Mitel 3300 - LS Trunks Selection in the UK; LS Trunks, Acceptable Noise Levels

Services Units and Gateways
89
For non-loaded loops, Bell (NA) recommends the following wire gauges:
LS Trunks Selection in the UK
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.
• The installer or system administrator should request that the Telco (e.g. BT), or carrier,
provide trunks that are compatible to System X line type ‘0’ (Subscriber lines) or line type
‘3’ (business PBX/PABX lines).
Both types of lines will work satisfactorily with the 3300 ICP, however line type ‘3’ is the preferred
line type for connecting a PBX/PABX.
LS Trunks, Acceptable Noise Levels
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 which should be referred to 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
Long (additional signal loss will occur with lines of this
length; some connections will be difficult to use)
Greater than -8 dB
Not acceptable
Note: Use the LSMeasure Tool to determine the line settings for Loop Start (LS) trunks that are
connected to an Analog Board in the controller, a Universal ASU, or an ASU II. Refer to the 3300 ICP
Technician’s Handbook or the System Administration Tool online help for details.
Table 64: Recommended Trunk Lengths by Wire Size
Wire Size Length Limit
26 AWG 15,000 ft (~5 km) ~0.53 dB/kft (~1.6 dB/km)
24 AWG 18,000 ft (~5.8 km)
22 AWG
19 AWG
Note: 26 AWG = 0.4mm; 22 AWG = 0.6mm
Table 63: Attenuation Levels for Short and Long CO Trunks
Trunk Category (CO Trunk Circuit Descriptor form) Attenuation on Trunk Line