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): 52/164頁
文件大小: 1401K
代理商: PSF21911
PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
52
11.97
MON-0 Structure
Addr:
Address
– 0 = NT
– 1 … 6 = Repeater
– 7 = Broadcast
d/m:
Data/Message
– 0 = Data
– 1 = Message
i1-i8:
EOC Code
– 00 … FF
H
= coded EOC command/indication
EOC Auto Mode
Acknowledgment:
All received EOC-frames are echoed back to the exchange
immediately without triple-last-look. If an address other than (000
B
) or (111
B
) is received,
a HOLD message with address 000
B
is returned. However, there is an exception: The
IEC-Q TE will send a ’UTC’ after three consecutive receptions of d/m = (0) or after an
undefined command.
Latching:
All detected EOC-commands are latched, i.e. they are valid as long as they
are not disabled with the EOC ’RTN’ command or a deactivation.
Transfer to IOM:
With the triple-last-look criteria fulfilled the new EOC-command will be
passed to IOM-2 with one single MON-0-message, independently of the address used
and the status of the d/m indicator. MON-0-commands from IOM will be ignored.
Execution:
The EOC-commands listed in
table 8
will be executed automatically by the
PSB 21911 if they were addressed correctly (000
B
or 111
B
) and the d/m bit was set to
message (1). The execution of a command is performed only after the “triple-last-look”
criterion is met.
1. Byte
2. Byte
0 0 0 0
MON-0
A A A | X
Addr. | d/m
i1 i2 i3 i4
i5 i6 i7 i8
EOC Code
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