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參數(shù)資料
| 型號(hào)： | ST70134-ST70135A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | ASCOT ADSL MODEM CHIP SET FOR CPE |
| 中文描述： | 阿斯科特ADSL調(diào)制解調(diào)器芯片組用于CPE |
| 文件頁(yè)數(shù)： | 2/8頁(yè) |
| 文件大?。?/td> | 57K |
| 代理商： | ST70134-ST70135A |
ST70134 - ST70135A
2/8
GENERAL DESCRIPTION
The ADSL modem chip set with ATM interface
provides all the active functions required to build a
complete ATM-based ADSL modem from line
interface to ATM UTOPIA bus. The chip set
employs
Discrete
MultiTone
specified in ANSI T1.413.
The chip set operates at CPE end of the loop
(ATU-R mode).
Reed-Solomon forward error
correction plus Trellis coding with or without
interleaving in internal interleaving RAM provides
maximum noise immunity (see Figure 3).
Interleaving
is
optional
simultaneously on a slow channel (e.g., for dataor
control info) while a fast channel (e.g., video)
operates without interleaving. ICs include rate
adaptation capabilities during show time.
In transmit direction the chip set allows to select
an attenuation of the signal in case of short loops
or large echo (politeness). In receive direction the
chip set can optionally control an external
multiplexer to select an external attenuation of the
signal in case of short loops, and provide a 2-bit
output external gain control.
modulation
as
and
can
be
used
ASCOT chip set
ASCOT is a two-chip ADSL modem transceiver.
STMicroelectronics
provides
software for transceiver’s external controller.
ASCOT can easily be hooked up with ATM
systems through the built-in UTOPIA level 2/1
interface. That allows ATM traffic to be carried at
up to 8Mbit/s downstream and 1Mbit/s upstream,
over a very plain and widespread twisted pair.
ASCOT is intended for use at ATU-R end.
The modem control software can be compiled as
C++ code, independently on the processor used.
the
necessary
The driver can be interfaced to any external real
time operating system.
These pages block diagrams show the main
functions built-in in ST70134 and ST70135A.
ASCOT chip set supports three different rate
adaptation modes: fixed rate adaptation mode,
fixed with capability to boost within fixed range,
dynamic rate adaptation during show time.
Modem’s performances are set by the following
parameters: Rate adaptation mode, Downstream
and Upstream bit rate for both latency paths,
Noise margins (min, max and target typically at
10E-7 BER without RS, interleaving and trellis),
Maximum power spectral density for downstream,
Maximum power for both up and downstream,
Carrier
mask
(which
maximum interleaving delay.
Tones fromnumber 8 to number255 canbe used:
from 8 to 31 for upsteam signals and from 32 to
255 for downstream signals. Numbers 16 and 64
(96 for ADSL over ISDN) are dedicated to pilot
tones which are employed for synchronisation
purposes with ATU-C end. The software sets the
use of tones for optimisation of performances.
Time recovery is carried out by the chip-set
through the pilot tones. This activity is undertaken
in two steps in order to achieve no more than
2ppm with ATU-C.
The transceiver controller software monitors line
and channel. As far as line is concerned noise
margin, attenuation, power, carrier load, relative
capacity occupation are checked.
tones
are
disabled),
Channel’s monitoring deals with cell-delineation,
actual
ATM
(fast
and
downstream rates.
interleaved)
up
and
Figure 1 :
ADSL modem block configuration
DMT MODEM ST70135A
UTOPIA
μ
CONTROL
MEMORY
AFE
ST70134
χ
χ
UTP
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST70135 | ASCOTTM DMT TRANSCEIVER |
| ST70135A | ASCOTTM DMT TRANSCEIVER |
| ST70136 | CPE ADSL ANALOG FRONT END |
| ST70136B | CPE ADSL ANALOG FRONT END |
| ST70136G | CPE ADSL ANALOG FRONT END |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST70134TR | 功能描述:電信線路管理 IC ADSL DMT Transceiver RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| ST70135 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ASCOTTM DMT TRANSCEIVER |
| ST70135A | 制造商:STMicroelectronics 功能描述:Modem Chip Single 144-Pin PQFP |
| ST70136 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CPE ADSL ANALOG FRONT END |
| ST70136B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CPE ADSL ANALOG FRONT END |
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