
PEB 80900
Part II
’
IEC-T
’
: Functional Description
Data Sheet
110
2001-04-02
of the echocanceller, equalizer and clock phase is immediately suspended until APF
returns to low.
6.7.4.3
Supervision of Power Supply (NT Mode)
For supervision of the power supply, a high on the DISS pin is used to indicate the power
down of the NT. In this case, the power supply may go to a state optimized for low power
consumption in the devices.
6.7.5
Signaling of Measurement Results and Setting the RD Pins via
MONITOR
A set/reset of the pins RD1 and RD2 or readout of the measurement results via the
MONITOR-channel (third octet of each 8 kHz IOM
frame at DIN and DOUT) is possible
in all modes except the repeater modes. Change RD1 arid RD2 or readout can be
performed in both the power-up and power-down state of the NTC-T AM with IEC-T
functionality selected, if the lOM interface is active.
A command contained in the MONITOR channel of DIN gives the address of the
requested measurement value or identification. Each command is executed after
appearing in one single frame (125 μs).
Only that value (8 bit) which has been addressed by the specific command will be output
in the MONITOR channel of DOUT in the frame immediately following the command
frame. In the MONITOR channel, MSB is always sent first and LSB last.
If no relay driver pin is to be set or if no measurement value is requested, the MONITOR
channel (on DIN) must be held in a NOP condition (No OPeration).
Table 17
Coding of MONITOR Commands
NOP
00
H
, F0
H
... F6
H
F8
H
... FF
H
80
H
Inactive, output FF
H
Identification
NTC-T AM with IEC-T functionality selected
responds to 80
H
, distinguishing NTC-T AM with
IEC-T functionality selected from other layer 1
devices
Read and reset RDS counter
Read power feed current
Read coefficients of echo canceller
Set RD1, reset RD2
Reset RD1, set RD2
Set RD1, set RD2
Reset RD1, reset RD2
(output always FF
H
)
RDS
MPF
Coefficients
Relay driver
RD1, RD2
EF
H
EE
H
04
H
... 63
H
74
H
75
H
76
H
77
H