參數(shù)資料
型號: PSF21911
廠商: SIEMENS A G
元件分類: 數(shù)字傳輸電路
英文描述: ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE
中文描述: DATACOM, ISDN ECHO CANCELLER
文件頁數(shù): 30/164頁
文件大?。?/td> 1401K
代理商: PSF21911
PSB 21911
PSF 21911
IOM-2 Interface
Semiconductor Group
30
11.97
2.3
IOM
-2 Interface
The IOM-2 interface is used to interconnect telecommunication ICs. It provides a
symmetrical full-duplex communication link, containing user data, control/programming
and status channels. The structure used follows the 2B + 1D-channel structure of ISDN.
The ISDN user data rate of 144 kbit/s (B1 + B2 + D) is transmitted in both directions over
the interface.
The IOM-2 interface is a generalization and enhancement of the IOM-1 interface.
2.3.1
IOM
-2 Frame Structure
The IOM-2 interface comprises two clock lines for synchronization and two data lines.
Data is carried over Data Upstream (DU) and Data Downstream (DD) signals. The
downstream and upstream direction are always defined with respect to the exchange.
Downstream refers to information flow from the exchange to the subscriber and
upstream vice versa respectively. The IOM-2 Interface Specification describes open
drain data lines with external pull-up resistors. However, if operation is logically point-to-
point, tristate operation is possible as well.
The data is clocked by a Data Clock (DCL) that operates at twice the data rate. Frames
are delimited by an 8-kHz Frame Synchronization Clock (FSC). Incoming data is
sampled on every second falling edge of the DCL clock.
Figure 11 IOM
-2 Clocks and Data Lines
Within one FSC period 32 bit or 96 bit are transmitted, corresponding to DCL
frequencies of 512 kHz or 1.536 MHz.
Two optimized IOM-2 timing modes exist:
– NT mode for NT1 applications
– TE mode for terminal and intelligent NT applications
相關(guān)PDF資料
PDF描述
PSB21911 ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE
PT3104C 15 WATT 24V TO 5V/12V/15V ISOLATED DC-DC CONVERTER
PT3100-24V 15 WATT 24V TO 5V/12V/15V ISOLATED DC-DC CONVERTER
PT3106C 15 WATT 24V TO 5V/12V/15V ISOLATED DC-DC CONVERTER
PT3402 "2.5V 12A
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PSF21911F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ISDN Line Interface
PSF21911N 制造商:未知廠家 制造商全稱:未知廠家 功能描述:?ISDN Echocancellation Circuit for Terminal Applications - 2B1Q Code?
PSF226 制造商:Pentair Technical Products / Hoffman 功能描述:Swing Frame, fits 2200x600mm LtGray, fits 2200x600mm, Steel
P-SF226 制造商:Pentair Technical Products / Hoffman 功能描述:Swing Frame, fits 2200x600mm 制造商:PENTAIR TECNICAL PRODCUTS 功能描述:Swing Frame, fits 2200x600mm
PSF227 制造商:Pentair Technical Products / Hoffman 功能描述:Swing Frame, fits 2200x700mm LtGray, fits 2200x700mm, Steel