Features
| • | 2 "B'+"D' channel 160 kbps transceiver for LT and NT |
| • | Meets ANSI T1.601 U.S. Standard |
| • | 2B1Q line coding with scrambler/descrambler |
| • | Range exceeds 18 kft of #26 AWG |
| • | >70 dB adaptive echo-cancellation and equalization |
| • | On-chip timing recovery, no precision external components |
| • | Direct connection to small line transformer |
| • | Automatic activation controller |
| • | Selectable digital interface formats:
| | • | TDM with time-slot assigner up to 64 slots, plus MICROWIRE™ control interface |
| • | GCI (General Circuit Interface), or |
| • | IDL (Inter-chip Digital Link) |
| • | Backplane clock DPLL allows free-running XTAL |
| • | Elastic data buffers meet Q.502 wander/jitter for Slave-slave mode on PBX Trunk Cards and DLC |
| • | EOC and spare bits access with automatic validation |
| • | Block error counter |
| • | 6 loopback test modes |
| • | Single +5V supply, 325 mW active power |
| • | 20 mW idle mode with line signal "wake-up" detector |
Description The TP3410 is a complete monolithic transceiver for ISDN Basic Access data transmission at either end of the U interface. Fully compatible with ANSI specification T1.601, it is built on National's advanced double-metal CMOS process, and requires only a single +5V power supply. A total of 160 kbps full-duplex transmission on a single twisted-pair is provided, with user-accessible channels including 2 "B' channels, each at 64 kbps, 1 "D' channel at 16 kbps, and an additional 4 kbps for loop maintenance. 12 kbps of bandwidth is reserved for framing. 2B1Q Line coding is used, in which pairs of binary bits are coded into 1 of 4 quantum levels for transmission at 80k symbols/sec (hence 2 Binary/1 Quaternary). To meet the very demanding specifications for <1 in 10e7 Bit Error Rate even on long loops with crosstalk, the device includes 2 Adaptive Digital Signal Processors, 2 Digital Phase-locked Loops and a controller for automatic activation.
The digital interface on the device can be programmed for compatibility with either of two types of control interface for chip control and access to all spare bits. In one mode a Microwire serial control interface is used together with a 2B+D digital interface which is compatible with the Time-division Multiplexed format of PCM Combo devices and backplanes. This mode allows independent time-slot assignment for the 2 B channels and the D channel.
Alternatively, the GCI (General Circuit Interface) may be selected, in which the 2B+D data is multiplexed together with control, spare bits and loop maintenance data on 4 pins.
Applications
| • | LT, NT-1, NT-2 Trunks, U-TE's, Regenerators etc. |
| • | Digital Loop Carrier |
| • | POTS Pair-Gain Systems |
| • | Easy Interface to:
| | • | Line Card Backplanes |
| • | "S" Interface Device: TP3420A |
| • | Codec/Filter Combos: TP3054/7 and TP3075/6 |
| • | LAPD Processor: MC68302, HPC16400 |
| • | HDLC Controller: TP3451 |
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