Tracking Error (Gain Variation With Level) - Nortel Meridian 1 Succession 1000 Manual

Therefore, the overload level in the receive direction is defined as the analog
signal level (at the port interface) with an average power that is 3 dB greater
than that of the signal, which after encoding produces the equivalent of the
digital milliwatt (PBX zero-level point).
The overload level in the transmit direction is defined as the analog signal
level (at the port interface) with an average power that is 3 dB greater than
that of the signal, which after decoding results from the equivalent of the
digital milliwatt. Table 56 shows the overload levels in both the receive and
the transmit directions.
Note: The digital milliwatt is the digital representation of a 1 kHz signal
at 0 dBm.
Table 56
Overload level—µ-Law
Type of circuit
Line
CO trunk
Tie trunk
Tie (4-wire)
Note: For trunks, overload is specified for pads-out mode.

Tracking error (gain variation with level)

Level tracking measures how closely changes in the level of the input signal
cause corresponding changes in output level. Tracking error, as shown in
Table 57, is the deviation, in decibels, in gain or loss through specified ranges
of input level relative to the deviation of a nominal 1000-Hz input signal at
the 0 dBm0 level.
Transmission characteristics—µ-Law
Receive
(analog to digital)
+6.5
+3.0
+3.5
+3.0
Overload level (dBm)
Transmit
(digital to analog)
Transmission Parameters
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+2.5
+6.0
+3.5
+4.0