What do you mean by AN-RAX? Explain Specifications of AN-RAX.
The product AN-RAX is basically a Subscriber line concentrator, used for remoting. There are three levels of remoting, namely the first, second and third level, from the ‘Local Exchange’ (LE) (Fig.1.1).
- The ‘Remote Switch Unit‘ (RSU) provides the functionality of first level of remoting. All the Subscribers connected to RSU can access each other and also the subscribers, in the ‘National Network’ (NAT-NW), through LE. RSU, in this case, will perform the functionality of a complete switch (with both intra exchange and up to NAT-NW Switching). It will handle the ‘Call Processing’ (CP), charging and billing functionality, but would itself be a part of the LE.
RSU can also provide concentration.
- The ‘C-DOT Access Network – RAX ’ (AN-RAX) will provide the second level of remoting. AN-RAX might be connected to an RSU or directly to the LE. The AN-RAX supports V5.2 protocol and handles the functionality of the second level of remoting.
The second level of remoting has its scope and role clearly defined. At this level, there would neither be any intra switching or call processing activities, nor the AN-RAX would handle the charging, billing and administration functions of subscribers.
AN-RAX provides a transparent link between the subscriber and LE. It handles the various subscriber events, the BORSCHT functionalities. (Battery feed, Overvoltage protection, Ringing, Supervision, Coding, Hybrid, and Testing).
- All the administration, call processing, charging, billing, traffic monitoring, and switching are performed at LE, where AN-RAX plays the role of front end termination at the remote end.
- The main feature of AN-RAX is that it provides concentration, through V 5.2 protocol, which is used as a signaling protocol between LE and AN-RAX.
- 248 PSTN subscribers can be supported on two E1 links towards LE, thus providing an approximate concentration of 4:1. This places the AN-RAX at a level higher than a simple MUX, which is used at the third level of remoting. The system can work on one E1 link towards LE, but without ‘PROTECTION’, resulting in an increase in concentration to 8:1 (Fig. 1.2).
- Third Level of remoting handles the front end functions (subscriber events), but does not provide any concentration. The various subscriber ports of MUX have nailed up (fixed) slots in the link towards LE. The MUX may be connected directly to LE or to a unit of a higher level of remoting.
A maximum number of 60 bearer channels (2E1 Links) are supported by AN-RAX. A maximum of 248 PSTN subscribers can be supported.
- INTERFACE TOWARDS LOCAL EXCHANGE
The system has a provision of two 2 Mbps digital trunks (E1 Links) for V5.2 link towards Local exchange.
- INTERFACE TOWARDS SUBSCRIBERS
LCC Cards provide 2W analog line interface for the subscriber. It supports Caller Identification on 2 ports of each card. CCM Cards provide a 2W analog line interface for the subscriber. It supports Caller Identification Reversal and 16KHz metering pulses on the 7th and 8th ports.
Signaling INTERFACE TO THE EXCHANGE
2 signalling interface, uses TS16 of E1 links for signalling, related to the PSTN subscribers. This approach makes it possible to connect the AN-RAX unit to any exchange that supports V5.2 protocol.
Each card health status is displayed at an alarm window on VDU Panel. Separate health status for each E1 Link is displayed at an alarm window on VDU Panel.
- POWERING OPTION
Power is derived from nominal -48V DC.
Periodical and manual self test of the AN-RAX unit is done. Test card is used to test the health of the analog subscriber line cards & lines (including telephone instrument).