
PEB 80900
Part II
’
IEC-T
’
: Operational Description
Data Sheet
128
2001-04-02
7.3.3
IOM
Control Information to the
NTC-T AM with IEC-T Functionality
Selected
for Test and Maintenance
7.3.4
lOM Control Information from the
NTC-T AM with IEC-T
Functionality Selected
for Power Control
LTD
0 0 1 1
Line Termination Disable. In the LT, the NTC-T AM with IEC-T
functionality selected stops transmitting signals (INFO Up), ignoring
awake signals. The chip is set to power-down. Additionally, the
control output pin DISS is set to high. This command is used in order
to switch off the power-feeding circuitry of the subscriber line and to
keep the Uk0 interface deactivated (e.g. due to a continuous fault).
Reset of the NTC-T AM with IEC-T functionality selected. Any stored
settings are erased. The NTC-T AM with IEC-T functionality selected
goes to the power-up state, but no line signal will be sent out. An
applied low on RESQ pin, while TSP is low, has the same effect (with
one exception regarding pin DISS).
Send Single Pulses. The NTC-T AM with IEC-T functionality selected
goes to the power-up state and sends single pulses with a period of
1 ms. An applied high on the TSP pin, while RESQ is high, has the
same effect.
Test mode of the NTC-T AM with IEC-T functionality selected. The
NTC-T AM with IEC-T functionality selected goes from any mode and
at any state of activation to the transparent state (sends INFO U4/
U5). An applied low on RESQ pin, while TSP is high, has the same
effect.
RES
1 1 0 1
SSP
0 1 0 1
TEST
0 1 1 0
HI
0 0 1 1
High Impedance. When the control line CLS in the LT is set to high,
the indication HI is output in the C/I channel as long as CLS remains
high. The NTC-T AM with IEC-T functionality selected deactivates the
transmission line and any received awake signal is ignored. The
transmitter, however, may be controlled to transmit single pulses
using the command SSP.