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Press Release: GL Announces Enhanced
ML-PPP & PPP Emulation & Analysis

Gaithersburg, Maryland, USA - April 6, 2009 - GL Communications Inc., announced today the release of enhanced ML-PPP & PPP Emulation & Analysis software. Announcing the news to the media, Mr. Karthik Ramalingam, Senior Manager at GL said, "MLPPP bundles multiple link-layer channels into a single network-layer channel. Data sent through this channel is distributed among all the links. GL's flexible and versatile MC-MLPPP Emulator is both GUI and script based. The software is capable of generating and receiving MC-MLPPP and PPP traffic (with or without impairments). Traffic source can be sequence number, HDL files (containing packets/frames), flat binary file, user-defined frames (ASCII HEX file), and Ethernet data”. He added, “The Multi-Class Extension to Multi-Link PPP allows a sender to fragment the packets of various priorities into multiple classes of fragments, and allows high-priority packets to be sent between fragments of lower priorities”.

Mr. Ramalingam further added, “MC-MLPPP emulator can now be configured as a router or as a Bridge to establish connections and route traffic between LANs. The software runs on GL's T1 E1 Analyzer platforms which are available as powerful HD PCI cards as well as portable USB based units”.

MC-MLPPP using Client-Server

GL's MC-MLPPP Emulator allows traffic generation and verification over PPP links using industry standard Client-Server technology, which may be accessed through a GUI for manual testing or through command line scripts for automation.

Important enhancements introduced to the application

  • ML-PPP Emulator as a Router

    The Emulator allows users to setup routing table by configuring IP-Address and Mask. Once configured, the Emulator forwards the IP packets which match routing criteria over T1/E1 links. Emulator respond to all ARP requests whose IP addresses present in routing table

    The emulator allows mapping of user defined class of service into MLPPP class/PPP Link based on length, source IP address, destination IP address and Type Of Service of the received IP packets, set in priority dialog table.

  • ML-PPP Emulator as a Bridge

    When the emulator is configured to act as bridge between two networks, all ARP and traffic (checked against the priority table) received from the network is encapsulated as BPDU (Bridging Protocol Data Unit) and streamed over T1 E1 links. The Emulator on another network removes BPDU header, either converts to Ethernet traffic or adds Ethernet header and streams to the destination.

  • IP compression

    MC-MLPPP Emulator supports the following IP compression standards: Van Jacobson Compression and IP Header Compression.

  • Impairments

    MC-MLPPP Emulator supports various impairments at PPP layer - CRC error, frame error, frame duplication, and more. Also supports various Fragment/Packet impairments for each Class at ML-PPP level.

Other Important features include:

  • Performs MC-MLPPP as well as PPP simulation

  • Supports LCP with the following negotiation options

    • PPP options: MRU (Maximum Receive Unit), ACFC (Address and Control Field Compression), PFC (Protocol Field Compression), and Magic Number
    • MLPPP Options: MRRU (Maximum Received Reconstructed Unit), Short Sequence Header Format, and Endpoint Discrimination
    • Multi-Class Options: Multilink Header Format

  • Supports the following NCP: IPCP: RFC 1332 and RFC 1877; BCP: RFC 3518

  • Transmit and receive Ethernet traffic over T1E1 links by operating either in bridge or router mode

  • Supports up to 8 T1/E1 links

  • Supports Fragmentation and Reassembly at MLPPP level

  • Dynamically add/remove (open/close) PPP links without loss in data

  • Support for HDLC framing with CRC16, CRC32 or without CRC

For comprehensive information on the product, please refer to MC-MLPPP Emulatior web page.

About GL Communications Inc

Founded in 1986, GL Communications Inc. is a leading supplier of test, monitoring, and analysis equipment for TDM, Wireless, IP and VoIP networks. Unlike conventional test equipment, GL's test platforms provide visualization, capture, storage, and convenient features like portability, remotability, and scripting.

GL's TDM Analysis & Emulation line of products includes T1, E1, T3, E3, OC-3, STM-1, analog four-wire, and analog two-wire interface cards, external portable pods, and complete system solutions. Capabilities include voiceband traffic analysis and emulation across all traffic types (voice, digits, tones, fax, modem), all protocols (ISDN, SS7, GR-303, Frame Relay, HDLC, V5.X, ATM, GSM, GPRS, etc.), and with capacities up to thousands of channels.

GL's VoIP products generate / analyze thousands of calls simultaneously with traffic types such as voice files, digits, video, tones, noise, and fax using G.711, G.729, AMR, EVRC, GSM and a range of other codecs. Additional features include visual analysis, real-time listening, and recording. The product line also includes a Software Ethernet Testing capability that checks frame transport and throughput parameters of Ethernet and IP networks.

GL's Voice Quality Testing (VQT) product line complements all of GL's products. Using ITU-standard algorithms (PAMS, PSQM, and PESQ), GL's VQT provides a widely excepted solution across the telecom industry. Voice Quality Testing across multiple networks (T1, E1, T3, E3, OC-3, VoIP, Wireless, and Landline) are all available.

GL's Wireless Products perform protocol analysis and voice quality assessment on GSM, CDMA and UMTS networks. Connections can be made to any wireless phone with automated call control, GPS mapping and real-time signal measurements.

GL's Echo Canceller testing solutions provide the broadest range of simulation and analysis, including compliance testing per G.168 and G.160 across TDM, IP, VoIP and Wireless networks. GL's wirelss VQT solutions help assessing impairments to voice quality such as poor mobile phone quality, voice compression and decompression algorithms, delay, loss and gain in speech levels, noise, acoustic and landline echo, and other distortions are easily assessed and accurately measured.

GL's Handheld data testers can test a wide variety of communications facilities and equipment including T1, fractional T1, E1, fractional E1, T3 and E3 modems, multiplexers, CSU, DSUs, T1 CSUs, DTUs, NTUs and TIUs and more. The testers provide convenience, economy, and portability for almost any interface, including RS232, RS-422, RS-530, X.21, T1, E1, T3, E3, and many others.

GL's Network Surveillance and Monitoring products include Probes for TDM, IP, VoIP, ATM, and Wireless networks. An open standards based approach provides a scalable, feature rich, real-time access to network intelligence. Centralized or distributed access, efficient transport and database loading allow compatibility with 3rd party and standards based monitoring systems.

For more information about GL's complete line of products,


Shelley Sharma
Phone: 301-670-4784 ext. 114

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