psf21911 ETC-unknow, psf21911 Datasheet - Page 37

• Manufacturer Part Number: psf21911
• Description: Isdn Echocancellation Circuit Terminal Applications Iec-q
• Manufacturer: ETC-unknow

2.3.4
The IOM-2 clocks may be switched off if the U-transceiver is in state ’Deactivated’. This
reduces power consumption to a minimum. In this deactivated state the clock lines are
low and the data lines are high. The power-down condition within the ’Deactivated’ state
will only be entered if no Monitor messages are pending on IOM-2.
For information on how to keep the IOM-2 clocks active in all states please refer to the
application note ’Providing Clocks in Deactivated State’ of 09.97.
The deactivation procedure is shown in figure 15. After detecting the code DI
(Deactivation Indication) the U-transceiver responds by transmitting DC (Deactivation
Confirmation) during subsequent frames and stops the timing signals after the fourth
frame.
Figure 15 Deactivation of the IOM
The IOM-2 clocks are activated automatically when the DIN line is pulled low or a line
activation is detected on the U-interface. If a PSB 2186 (ISAC-S TE) or PEB 2070 (ICC)
is connected to the IEC-Q TE via IOM-2, the DIN line of the IEC-Q TE is pulled low by
Semiconductor Group
a)
FSC
DIN
DOUT
b)
DCL
DIN
Activation/Deactivation of IOM
DR
DI
D
DR
DI
C /
®
DC
DI
-2 Clocks
/ C
37
®
-2 Clocks
DC
DI
/ C
DC
DI
/ C
Detail see Fig.b
DC
DI
ITD10292
IOM®-2 Interface
IOM -2 Interface
deactivated
IOM -2 Interface
deactivated
R
R
PSB 21911
PSF 21911
11.97