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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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