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

Page 156 of 236

Tracking error (gain variation with level)

553-3001-182 Standard 1.00
Transmission characteristics—A-Law
decoding results from the equivalent of the digital milliwatt. Table 41 shows
the overload levels in both the receive and the transmit directions.
Table 41
Overload level—A-Law
Type of circuit
Line
CO trunk
Tie trunk
Tie (4-wire)
Note: For trunks, overload is specified for pads-out mode.
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 42, is the deviation, in decibels, in gain or loss through specified ranges
of input level relative to the deviation of a nominal 820-Hz input signal at the
0 dBm0 level.
Table 42
Tracking error (gain variation with level)—A-Law
820-Hz signal input (dBm0)
–55 to –10
–10 to +3
October 2003
Overload level (dBm)
Receive
(analog to digital)
+6.5
+3.0
+3.5
+3.0
Variation in insertion loss (dB)
Transmit
(digital to analog)
+2.5
+6.0
+3.5
+4.0
+0.5
+0.5