psf21911 ETC-unknow, psf21911 Datasheet - Page 84

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

Semiconductor Group
C/I-commands to the U-transceiver have to be applied at least for two IOM-2 frames (250
µs) to be considered as valid.
In TE mode (i.e. 1.536 MHz DCL), the ADF2:TE1 bit is used to direct the C/I-channel
access either to IOM-2 channel 0 (ADF2:TE1 = 0, default) or to IOM-2 channel 1 of the
IOM-2 terminal structure (ADF2:TE1 = 1), figure 28 on page 84. This allows to program
terminal devices such as the ARCOFI via the processor interface of the IEC-Q TE. The
C/I code going to IOM-2 is 4 bits long if it is written to IOM-2 channel 0 (ADF2:TE1 = 0).
If written to IOM-2 channel 1 this C/I code is 6 ibts long (ADF2:TE1 = 1). If the ADF2:TE1
bit is 1, the C/I channel on IOM-2 channel 0 is passed transparently from the IOM-2
interface to the IEC-Q TE itself.
Figure 28 C/I Channel Access
2.6.4
Setting SWST:MON to "1" enables the microprocessor to access Monitor-channel
messages at IOM-2 interface and the U-transceiver. Monitor-channel access can be
performed in three different IOM-2 channels (see figure 29, page 85).
C/I access to IOM -2 channel 0
C/I 0 (4 Bit)
CIRI
Monitor Channel Access
CIWI
R
CIRU
C/I
(4 Bit)
CIWU
IEC-Q Core
SWST : CI = 1
ADF2 : TE1 = 0
ITB10295
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C/I access to IOM -2 channel 1
C/I 1 (6 Bit)
CIRI
CIWI
R
Access to IOM-2 Channels
CIRU
CIWU
IEC-Q Core
SWST : CI = 1
ADF2 : TE1 = 1
PSB 21911
PSF 21911
ITB10296
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