Claims
- 1. An improvement to a T1 framer/controller integrated circuit having a receive side framer, a transmit side framer, and an idle code register, the improvement comprising:
- a microcomputer having inputs to said T1 framer/controller integrated circuit;
- said microcomputer having a logic circuit to control said T1 framer/controller, to control multiple lines each having frames and data, and to control framing bit insertion, signal insertion, alarm generation, synchronization of incoming data stream, extract signals, monitor received data for transmission errors, initiate ringing of incoming lines and transmit an off-hook signal when a line is detected to be in an off-hook state; and
- said microcomputer has an input to said idle code register;
- said input to said idle code register having a value which can be updated for each frame;
- said value being a pulse code modulation tone sample ranging from sample sinusoidal to complex multi-frequency.
- 2. The improvement of claim 1, wherein a tone generated from said look-up table is sufficiently less than an 8 kHz sampling rate of the data bank, thereby providing the memory required for said look-up table to be reduced by repeating each value in more than one frame.
- 3. The improvement of claim 1, wherein said microcomputer upon receipt of an appropriate signaling state from the T1 line, said microcomputer initiates an appropriate value from said look-up table.
- 4. The improvement of claim 3, wherein said value from a look-up table is a ring-back tone.
- 5. The improvement of claim 1, wherein said computer upon receipt of an appropriate signaling state from the T1 line, said microcomputer initiates an appropriate value from a calculation.
Parent Case Info
This application is a Division of Ser. No. 08/440,099 now U.S. Pat. No. 5,740,241, filed May 12, 1995; related divisionals issued as U.S. Pat. No. 5,768,368 on Jun. 16, 1998, and U.S. Pat. No. 5,740,241 on Apr. 14, 1998.
US Referenced Citations (14)
Divisions (1)
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Number |
Date |
Country |
Parent |
440099 |
May 1995 |
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