Abis simulation was one of the first features provided by the Line
Server Unit (LSU), and it has been continuously improved since 1992,
with the addition of new protocol stacks with each technology evolution.
As Abis is a proprietary interface that connects network elements (BSC
- BTS) from the same vendor, telecom manufacturers have licensed PRISMA
Engineering to decode their protocols.
The LSU is dedicated to network protocol management relating to real-time
behaviour of the BSC. Protocol decoding and simulation intelligence are
external client applications running on multiple instances on a remote
site.
The LSU can perform monitoring concurrently with simulation (both
on the simulated interfaces and on those connected between real
node elements), thus avoiding the need of a separated instrument
and allowing a significant cost reduction.
Monitoring
The LSU has a powerful and user-friendly GUI for protocol decoding.
It is based on the popular open source protocol analyser Ethereal,
modified by PRISMA Engineering to support many telecom manufacturers'
proprietary protocols, such as: Abis Signalling, Abis O&M, TRAU frames,
PCU frames (GPRS and EDGE). The interface between LSU and the monitoring
client is open, allowing customers to develop their own applications
for special purposes.
Simulation
Test Manager by PRISMA Engineering is a client application able
to run several tests in parallel over all the different data and signalling
links connected to the LSU.
A large number of protocol libraries are available to simulate
every protocol stack at every interface on the GSM/GPRS/EDGE network.
Ready to run solutions based on the Test Manager allow to perform
complete simulation of the behaviour of network elements such
as BSS (more BTS and BSC) or SGSN/GGSN.
Testing people in a telecom lab can:
define scenarios with a lot of BTS and mobile phone calling in
parallel.
programming test scheduling.
trigger actions at particular events or abnormal conditions.
collect statistical data to analyze network behavior in real-time
or by post-processing for QoS verification.
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