參數(shù)資料
型號: PSB21911
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): 33/164頁
文件大?。?/td> 1401K
代理商: PSB21911
PSB 21911
PSF 21911
IOM-2 Interface
Semiconductor Group
33
11.97
C/I2 in IOM
-2 Channel 2:
E:
D-echo bits
BAC-bit
(Bus ACcessed). When the TIC bus is occupied the BAC-bit is low.
S/G-bit
(Stop/Go), available to a connected HDLC controller to determine if
it can access the D-channel (S/G = 1: stop, S/G = 0: go).
A/B-bit
(available/blocked), supplementary bit for D-channel control.
(A/B = 1: D-channel available, A/B = 0: D-channel blocked).
TBA0-2:
TIC Bus Address
2.3.1.2
In NT mode the IEC-Q TE provides a data clock DCL with a frequency of 512 kHz. As a
consequence the IOM-2 interface provides only one channel with a nominal data rate of
256 kbit/s.
Channel 0 contains 144 kbit/s (for 2B+D) plus Monitor and Command/Indication
channels.
NT Mode Structure
The IOM-2 signals are:
DIN, DOUT
DCL
FSC
256 kbit/s
512 kHz output
8 kHz output
Figure 14 Definition of the IOM
-2 Frame in NT Mode
DU
DD
1
E
1
E
BAC
S/G
TBA2
A/B
TBA1
1
TBA0
1
1
1
1
1
ITD09788
B1
B2
MONITOR
D
M
R X
M
C/I
B1
B2
MONITOR
D
C/I
R
M
X
M
IOM Channel 0
R
μs
125
FSC
DD
DU
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