psf21911 ETC-unknow, psf21911 Datasheet - Page 62

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

Semiconductor Group
2.5.6
The state machine includes all information necessary for the user to understand and
predict the activation/deactivation status of the U-transceiver. The information contained
in a state bubble is:
State name, U-signal transmitted, Single Bits (Overhead bits) transmitted, C/I-
indication transmitted on the C/I-channel, Transition criteria and Timers.
Figure 21 State Diagram Notation U-Transceiver
The following example explains the use of the state diagram by an extract of the NT-
state diagram. The state explained is the “EC-Training” state.
Example:
The state may be entered by either of two methods:
–from state “Alerting” after time T11 has expired.
–from state “EC-Training 1” after the C/I command “DI” has been received.
The following informantion is transmitted:
–SN1 is sent on the U-interface.
–No overhead bits are sent
–C/I message “DC” is issued on the IOM-2 interface.
The state is be left at occurrence of one of the following events:
–Leave for state “EQ-Training” after LSEC has been detected.
–Leave for state “EQ-Training” after timer T12 has expired.
State Machine Notation Rules
Signal Transmitted
to U-Interface
Indication Transmitted on C/I-Channel
(general)
State Name
OUT
(DD)
62
IN
to U-Interface
Transmitted
Single Bit
ITD04257
U-Transceiver
PSB 21911
PSF 21911
11.97