Mitel 3300 - Page 98

Hardware Technical Reference Manual
90
values should be shifted by a value that corresponds to the difference between the transmission
level at that interface and 0 dB.
Table 65: Transmission Quality
The following tables provide the impedance values for each Balance Network Setting option
(CO Trunk Circuit Descriptor form) depending on the country variant of the system.
Transmission
Quality
Circuit
Noise
(dBrnc)
2 kHz Flat
Circuit
Noise
(dBrn3kHz)
Power
Influence
(dBrnC)
Circuit
Balance
(dB)
Circuit
Loss (dB)
Loop
Current
(mA)
Acceptable
‹=20 ‹=40 ‹=80 ›=60 ›=6 ›=23
Marginal 20-23 40-60 80-90 50-60 6-8 18-23
Unacceptable
›25 ›60 ›90
‹50
‹8 ‹18
dBrnC: Decibels above Reference Noise with C-message weighting.
dBrn3KHz: Decibels above Reference Noise with 3 KHz flat noise weighting.
Note: The ASU and Universal ASU are not supported in China.
Table 66: Australia
Balance Network Setting
(CO Trunk Circuit Descriptor
Form)
LS Impedance Values
AC Balance
600 270R+(750R||150nF) 270R+(750R||150nF)
National Complex 270R+(750R||150nF) 270R+(750R||150nF)
TBR21 Same as “National Complex” Same as “National Complex”
Alternate Complex Same as “National Complex” Same as “National Complex”
Table 67: Europe
Balance Network Setting
(CO Trunk Circuit Descriptor
Form)
LS Impedance Values
AC Balance
600 270R+(750R||150nF) 270R+(750R||150nF)
National Complex 270R+(750R||150nF) 270R+(750R||150nF)
TBR21 Same as “National Complex” Same as “National Complex”
Alternate Complex Same as “National Complex” Same as “National Complex”
Note: EU countries: France, Germany, Italy, the Netherlands, Portugal, and Spain.
Table 68: New Zealand
Balance Network Setting
(CO Trunk Circuit Descriptor
Form)
LS Impedance Values
AC Balance
600 370R+(620R||310nF) 370R+(620R||310nF)