TP3406 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 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 a5 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 radia-
tion 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 Com-
pression 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 pro-
grammed via the Microwire Control Interface
A 2 048 MHz clock which may be synchronized to the sys-
tem clock controls all transmission-related timing functions
Block Diagram
Features
Complete ISDN PBX 2-Wire Data Transceiver including
Y _{2 B plus D channel interface for PBX U Interface}
Y _{144 kb s full-duplex on 1 twisted pair using Burst Mode}
Y _{Loop range up to 800 meters ( 24AWG)}
Y _{Alternate Mark Inversion coding with transmit filter and}
scrambler for low emi radiation
Y _{Adaptive line equalizer}
Y _{On-chip timing recovery no external components}
Y _{Standard TDM interface for B channels}
Y _{Separate interface for D channel}
Y _{2 048 MHz master clock}
Y _{Driver for line transformer}
Y _{4 loop-back test modes}
Y _Single a_{5V supply}
Y _MICROWIRETM _{compatible serial control interface}
Y _{Applications in}
PBX Line Cards
Terminals
Regenerators
Y _{Available in 28-pin PLCC Package}
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRETM is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 11725
TL H 11725 – 1
RRD-B30M115 Printed in U S A