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): 89/164頁
文件大?。?/td> 1401K
代理商: PSB21911
PSB 21911
PSF 21911
S/G Bit and BAC Bit in TE Mode
Semiconductor Group
89
11.97
2.7
S/G Bit and BAC Bit in TE Mode
Important
: This chapter applies only in μP mode and if DCL = 1.536 MHz (TE mode).
If DCL = 1.536 MHz the IOM-2 interface consists of three IOM-2 channels. The last octet
of an IOM-2 frame includes the S/G and the BAC bit (chapter 2.3.1.1, page 31). Either
or both bits can be used in various applications including
the D-channel arbitration in a PBX via an ELIC on the linecard
the synchronization of a base station in radio in the local loop (RLL) or wireless PBX
applications
The S/G is always written and never read by the IEC-Q TE. Its value depends on the last
received EOC-command and on the status of the BAC bit.The processing mode for the
S/G bit is selected via bits SWST:BS, SWST:SGL and ADF:CBAC according to
table 18
.
A detailed description of the S/G bit in all modes is provided in
Appendix B
.
Table 18
S/G Processing Mode
SWST:
BS
0
0
ADF:
CBAC
x
0
Description (X is don’t care)
Application
SGL
0
1
S/G bit always "0"
S/G bit always "1"
(default)
S/G and BAC are
handled by other
devices than the
IEC-Q TE
ELIC on linecard,
Interframe fill of
terminals
contains zeroes
(e.g. ’01111110’)
Synchronizaiton
of base station,
e.g. IBMC or
MBMC
0
1
1
S/G bit set to "1" continously with EOC
25
H
received, reset to "0" with EOC 27
H
received
BAC bit controlls S/G-bit, upstream D-
channel not affected
S/G bit set to "1" for 4 IOM-frames with
EOC 25
H
receivced, automatically reset
to "0" after that
1
0
x
1
1
0
S/G bit set to "1" continously with EOC
25
H
receivced, reset to "0" with EOC 27
H
received
S/G bit set to "1" continously with EOC
25
H
receivced, reset to "0" with EOC 27
H
received
BAC bit controlls S/G bit and upstream D-
channel according to
table 19
.
1
1
1
ELIC on linecard,
Interframe fill of
terminals are
’ones’
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