TP3420A Datasheet | National Semiconductor

Description The TP3420A is an enhanced version of the TP3420, with a number of upgraded features for pliance with the new release of ANSI T1.605-1991 and CCITT I-430. At initial power-up the device is fully backwards patible with the TP3420 device, and modifications to the firmware are only required to take advantage of the new features . The TP3420A S Interface Device (SID™) is a plete monolithic transceiver for data transmission on twisted pair subscriber loops. It is built on National’s advanced 1.0 micron double-metal CMOS process, and requires only a single +5V supply. All functions specified in CCITT remendation I.430 (1991) and ANSI T1.605 (1991) for ISDN basic access at the “S” and “T” interfaces are provided, and the device can be configured to operate either in a TE (Terminal Equipment), in an NT-1 or NT-2 (Network Termination) or as a PABX line-card or trunk-card device. As specified in I.430, full-duplex transmission at 192 kb/s is provided on separate transmit and receive twisted wire pairs using inverted Alternate Mark Inversion (AMI) line coding. 2 “B” channels, each of 64 kb/s, and 1 “D” channel at 16 kb/s are available for users’ data. In addition, the TP3420A provides the 800 b/s “S1”, “S2” & “Q” multiframe channels for Layer 1 maintenance. All I.430 wiring configurations are supported by the TP3420A SID, including the “passive bus” for up to 8 TE’s distributed within 200 meters of low capacitance cable, and point-to-point and point-to-star connections up to at least 1500 meters (24AWG). Adaptive receive signal processing ensures low bit error rates on any of the standard types of cable pairs monly found in premise wiring installations when tested with the noise sources specified in I.430. Features n n n n n n n n n n n n n n 2 B + D 4-wire 192 kb/s transceiver Selectable TE or NT mode Exceeds I.430 range: 1.5 km point-to-point Adaptive receiver for high noise immunity Adaptive and fixed timing options for NT-1 Clock resynchronizer and elastic...