POTS extender for voice fallback in a subscriber line
View Patent ↗A full services access multiplexer is described. A master DSL modem is coupled to a conductor pair. A POTS extender is coupled to the conductor pair and may sense the operation of a fallback or other signal on the conductor pair. A suppression signal may be transmitted to the master DSL modem upon occurrence of the fallback. The suppression signal may travel over a control circuit. Traffic over a backplane or other network segment may be uninterrupted to an Integrated Access Device by handling signals inbound and outbound to the backplane via packet assembler and disassembler (PAD). The PAD may transmit a data stream to vocoder and received a data stream from vocoder for injection onto the backplane. The vocoder connects duplexed traffic to the subscriber line interface circuit (SLIC), wherein traffic between the vocoder and the SLIC are in analog formats in or near the audible range of frequencies.
1. A plain old telephone service (POTS) extender for at least one conductor pair for providing packets to a packet network and receiving packets from the packet network, the POTS extender comprising:
a subscriber line interface circuit (SLIC) having a connection to the at least one conductor pair, said SLIC having an upstream voice signal output and a downstream voice signal input, the SLIC configured to transmit a master Digital Subscriber Line (DSL) modem control signal based on a fallback signal received over the at least one conductor pair;
a codec configured to convert the upstream voice signal output to an upstream digital voice signal output and configured to convert a downstream digital voice signal input to the downstream voice signal input;
a vocoder configured to convert the upstream digital voice signal output to a first data stream and configured to convert a second data stream to the downstream digital voice signal input;
a packet assembler and disassembler (PAD) configured to convert the first data stream into a first at least one packet and configured to convert a second at least one packet into the second data stream, said PAD connected to the packet network and said PAD having a first at least one network address; and
a master DSL modem having a second at least one network address and connected to the at least one conductor pair, the master DSL modem configured to receive the master DSL modem control signal and enter a quiescent state based on the master DSL modem control signal.
2. The POTS extender of claim 1 , wherein the SLIC further comprises:
a loop current detector having a connection to the at least one conductor pair, said loop current detector configured to provide the master DSL modem control signal.
3. The POTS extender of claim 1 , wherein the SLIC further comprises:
a telephony current source; switch hook detector; and a ringing signal source.
4. The POTS extender of claim 1 , wherein the second at least one network address comprises at least one asynchronous transfer mode virtual circuit identifier.
5. The POTS extender of claim 1 , wherein the first at least one network address comprises at least one asynchronous transfer mode virtual circuit identifier.