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TP3420AN308-TP3420AV308-TP3420AV309
ISDN S/T Interface Device
TP3420A
ISDN S/T Interface Device
General DescriptionThe TP3420Aisan enhanced versionofthe TP3420,witha
numberof upgraded featuresfor compliance withthe new
releaseof ANSI T1.605-1991 and CCITT I-430.At initial
power-upthe deviceis fully backwards compatible withthe
TP3420 device,and modificationstothe firmwareare only
requiredto take advantageofthe new features.
The TP3420AS Interface Device (SID™)isa complete
monolithic transceiverfor data transmissionon twistedpair
subscriber loops.Itis builton National’s advanced1.0mi-
cron double-metal CMOS process, and requires onlya
single +5V supply.All functions specifiedin CCITT recom-
mendation I.430 (1991) and ANSI T1.605 (1991)for ISDN
basic accessatthe“S”and“T” interfacesare provided,and
the devicecanbe configuredto operate eitherinaTE (Ter-
minal Equipment),inan NT-1or NT-2 (Network Termination)asa PABX line-cardor trunk-card device. specifiedin I.430, full-duplex transmissionat192 kb/sis
providedon separate transmitand receive twisted wire pairs
using inverted Alternate Mark Inversion (AMI)line coding.2
“B” channels, eachof64 kb/s,and1“D” channelat16 kb/s
are availablefor users’ data.In addition,the TP3420Apro-
videsthe800b/s “S1”, “S2”&“Q” multiframe channelsfor
Layer1 maintenance.
All I.430 wiring configurationsare supportedby theTP3420A
SID, includingthe “passive bus”forupto8 TE’s distributed
within 200 metersof low capacitance cable, and
point-to-point and point-to-star connectionsuptoat least
1500 meters (24AWG). Adaptive receive signal processing
ensureslowbit error ratesonanyofthe standard typesof
cable pairs commonly foundin premise wiring installations
when tested withthe noise sources specifiedin I.430.
Features 2B+D 4-wire192 kb/s transceiver SelectableTEorNT mode Exceeds I.430 range:1.5km point-to-point Adaptive receiverfor high noise immunity Adaptiveand fixed timing optionsfor NT-1 Clock resynchronizerand elastic buffersfor NT-2/LT Slave-slave modefor NT-2 trunks Extensive hardware supportfor SC1, SC2andQ
channel messaging Bipolar violation detectionand FECV messaging Selectable system interface formats MICROWIRE™and SCP compatible serial control
interface TP3054/7 Codec/Filter COMBO™ compatibility Single +5V supply 20-pin package DIP, PLCC
Applications Same DeviceforNT,TEand PBX Line Card Point-to-Point Range Extendedto1.5km Point-to-Multipointforall I.430 Configurations Easy Interfaceto:
LAPD Processor MC68302, HPC16400
Terminal Adapter MC68302, HPC16400
Codec/Filter COMBO TP3054/7and TP3076
“U” Interface Device TP3410
Line Card Backplanes—No External PLL Needed Line Monitor Modefor Test Equipment
TRI-STATE®isa registeredtrademark ofNationalSemiconductorCorporation.
COMBO™,MICROWIRE™andSID™aretrademarksofNationalSemiconductor Corporation.
PRELIMINARYJuly 1994
TP3420A
ISDN
S/T
Interface
Device 1999 National Semiconductor Corporation DS009143
