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MAPS™ MC-MLPPP Conformance Tester
(Scripted MC-MLPPP Conformance Testing)

MAPS™ MC-MLPPP Protocol Emulator Software Ver 4.9.19 | Download Now!


The Point-to-Point Protocol (PPP) provides a standard method for transporting multi-protocol datagrams over point-to-point links.

Point-to-Point Protocol - PPP (RFC 1661) is a link layer protocol, which encapsulates other network layer protocols like IP for transmission on synchronous (like T1/E1) and asynchronous communications lines. When transmitted over T1/E1 line, PPP frames are based on HDLC frame structure. The PPP encapsulation provides for multiplexing of different network-layer protocols simultaneously over the same link. Other optional facilities provided are authentication of the identity of its peer on the link, and determination when a link is functioning properly and when it is failing.

Multi-Link PPP (RFC 1990), bundles multiple link-layer channels into a single network-layer channel. A bundle can consist of multiple physical links of the same type or physical links of different types. Data sent through this channel will be distributed among all the links. It is a technique used to derive larger bandwidth pipe by aggregating smaller bandwidth pipes e.g. from multiple T1s or E1s. The protocol allows splitting, recombining, and sequencing datagrams across multiple data links into a single logical pipe or bundle.

The Multi-Class extension to Multi-Link PPP (MC-MLPPP) (RFC 2686), 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.


GL’s MAPS™ MLPPP is an advanced protocol simulator/tester for MC-MLPPP/MLPPP/PPP protocols over TDM (T1 E1). The tester can simulate a complete PPP/MLPPP link between two peers (Router or a Switch), with MLPPP signaling conforming to IETF specifications..

The MAPS™ MLPPP supports testing network elements, error tracking, regression testing, conformance testing, and load testing/call generation. The test tool can run pre-defined test scenarios against MLPPP test objects in a controlled & deterministic manner. The test tool also incorporates the flexibility to modify call parameters & message contents (arbitrary manipulation of messages, information elements and message sequence on the different protocols).

MAPS™ MLPPP conformance scripts, suitable for conformance tests and functional tests, where test objects can be accurately, reliably and comfortably validated for compliance with IETF standard. It is suitable for manufacturers, network operators and service providers to address all stages of the development cycle, regression testing through to type approval, acceptance testing.

The application gives the users the unlimited ability to edit MLPPP messages and control scenarios (message sequences). "Message sequences" are generated through scripts. "Messages" are created using message templates. The application supports powerful utilities like Message Editor, Script Editor, and Profile Editor which allow new scenarios to be created or existing scenarios to be modified using MLPPP messages and parameters.

GL also provides an independent GUI based PPP protocol analyzer (optional application – XX135) for online capture and decode of the signaling in real-time both during tests and as a stand-alone tracer for live systems.

Supported Protocols Standards

Protocol Stack
Supported Protocols Standard / Specification Used
Point-to-Point Protocol RFC1661
Multi-Link PPP RFC1990
Multi-Class Extension to Multi-Link PPP RFC2686
IPCP Extensions RFC1877

ISUP Call Simulation

Typical Call Flow Scenario
A typical signaling exchanged between two peers in PPP network is as shown below.

Typical MLPPP Negotiation Operations

Link Establishment Phase Conformance Test
MAPS™ MLPPP is configured with the conformance script to receive the Configure Request message and reply with a valid Configure-Ack. The test script is considered to be successfully executed, when the DUT sends the Configure-Nak suggesting new Magic Number.

Test Loopback using Peer Magic Number Conformance

Open Link State Conformance Test
MAPS™ MLPPP is configured with the conformance script to send the Configure-Request with Magic Number, Maximum Receive Unit, Protocol Field Compression, and Address Field Compression Fields parameters. DUT replies with Configure-Ack. Link should enter the Opened state.

Open State Conformance Test

General MAPS™ Features

Call Simulation and Control

The signaling and traffic simulation in a call is completely implemented using scripts. Commands in the scripts are executed in controlled way to simulate protocol and traffic behavior. Most of the commands used in the scripts are generic and independent of specific protocol.

MAPS™ application acts as either the Caller or resides at the network terminal acting as Callee. The Call Generation feature simulates an outgoing call by sending call control messages to the DUT using scripts and profiles. The profiles allow necessary parameters of call control messages to be changed during runtime. Call generated from other entity can be automatically detected in call reception window by pre-setting the required answer scripts in the Incoming Call Handler.

The call control scripts can also automatically handle the traffic over the established call. MAPS™ supports transmission and detection of various traffic types over  IP (RTP, GTP), ATM, & TDM - such as, digits, voice file, single tone, dual tones, fax, sms, email, http, ftp, and video. MAPS™ also includes support for wide range of codec rates – visit and webpage for more details.

Message Sequence - Each call scenario provides the trace with full decoding of the messages exchanged between the MAPS™ and the DUT, and graphical ladder diagrams of the call flow with time stamp. Impairments can be applied to messages to simulate error conditions that occur in real-time networks.

Event-Driven Control - Scripts execution, being event-based, allows redirection of script execution on-the-go with user-defined events. The custom parameters in the events can also be changed during script execution using event profiles.

Script Contents & Script Flow - The script flow and the contents window displays the Script Name, Sub-script Name, Script line number, and script statements to be successfully executed, which help the users in troubleshooting a particular call scenario.

Bulk Call Simulation and Load Testing

MAPS™ supports automated stress/load testing capabilities through Load Generation and Bulk Call Simulation features. Bulk Call Simulation allows quick configurations to easily create multiple test entries with different scripts and profiles. Multiple tests can be run simultaneously or sequentially (queue up tasks in succession). Load generation feature further allows specifying the patterns with which the bulk calls can be generated. Load generation can be customized with different statistical distribution patterns such as Uniform, Ramp, Sawtooth, Fixed, Normal, Step, and Step-Sawtooth distribution. Call duration also can be randomized using similar statistical distribution. This feature also helps users configure Stress/Load Testing parameters such as Call per second (CPS), Max Active Call, Minimum and Maximum Call Rates, Start Call Rates, and other parameters.


Scheduler can be used to schedule the simulation of bulk calls or manual calls at a specific start time. The pre-saved master configuration files for test setup and call simulation are automatically loaded to automate the test procedure.

Customization of Test Setup Parameters

The test setup profiles (.xml files) allow users to configure the necessary parameters in order to establish communication between MAPS™ and the DUT. It includes configuring parameters of the network nodes, the network properties, and transport related configurations such as T1/E1 timeslots, IP Address and port numbers for both MAPS™ and the DUT.

Once the transport layer is configured properly, protocol specific signaling messages and traffic can be transmitted and received successfully. All parameters setup in test setup are global and are accessible to all scripts. These parameters initialize protocol engines and the transport modules specific to the protocol.

Customization of Test Parameters, Call Flow, and Protocol Messages Using Pre-Processing Tools

  • Message Editor - The Message Templates (GL’s proprietary *.HDL files) comprises of protocol encoding parameters with preset values. It is required to create a message template for every message in a protocol. The message templates are called within the scripts to perform scenario based testing.
  • Profile Editor – Profiles (*.xml files) are used to change the values of the fields in the messages (i.e. Message Template in MAPS™) during the course of a call. The multiple profiles with varying parameter values that allow users to configure call instances in call generation and to receive calls.
  • Script Editor - The script editor allows the user to create / edit scripts and to define variables for the fields in the messages. The script uses pre-defined message templates to build call flow and perform send and receive actions. Script editor provides options to run the test for multiple iterations in sequential or random flow. Commands allow retransmission of messages with specific interval.

Command Line Interface

Supports scripting through a Command Line Interface (CLI) such as the Python, and TCL, using MAPS™ client-server functionality (requires additional license)

MAPS™ can be configured as server-side application, to enable remote controlling of the application through multiple command-line based clients. Supported clients include C++, TCL, Python and others. TCL provides a simple scripting language, with programming facilities such as looping, procedures, and variables. The TCL Client application includes a MapsTclIfc.dll file, a packaged library that enables communication with the Server from a TCL environment.

User can remotely perform all functions such as start test bed setup, load scripts and profiles, apply user events such as send digits/file/tones, detect digits/file/tones, dial, originate call, terminate call, start and stop traffic and so on. User can also generate and receive calls through commands. This client application is distributed along with MAPS™ Server application. Multiple MAPS™ CLI servers can be controlled remotely from single client application (such as TCL, Python, etc).

Call Statistics, Events, Link Status

Call Status & Message Statistics - By default, all call handling scripts (irrespective of the type of the functions) are assessed by MAPS™ to provide statistical information about Total Calls, Active Calls, Completed Calls, Passed Calls, Failed Calls, and Calls/Sec. It is also possible to categorize the statistical information as per the call handling scripts. In addition, Call Generation and Call Reception windows provide useful call status & script execution results.

In addition, Message Stats option for any specific protocol, logs number of times the messages are being transmitted (Tx Count) and received (Rx Count), thus allowing user to monitor the occurring events.

Events Reporting – MAPS™ provides Event Log, Error Events, and Captured Errors windows that log the captured events and errors encountered during the progress of the call.

Link Status - Link Status window indicates transport related information of the protocol, for example, if SCTP is used as transport, it indicates if the association is Up or Down in the Link Status window. MAPS™ IuCS ATM uses SSCOP transport and the associated link status is indicated as Up or Down in the Link Status window.


Screen Shot of MAPS™ MLPPP Testbed Setup Configuration Screenshot of Script Editor Screenshot of Profile Editor Screenshot of Message Editor

Screenshot of Script Contents and Script Flow Screenshot of Call Statistics Screenshot of Message Statistics Screenshot of Event Log

Buyer's Guide

Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.

Item No. MAPS™ for TDM Network
(requires T1 or E1 Hardware and Basic Software)
XX652 MAPS™ MC-MLPPP Conformance
XX648 MAPS™ ISDN & LAPD Emulator
XX642 MAPS™ ISDN & LAPD Conformance Emulator
XX649 MAPS™ SS7 Emulator
XX647 MAPS™ SS7 Conformance
XX692 MAPS™ GSM A Emulator
XX693 MAPS™ GSM Abis Emulator
XX651 MAPS™ CAS Emulator
XX694 MAPS™ MAP Emulator
XX696 MAPS™ CAP Emulator
XX656 MAPS™ INAP Emulator
XX682 MAPS™ IUP Emulator
XX624 MAPS™ FXO FXS Emulator (only for tProbe)
  Related Hardware

QuadXpress T1E1 Main Board (Quad Port– requires additional licenses) 

OctalXpress T1E1 Main Board plus Daughter Board (Octal Port– requires additional licenses)
PTE001 tProbe™ Dual T1 E1 Laptop Analyzer with Basic Analyzer Software
HTE001 Universal T1 E1 PCI Card with Basic Analyzer Software
UTE001 Portable USB based Dual T1 or E1 Laptop Analyzer with Basic Analyzer Software
Item No. MAPS™ for Wireless Network
  Related Software
PKS140 MAPS™ LTE S1 Emulator
PKS142 MAPS™ LTE eGTP (S3, S4, S5, S8, S10, S11 & S16) Emulator
PKS141 MAPS™ LTE X2 AP Emulator
PKS160 MAPS™ UMTS IuCS IP Emulator
MAPS™ UMTS IuH IP Emulator
PKS164 MAPS™ UMTS IuPS Emulator
PKS166 MAPS™ UMTS Gn Gp Emulator
LTS220 MAPS UMTS IuCS ATM Emulator over OC-3 / STM-1
requires LTS214 + LightSpeed1000™ Hardware; optional LTS217
LTS214 OC-3 / STM-1 SSCOP Server
LTS320 MAPS UMTS IuCS ATM Emulator over OC-12 / STM-4
requires LTS314 + LightSpeed1000™ Hardware; optional LTS317
LTS314 OC-12 / STM-4 SSCOP Server
PKS131 MAPS™ Gb Emulator over IP for BSC & SGSN
  Related Hardware
LTS100 Lightspeed1000™ - Dual OC3/12 STM1/4 PCIe Card
 Item No. MAPS™ for IP Network
MAPS™ MEGACO Conformance Test Suite (Test Scripts)
MAPS – MGCP Protocol Emulation with Conformance Test Suite
MAPS™ SIP Emulator
SIP Conformance Test Suite (Test Scripts)
PKS126 MAPS™ SIP I Emulator
PKS132 MAPS™ MAP IP Emulator
PKS151 MAPS™ CAMEL IP Emulator
PKS134 MAPS GSM Abis IP Emulator
PKS137 MAPS™ GSM A IP Emulator
PKS149 MAPS™ Skinny Emulator
PKS155 MAPS™ BICC IP Emulator
PKS136 MAPS™ INAP Emulator (ANSI, ITU)
PKS139 MAPS™ Diameter Emulator
Item No. Traffic Options
File based Record/Playback
Transmit/Detect digits (Place Call/ Answer Call)
Multi-Channel TRAU Tx/Rx Emulation and Analysis
PKS102 RTP Soft Core for RTP Traffic Generation
PKS200 RTP Pass Through Fax Emulation



PacketCheck™ - Packet GTP Traffic Simulation

Mobile Traffic Core-GTP

Mobile Traffic Core-Gateway

Mobile Traffic Core - GPRS Gb
LTS217 OC-3 / STM-1 AAL2 Traffic Core
LTS317 OC-12 / STM-4 AAL2 Traffic Core
Item No. Related Software
XX120 SS7 Analyzer Software
OLV120 Offline/ Remote SS7 Analyzer Software
XX100 ISDN Analyzer Software
OLV100 Offline/ Remote ISDN Analyzer Software
XX150 T1 or E1 Real-time GSM Protocol Analyzer
OLV150 Offline T1 or E1 GSM Protocol Analyzer
XX165 T1 or E1 Real-time UMTS Protocol Analyzer
PKS100 PacketGen™ with PacketScan™
PKV100 PacketScan™ (Online and Offline)
RTP Toolbox™
G.168 Echo Canceller Test Compliance Suite
PKV105 SIGTRAN Analyzer (requires PKV100)
PKV107 LTE Real-time LTE Protocol Analyzer (Requires PKV100)
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