DASL Digital Adapter for Subscriber Loops
TP3406 DASL Digital Adapter for Subscriber Loops
November 1992
TP3406 DASL Digital Adapter for Subscriber Loops
Genera...
Description
TP3406 DASL Digital Adapter for Subscriber Loops
November 1992
TP3406 DASL Digital Adapter for Subscriber Loops
General Description
The TP3406 is a complete monolithic transceiver for data transmission on twisted pair subscriber loops It is built on National’s double poly microCMOS process and requires only a single a 5 Volt supply Alternate Mark Inversion (AMI) line coding in which binary ‘1’s are alternately transmitted as a positive pulse then a negative pulse is used to ensure low error rates in the presence of noise with lower emi radiation than other codes such as Bi-phase (Manchester) Full-duplex transmission at 144 kb s is achieved on a single twisted wire pair using a burst-mode technique (Time Compression Multiplexed) Thus the device operates as an ISDN ‘U’ Interface for short loop applications typically in a PBX environment providing transmission for 2 B channels and 1 D channel On 24 cable the range is up to 800 meters System timing is based on a Master Slave configuration with the line card end being the Master which controls loop timing and synchronisation All timing sequences necessary for loop activation and de-activation are generated on-chip Selection of Master and Slave mode operation is programmed via the Microwire Control Interface A 2 048 MHz clock which may be synchronized to the system clock controls all transmission-related timing functions
Features
Complete ISDN PBX 2-Wire Data Transceiver including Y 2 B plus D channel interface for PBX U Interfa...
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