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): 104/164頁
文件大小: 1401K
代理商: PSB21911
PSB 21911
PSF 21911
Layer 1 Activation/Deactivation
Semiconductor Group
104
11.97
Partial Activation (U Only)
The IEC-Q TE is in the “Synchronized 1” state (see state machine) after a successful
partial activation. IOM-2-clocks DCL and FSC are issued. On DOUT the C/I-message
“DC” as well as the LT-user data is sent.
While the C/I-messages “DI” (1111
B
) or “TIM” (0000
B
) are received on DIN, the
IEC-Q TE will transmit “SAI” = (0) upstream. Any other code results in “SAI” = (1) to be
sent. On the U-interface the signal SN3 (i.e. 2B + D = (1)) will be transmitted continuously
regardless of the data on DIN.
The LT will transmit all user data transparently downstream (signal SL3T). In case the
last C/I-command applied to DIN was “UAR”, the LT retains activation control when an
activation request comes from the terminal (confirmation with C/I = “AR” required,
see
page 106 (case 1
). With C/I “DC” applied on DIN, TE initiated activations will be
completed without the necessity of an exchange confirmation (
page 107 (case 2)
).
Figure 38 U Only Activation
ITD10205
DC
DI
DC
DI
UAR
SL3T
PU
DC
UAI
(DC)
U-Reference Point
SBCX
IEC-Q TE
IEC-Q
NT
LT
S/T
ARM
act=0 dea=1 uoa=1
0
0
INFO
INFO
AR
SL0
SN0
TL
TN
SN1
SN0
SL1
0
SN2
=
act
0
=
uoa
1
=
dea
=
act
SL2
0
sai
0
SN3
=
R
EPIC
R
IOM -2
R
IOM -2
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