Active test call generator
The test call generator STU (Service Test Unit) is used in active end-to-end (E2E) measuring systems as an active test element for generating test calls or test sessions. The STUs are administrated and controlled using the AMIRA Management Platform. Test calls are sent either vial TDM lines or via IP using SIP or H.323 protocol.
Measuring function of the STU
The STU is an active measuring element and can autonomously perform test calls using an order file that has been loaded by the AMIRA Management System. The STU can also accept and log test calls.
The following functions are available:
- Generating test calls from an order file to other STUs, LMS Loop Probes, IVRs, answer points or fax machines in the telephone network and local storage of the call data of these outgoing calls (Extended Call Detail Record CDR)
- Optional performance of voice or fax quality tests and logging of the results in an extended CDR
- Monitoring of certain call events and spontaneous alarming of these events
- Processing of test calls with different services with or without answer
- Execution of different functions e.g. voice quality measurement, fax quality measurement, RAS-dial-in, loop or BERT measurement in the case of terminated calls.
Communication with the AMIRA Management System
The STU communicates via LAN (Intranet or Internet) with the AMIRA Management system. An optional communication vial POTS / ISDN line or GPRS is possible.
STU TDM
The STU TDM is by default connected with a 4 BRI interface to the telephone network. If required, an extension with more 4 BRI or interface cards is possible. Optionally, also modules with a PRI interface and 4 or 8 POTS lines are available.
STU IP
In the basic configuration, the STU IP is connected via 4 Fast Ethernet interfaces to the communication network. If required, extension with additional interfaces or Gigabit interface is possible.
STU GSM/GPRS
Optionally, the STU can be equipped with up to four mobile GSM/GPRS measuring devices. These GSM adaptors allow active sending and/or terminating of test calls and test sessions via the GSM/GPRS network.
Physical structure
The STU in standard version is installed on a 19” rack PC board and contains a 220 V AC or optionally, a 48 V DC redundant power supply.
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