psf21911 ETC-unknow, psf21911 Datasheet - Page 34

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

PSB 21911
PSF 21911
IOM®-2 Interface
®
2.3.2
IOM
-2 Command / Indication Channels
The Command/Indication channels carry real-time control and status information over
the IOM-2 interface.
C/I Channel 0
C/I channel 0 (C/I0) is available in both operational modes (NT and TE mode). The
channel consists of four bits in each direction. Activation and deactivation of the U-
transceiver is always controlled via the C/I0 channel. The C/I codes going to the U-
transceiver are called “commands”, those originating from it are referred to as
“indications”. The C/I codes of the U-transceiver are listed and explained in chapter 2.5.8
on page 74.
In stand-alone mode the C/I0 channel is controlled by an external device, e.g. the ICC,
3PAC, IPAC or ISAR.
In µP mode the C/I0 channel can either be controlled by an external device or via the
microprocessor interface. For a description on how to access the C/I0 channel via the
µP-interface please refer to chapter 2.6.3 on page 83.
C/I Channel 1
C/I channel 1 (C/I1) is only available in TE mode (DCL = 1.536 MHz). The channel
consists of six bits in each direction.
In stand-alone mode the C/I1 channel is ignored by the U-transceiver.
In µP mode it can be accessed via registers CIWI/U and CIRI/U (page 83).
Semiconductor Group
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11.97