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TP3420AJ Datasheet

  • TP3420AJ

  • ISDN S/T Interface Device

  • 32頁

  • NSC

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TP3420A ISDN S/T Interface Device
PRELIMINARY
July 1994
TP3420A
ISDN S/T Interface Device
General Description
The TP3420A is an enhanced version of the TP3420, with a
number of upgraded features for compliance with the new
release of ANSI T1.605-1991 and CCITT I-430. At initial
power-up the device is fully backwards compatible with the
TP3420 device, and modifications to the firmware are only
required to take advantage of the new features.
The TP3420A S Interface Device (SID
鈩?/div>
) is a complete
monolithic transceiver for data transmission on twisted pair
subscriber loops. It is built on National鈥檚 advanced 1.0 mi-
cron double-metal CMOS process, and requires only a
single +5V supply. All functions specified in CCITT recom-
mendation I.430 (1991) and ANSI T1.605 (1991) for ISDN
basic access at the 鈥淪鈥?and 鈥淭鈥?interfaces are provided, and
the device can be configured to operate either in a TE (Ter-
minal Equipment), in an NT-1 or NT-2 (Network Termination)
or as a PABX line-card or trunk-card device.
As specified in I.430, full-duplex transmission at 192 kb/s is
provided on separate transmit and receive twisted wire pairs
using inverted Alternate Mark Inversion (AMI) line coding. 2
鈥淏鈥?channels, each of 64 kb/s, and 1 鈥淒鈥?channel at 16 kb/s
are available for users鈥?data. In addition, the TP3420A pro-
vides the 800 b/s 鈥淪1鈥? 鈥淪2鈥?& 鈥淨鈥?multiframe channels for
Layer 1 maintenance.
All I.430 wiring configurations are supported by the TP3420A
SID, including the 鈥減assive bus鈥?for up to 8 TE鈥檚 distributed
within 200 meters of low capacitance cable, and
point-to-point and point-to-star connections up to at least
1500 meters (24AWG). Adaptive receive signal processing
ensures low bit error rates on any of the standard types of
cable pairs commonly found in premise wiring installations
when tested with the noise sources specified in I.430.
Features
n
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2 B + D 4-wire 192 kb/s transceiver
Selectable TE or NT mode
Exceeds I.430 range: 1.5 km point-to-point
Adaptive receiver for high noise immunity
Adaptive and fixed timing options for NT-1
Clock resynchronizer and elastic buffers for NT-2/LT
Slave-slave mode for NT-2 trunks
Extensive hardware support for SC1, SC2 and Q
channel messaging
Bipolar violation detection and FECV messaging
Selectable system interface formats
MICROWIRE
鈩?/div>
and SCP compatible serial control
interface
TP3054/7 Codec/Filter COMBO
鈩?/div>
compatibility
Single +5V supply
20-pin package DIP, PLCC
Applications
Same Device for NT, TE and PBX Line Card
Point-to-Point Range Extended to 1.5 km
Point-to-Multipoint for all I.430 Configurations
Easy Interface to:
LAPD Processor MC68302, HPC16400
Terminal Adapter MC68302, HPC16400
Codec/Filter COMBO TP3054/7 and TP3076
鈥淯鈥?Interface Device TP3410
Line Card Backplanes 鈥?No External PLL Needed
n
Line Monitor Mode for Test Equipment
n
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TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
COMBO
鈩?/div>
, MICROWIRE
鈩?/div>
and SID
鈩?/div>
are trademarks of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS009143
www.national.com

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