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參數資料
| 型號： | I90135 |
| 廠商： | Integrated telecom express,Inc. |
| 英文描述： | ADSL Digital Chip |
| 中文描述： | 寬帶數字芯片 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 89K |
| 代理商： | I90135 |
Integrated Telecom Express, Inc.
1
I90135
Product Data Sheet
Version 1.2 (June 1999)
I90135-ADSL Digital Chip
Features
!
ANSI T1.413 Issue 2 standard DMT
modem with embedded, bypassable,
ATM framer
!
Byte interface or standard Utopia level 1
and level 2 ATM interfaces
!
Main functions include:
Receive Direction:
-
Rotor and adaptive frequency domain
equalizing
-
Demapping of DMT carriers into a
digital bitstream, including 4D trellis
coding
-
Error and noise monitoring on
individual carriers and pilot tones
-
Reed-Solomon decoding and
deinterleaving
-
ADSL deframing
-
ATM cell-specific deframing (can be
bypassed)
-
144-pin PQFP package
-
Power consumption 1 watt at 3.3V
Transmit Direction:
-
ATM cell-specific framing
-
ADSL framing
-
Reed-Solomon encoding
-
Mapping of digital bitstream onto DMT
carriers
-
Rotor and frequency domain gain
correction
General Description
ITeX's I90135 is the DMT modem and ATM
Framer of the Apollo series rate adaptive
ADSL chipset. The I90135 is intended to be
used in combination with I80134 analog
front end. In addition, the control function
of the chipset can be performed on a
dedicated external controller (see figure
1.1) or on host/control software eliminating
the need for a microcontroller (see figure
1.2).
The I90135 may be used in both ATU-C
(central office) and ATU-R (remote)
applications. The chip provides both a cell-
based UTOPIA level 1 and 2 ATM data
interface to the host and a non-ATM
synchronous bit stream.
The I90135 performs the DMT modulation,
demodulation, Reed-Solomon encoding, bit
interleaving, and 4D trellis coding.
The I90135 is in a 144-pin PQFP package.
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