BtT9170
Intelligent T1 Controller
Product Description
Distinguishing Features
The BtT9170 Intelligent T1 Controller is a microprocessor (MPU) controlled
device which implements a T1 interface between the multiplexed digital DS1 signal and the PCM highway of digital voice and data system equipment. The
BtT9170 handles both D4 (SF) and D5 (ESF) standards with Facility Data Link
(FDL) used in T1, ISDN primary-rate, and digital carrier systems.
Designers are provided a cost-effective solution for T1/ISDN primary-rate
interface that integrates complex functions to minimize system development time,
component count, board space, and cost. Combining dedicated control pins with
MPU-addressable registers, maximum functional control is achieved with minimal MPU intervention. The BtT9170 provides direct control over the Bt8069series line interface unit (LIU).
Use of a memory-mapped microprocessor bus interface minimizes the host
MPU real-time requirement. Direct MPU access to T1 control and monitor functions in the BtT9170 register map allows software access without complicated
serial message protocols.
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BtT9170 Functional System Interface
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TX
Bt8069
Series
Line
Interface
Unit (LIU)
2 RX
Control
2
5 Status
2
FDLC RX
BtT9170
Intelligent
T1
Controller
80X88
MicroProcessor
Bus
FDLC TX
T1 RSER
T1 TSER
Facility
Data
Link
Control
T1
Data Bit
Stream
Processor
& System
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ADDRESS/DATA BUS
CONTROL BUS
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Brooktree
®
Intelligent Single-Device DS1 T-Carrier
Transceiver (1.544 MHz)
Compatible with ANSI Standard
T1.403 Covering Facility Data Link
Operations:
– Priority Codeword Handling
– Near-End and Far-End Performance Monitoring
– Extracted Link Data Handling
Signalling Register Bank
Independent Transmit and Receive
Per-Channel Conditioning
– Automatic Conditioning of Receive
Trunk and Signalling During CGA
– Unconditional Replacement of
Transmit or Receive Trunk and Signalling
Dedicated per-channel control register
for each time slot
80x88-Compatible Parallel Microprocessor Bus Interface
– 8-Bit Address/Data Bus for Accessing Control and Status Information
Separate Serial Interfaces for DS1
Transmit & Receive Data
Microprocessor-Accessible Registers
– 16 Control and Monitor
– 14 Facility Data Link
– 24 Per-Channel Control
– 12 Received Signalling
User-Maskable Interrupt Request
Generated on Specified Alarm and
Error Conditions
Independent Transmit and Receive
Functions, Each With a Separate
Timebase
Off-line Framer Flywheel Timebase
Option
Implements T1 Formats With and
Without Signalling
– ESF: 24 Frames/Multiframe
– SF: 12 Frames/Multiframe
– N: 4 Frames/Multiframe
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Brooktree Corporation • 9868 Scranton Road • San Diego, CA 92121-3707 • 619-452-7580
1-800-2-BT-APPS • FAX: 619-452-1249 • Internet: apps@brooktree.com • LT917001 Rev. B
