Alarm and test system for a digital added main line

A method of testing a digital added main line, said digital added main line comprising a line card for conversion of multiple analog signals at a local exchange to digital signals for transmission over a single twisted pair to a subscriber location, and a remote terminal for conversion of said digital signals to analog signals for use by subscriber equipment, said method comprising the steps of:

• a) emulating an analog signal at an input to said line card;
• b) converting said emulated analog signal to a digital signal for transmission over said twisted pair to said remote terminal;
• c) converting said digital signal at said remote terminal to an analog signal and retransmitting a reflected signal to said line card;
• and
• d) comparing said reflected signal to a reference standard, a deviation from said standard indicating a failure in at least one of said line card, said remote terminal, and said twisted pair.

A method of testing a digital added main line, said digital added main line comprising a line card for conversion of multiple analog signals at a local exchange to digital signals for transmission over a single twisted pair to a subscriber location, and a remote terminal for conversion of said digital signals to analog signals for use by subscriber equipment, said method comprising the steps of:

• a) performing a channel test of said digital added main line, said channel test testing all of said line card, said remote terminal, and said twisted pair;
• b) performing a test of said line card using emulated remote terminal output;
• c) performing a test of said twisted pair;
• and
• d) performing a test of said remote terminal using emulated line card output.

A method of testing a digital added main line, said digital added main line comprising a line card for conversion of multiple analog signals at a local exchange to digital signals for transmission over a single twisted pair to a subscriber location, and a remote terminal for conversion of said digital signals to analog signals for use by subscriber equipment, said method comprising the steps of:

• a) performing a channel test of said digital added main line, said channel test testing all of said line card, said remote terminal, and said twisted pair, said channel test comprising the steps of:
• i) connecting a reflective load to an output of said remote terminal;
• ii) emulating an analog signal to an input of said line card;
• and
• iii) comparing a reflected signal at said line card to a reference value;
• b) performing a test of said line card using emulated remote terminal signals, said test of said line card comprising the steps of:
• i) connecting a remote terminal emulator to an output of said line card;
• ii) connecting a remote terminal emulator to an output of said remote terminal emulator;
• iii) emulating an analog signal to an input of said line card;
• iv) comparing a reflected signal at said line card to a reference value;
• c) performing a test of said twisted pair, said test of a twisted pair comprising the steps of:
• i) applying a first voltage to a first wire of said twisted pair;
• ii) measuring a current to said first wire;
• iii) applying said first voltage to said first wire with a second wire grounded;
• and
• iv) measuring a current to said first wire;
• d) performing a test of said remote terminal using emulated line card output, said test of said remote terminal comprising the steps of:
• i) emulating output of a line card to an input of said remote terminal;
• and
• ii) comparing a reflected voltage from said remote terminal to a reference standard.

An enclosure for telecommunications equipment comprising:

• a) a frame, said frame defining a limited access region and an accessible region, said limited access region comprising limited access telephone line connections, said accessible region comprising accessible telephone line connections;
• b) a first cover over said limited access region, said cover permitting access to said limited access region upon release of an access restrictive fastener;
• c) a second cover over said accessible region, said second cover permitting access to said accessible region upon release of a second fastener;
• and
• d) a components case, said component case enclosing at least one electronics component for processing signals from and to said limited access telephone line connections and said accessible telephone line connections, said component attached to said accessible telephone line connections and said limited access telephone line connections with a socket and plug assembly.

An environmental enclosure for protection of electronic equipment used for analog to digital telephonic signals at a subscriber location, comprising:

• a) a frame, said frame partially enclosing a telephone company twisted pair block and a user terminal block for connection of subscriber equipment;
• b) a first hinged door for enclosing said twisted pair block, said hinged door securable to said frame with a fastener, said fastener limiting access of a subscriber to said twisted pair block;
• c) a second hinged door for enclosing said block for connection of subscriber equipment, said first and said second hinged doors rotatable about an axis and slidable along said axis from a first position to a second position;
• d) an electronics board case, said electronics board case electrically connectable to said block for connection of subscriber equipment and said twisted pair block with a socket and plug assembly on top of said frame, said electronics board case secured to said frame mechanically with at least one fastener accessible from a region enclosed by said first hinged door.

A service module for alternately connecting subscriber tip and ring lines and service means comprising:

• a) an RJ11 socket;
• b) a first electrical conductor connecting a first terminal of said female RJ11 to a tip line in a subscriber location;
• c) a second electrical conductor connecting a second terminal of said female RJ11 to a ring line in a subscriber location;
• d) a third electrical conductor connecting a third terminal of said female RJ11 to a means for providing tip signals from a telephone switch;
• e) a forth electrical conductor connecting a fourth terminal of said female RJ11 to a means for providing ring signals from a telephone switch;
• and
• f) an RJ11 plug insertable in said female RJ11 socket, said RJ11 plug comprising:
• i) a first shunt conductor for connecting said first electrical conductor and said third electrical conductor;
• and
• ii) a second shunt conductor for connecting said second electrical conductor and said fourth electrical conductor when said RJ11 plug is inserted in said RJ11 socket.