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參數(shù)資料
| 型號： | T7264 |
| 英文描述： | T7264 U-Interface 2B1Q Transceiver |
| 中文描述： | T7264 U型接口2B1Q收發(fā)器 |
| 文件頁數(shù)： | 1/54頁 |
| 文件大?。?/td> | 876K |
| 代理商： | T7264 |
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T7264 U-Interface 2B1Q Transceiver
Data Sheet
April 1998
Features
I
U-interface 2B1Q transceiver
— Range over 18 kft on 26 AWG
— ISDN basic-rate 2B+D
— Full-duplex, 2-wire operation
— 2B1Q four-level line code
— Conforms to ANSI North American Standard
T1.601-1992
— Supports NT quiet mode and insertion loss test
mode for maintenance
I
K2 interface
— 2B+D data
— 512 kbits/s TDM interface
— Frame and superframe markers
— Embedded operations channel (eoc)
— U-interface M bits and crc results
— Device control and status
I
Other
— Single +5 V (
±
5%) supply
— –40
°
C to +85
°
C
— 44-pin PLCC
I
Power consumption
— Operating 275 mW typical
— Idle mode 30 mW typical
I
Analog front end
— On-chip line driver for 2.5 V pulses
— On-chip balance network
— Sigma-delta A/D converter
— Internal 15.36 MHz crystal oscillator
— Supports 15.36 MHz external clock input
I
Digital signal processor
— Digital timing recovery (pull range
±
250 ppm)
— Echo cancellation (linear and nonlinear)
— Accommodates distortion from bridged taps
— Scrambling/descrambling
— crc calculations
— Selectable LT or NT operation
— Start-up sequencing with timers
— Activation/deactivation support
— Cold start in 3.5 seconds (typical)
— Warm start in 200 ms (typical)
— U-frame formatting and decoding
Description
The Lucent Technologies Microelectronics Group
T7264 U-Interface 2B1Q Transceiver integrated cir-
cuit provides full-duplex, basic-rate (2B+D) integrated
services digital network (ISDN) communications on a
2-wire digital subscriber loop at either the LT or NT
and conforms to the ANSI North American Standard
T1.601-1992. The single +5 V CMOS device is pack-
aged in a 44-pin plastic leaded chip carrier (PLCC).
5-5161
Figure 1. T7264 Simplified Block Diagram
2-WIRE
2B1Q
U-INTERFACE
LINE
DRIVER
A/D
ECHO
CANCELER
BALANCE
NETWORK
–
+
∑
SCRAMBLER
DESCRAM.
SIGNAL
DETECT
K2 BUS
FORMAT,
DECODE
AGC
K2
XTAL OSC.
15.36 MHz
DEC
2B1Q
ENCODER
DFE
DIG. PLL
T7264
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