Mitel 3300 - Recommendations for North American LS Trunks; Recommendations for UK LS Trunks

Hardware Technical Reference Manual
52
For non-loaded loops, Bell (NA) recommends the following wire gauges:
Recommendations for North American LS Trunks
The information in the following table is based on North American transmission specifications
and is provided for North American installations. Other regions or countries will have similar
specifications; refer to region- or country-specific specifications when installing product in
regions other than North America.
For best performance, analog trunks should meet or exceed the “acceptable” values in the
following table. If an analog trunk fails to meet the “acceptable” values the issue should be
addressed with the service provider.
The values specified for Circuit Noise, Power Influence and 3 kHz Flat Circuit Noise assume
a transmission level of 0 dB. For interface transmission levels other than 0 dB, the specified
values should be shifted by a value that corresponds to the difference between the transmission
level at that interface and 0 dB.
Table 23: Recommennded Transmission Specifications for North American LS Trunks
Recommendations for UK LS Trunks
This following information is only relevant for installations in the UK:
• When connecting the 3300 ICP to Local Exchange lines via LS trunks it is important that
the correct line type be used.
Table 22: Recommended Trunk Lengths by Wire Size
Wire Size Length Limit
26 AWG 15000 ft (~5 km) ~0.53 dB/1000 ft (~1.6 dB/km)
24 AWG
18000 ft (~5.8 km)
22 AWG
19 AWG
Note:26 AWG = 0.4mm
22 AWG = 0.6mm
Table 24:
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.