PEB 2091
PEF 2091
Operational Description
Test
This "Test" mode is entered when the unconditional commands RES, SSP, LTD,
Pin-RES, Pin-SSP or PFOFF are used. It is left when the pins RESQ, TSP and PS1 are
inactive and the C/I-channel code DR is received. The output signals are as follows:
– When the C/I-channel code RES or RES1 is applied or when the pin RESQ is
activated:
SL0 and DEAC
– When the C/I-channel code SSP is applied or when the pin TSP is activated:
single pulses (SP) and DEAC
– When the C/I-channel code LTD is applied:
SL0 and DEAC; furthermore, the pin DISS is activated
– When the pin PS1 is activated:
SL0 and HI
In this state the IEC-Q does not react to the receipt of a wake-up signal TN.
Transparent
This "Transparent" state corresponds to the fully active state in the case of a normal
activation for call control. It may also be entered in the case of a loop-back 2 if the NT
issues ACT = 1 or in case of a single-channel loop-back in the NT. The LT side is
informed that the status "ready for sending" is reached (indication AI). If the NT side
loses transparency (receipt of ACT = 0), the LT side is informed by making use of the
C/I-channel indication EI2, but no state change is performed. If the S/T-interface is
deactivated (SAI = (0) & ACT = (0)), the device is transferred to the S/T deactivated state.
Wait for TN
In "Wait for TN" the IEC-Q waits for a response (tone TN from the NT or tone TL in case
of an analog loop-back) to the transmission of the wake-up signal TL. If no response is
received within T3, the state is left for re-transmission of a wake-up tone TL. This
procedure is repeated until the detection of tone TN or until expiry of timer T1. In this
case the C/I-channel indication EI3 is issued, but no state change is performed.
4.4.3
State Machine in NT Modes
This chapter describes the behavior of the IEC-Q device if operated in either of the
following NT modes:
– NT mode (512 kHz)
– NT-PBX mode (512 – 4096 kHz)
– TE mode (1536 kHz)
– NT-Auto Activation mode (512 kHz)
Figure 73 describes the behavior of the first three modes, and Figure 74 describes the
behavior of the last one.
Semiconductor Group
160
Data Sheet 01.99
INFINEON [ Infineon ]
