential elements of the system are:
- T1 E1 / T3 E3 / OC-3 Hardware probes that monitor many protocols, including ISDN, SS7, GSM, CDMA, and others, (visit protocol analysis page
for list of protocols). These probes can process protocol information at varying levels (intelligent software) to extract information of choice and communicate
with the NMS through TCP / IP. Probes can process multiple protocol links with a digital cross connect providing the link aggregation.
- NMS features include a central database for historical and near real time data storage, a WebServer for "browser based" access to information. Records
are stored into a relational database (Oracle, DB2, Sybase, Microsoft Access….) using ODBC. The web-based client NetSurveyor™ connected to SS7
and ISDN probes through a web server facilitates result display using a web interface.
For more information - please see SS7, ISDN, Wireless Protocol Monitoring and Surveillance System.
Voice and Data Quality Testing and Monitoring System for any network
This system provides real-time voice quality measurement across a diverse set of networks. Voice calls are automatically placed between end points;
quality is measured and provided for display at an NMS. Voice measurements include MOS (Mean Opinion Score), round trip delay (RTD), jitter, clipping, voice
The essential elements of this system are:
- Intrusive Wireless / Wireline / VoIP Nodes - GL's VQuad™, is a low density network probe used for proactive testing of end-to-end voice
connections. At each node, VQuad™ establishes calls, and send / receive voice files in real-time in an end-to-end manner. Specific nodal hardware is
available for connection to TDM, and wireless phones with automatic call control. Wireline and VoIP nodes can connect to TDM, 2-wire, or VoIP network
elements. Received voice (degraded) files are transmitted to a Command Center for analysis.
- The Command Center controls the "Nodes". It controls, schedules, and analyzes the degraded voice traffic received by the Nodes.
Advanced features include real time monitoring, scripting of voice calls, scheduling of tests, Voice Quality Testing (VQT), round trip delay (RTD) calculations,
and much more. The Command Center includes a database for storage and retrieval of all quality information. Voice Quality Testing (VQT) software
compares the two files ('reference' and 'degraded') and provides an ITU-standard score (PESQ, PESQ WB, PAMS, & PSQM).
- The system also facilitates result display using a simple web browser application WebViewer™.
The results are accessed from database that stores real-time and historic data
For more information - please see Intrusive Voice Quality Test and Monitoring System
Voice Band Analyzer Probes to capture, analyze, and measure voice-band quality over VoIP, TDM & Wireless networks
The Real-time Voice-band Analyzer (VBA) is an analysis tool for capturing and monitoring the quality of voice band traffic over
VoIP, TDM and wireless networks. VBA works in conjunction with GL's TDM, Packet, and Wireless non-intrusive capture products:
- VBA with GL's TDM T1 E1 Call Capture and Analysis, or
- VBA with GL's VoIP PacketScan™
- VBA with GL's GSM, CDMA, and 3G Call Capture Products
VBA instantly detects voice file captures and with appropriately installed analysis modules, monitors speech levels, noise levels,
and line echo.. Other analysis modules such as ITU-T P.561, P.562, P.563, fax and modem analysis, and many others
can be hosted as plug-ins.
The VBA application can also operates on pre-captured files, making it a near-real time. This package has been designed to work
with other GL Communications Inc. tools such as PacketScan™, Call Capture and Analysis, and many other recording tools. It supports
A-Law, µ-Law, 16-bit PCM (Intel), 16-bit PCM (Motorola) and MS Wave file formats. The VBA web server provides real-time and historic
views of the data through various "browser based" clients using a web interface called VBAWebViewer™.
For more information see the Voice Band Traffic Monitoring System.
For more information - please see T1 E1 Line Monitoring, Test, and Diagnostic System.