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PEB 80900
Part II
’
IEC-T
’
: Operational Description
Data Sheet
140
2001-04-02
Deact. request rec.
The NTC-T AM with IEC-T functionality selected has received
INFO U0 or one of the deactivating maintenance requests, RES
or SSP. If it receives SSP, the NTC-T AM with IEC-T
functionality selected sends a single pulse every 1 ms on the
line, otherwise INFO U0 is sent. The NTC-T AM with IEC-T
functionality selected remains at least 0.5 ms in this state before
accepting DIU to be sure that it is already valid. The user data
(B+B+D) on pin DOUT is clamped to high (except repeater
modes).
The NTC-T AM with IEC-T functionality selected deactivates
Uk0 sending INFO U0; it remains at least 0.5 ms in this state to
make sure that the associate device on IOM
has recognized a
change from a possible DIU state to DA. The user data (B+B+D)
on pin DOUT is clamped to high (except repeater modes).
The transmission of user data is enabled (INFO U4/U5). If in 64
subsequent Uk0 frames the Barker-code is not found at the
expected position, the NTC-T AM with IEC-T functionality
selected gives out RSYD or RSYU on the C/I channel until it has
resynchronized finding the Barker-code on the same position in
4 subsequent frames.
The RDS counter and the adaption of receiver coefficients are
enabled even if RSYD/RSYU is given out.
In the transmit or in the receive data buffer a data over- or
underflow has occurred. This is indicated to the associated layer
2 device, ICC with code FJ for 0.5 ms (4 IOM
frames). The
RDS counter and the adaption of receiver coefficients are
enabled.
The NTC-T AM with IEC-T functionality selected in each NT
mode is awoken by the downstream unit keeping line DU of
IOM
Interface (pin DIN of IEC) low (TIM). When it receives DIU
again in the C/I channel, the NTC-T AM with IEC-T functionality
selected goes back to power-down within at least 0.5 ms. The
user data (B+B+D) on pin DOUT is clamped to high (except
repeater modes).
Deactivating
Data transmission
Frame jump
IOM
awaked