D-Channel Monitor Module for the StudioSet
In the StudioSet the so-called D-channel information from ISDN is used, for instance for call set-up or termination. The user notices the status of the line by tones or optical indicators. However, in some situations the user requires additional information, such as Calling Line Identification (CLI), Charging Information or other so-called Call Detail Records (CDR). A D-channel Monitor was previously developed by You/Com as a standalone unit. Now this function is available as a module for integration in the StudioSet.
How was it realised?
Instead of re-designing the StudioSet, You/Com chose to re-develop the existing D-channel Monitor "Mini D-MON". A specific module was developed which can be built-in into all existing StudioSets, the D-MoMo. It can be placed in the StudioSet by a skilled technician, without any changes to the existing hardware or software. It is specifically intended for interworking with the You/Com MSSC software (Multi StudioSet Controller). However, it is possible to adapt an existing Network Management System to interwork with the D-MoMo.
How does it work?
The D-MoMo is connected to the ISDN line in parallel to the existing ISDN Interface. Although the information coming from the network side is of the most interest, both directions can be monitored. De D-MoMo firmware analyses the information, selects the required data and stores it in its memory. The D-MoMo is connected to the same serial port as the control processor. The MSSC (or a similar NMS system) continuously polls the serial port. When the D-MoMo is addressed, the stored D-channel information is transmitted so that it can be processed, stored or displayed on the Management PC.
Additional on-air signalling
In addition to the above mentioned information retrieval, the D-MoMo has four relay outputs for signalling purposes. Normally they are used to signal incoming calls as well as on-air status for both ports. The four relays are connected via the RS485 serial NMS port; as a consequence only the RS232 serial port is available for MSSC or Network Management.