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): 50/164頁
文件大?。?/td> 1401K
代理商: PSF21911
PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
50
11.97
2.5.1.4
Embedded Operations Channel (EOC)
EOC-data is inserted into the U-frame at the positions M1, M2 and M3 thereby permitting
the transmission of two complete EOC-messages (2
×
12 bits) within one U-superframe.
The EOC contains an address field, a data/message indicator (d/m) and an eight-bit
information field.
With the
address field
the destination of the transmitted message/data is defined.
Addresses are defined for the NT, 6 repeater stations and broadcasting.
The
data/message indicator
needs to be set to (1) to indicate that the information field
contains a message. If set to (0), numerical data is transferred to the NT. Currently no
numerical data transfer to or from the NT is required.
From the 256 codes possible in the
information field
64 are reserved for non-standard
applications, 64 are reserved for internal network use and eight are defined by ANSI/
ETSI for diagnostic and loop-back functions. All remaining 120 free codes are available
for future standardization.
Table 7
EOC-Codes
EOC
d/m
Address
Information
(hex)
Direction
Message
Function
a1 a2 a3
d/m
i1 - i8
0
0
0
x
NT
Broadcast
Repeater
stations
No. 1 – No. 6
Data
Message
1
1
1
x
0
1
0
1
1
0
x
0
1
1
50
NT <---- LT
LBBD
LB1
LB2
RCC
NCC
RTN
H
Close complete Loop
Close Loop B1
Close Loop B2
Request Corrupt CRC
Notify of corrupt CRC
Return to normal
Hold
1
51
NT <---- LT
1
52
NT <---- LT
1
53
NT <---- LT
1
54
NT <---- LT
1
FF
NT <---- LT
1
00
NT <---> LT
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