• 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 Trunk Impedance Characteristics
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.
Table 26: Brazil: LS Trunk Impedance Values
Note: “Non-IP” impedance values apply to trunks that are not connected to an IP port;
and “IP” values apply to trunks that are connected to an IP port.
Table 25: Australia: LS Trunk Impedance Values
Balance Network
Setting
(CO Trunk Circuit
Descriptor Form)
LS Impedance Values
Non-IP IP
AC Balance AC Balance
600
600 600 600 600
National Complex
200R+
(820R||120nF)
200R+
(820R||120nF)
200R+
(820R||120nF)
200R+
(820R||120nF)
TBR21
Same as
“National
Complex”
Same as
“National
Complex”
Same as
“National
Complex”
Same as
“National
Complex”
Alternate Complex
Same as
“National
Complex”
Same as
“National
Complex”
Same as
“National
Complex”
Same as
“National
Complex”
Spares 1, 2, 3, and 4
600 600 600 600
Notes: Note: No difference between settings for IP or non-IP connections.
Balance Network
Setting
(CO Trunk Circuit
Descriptor Form)
LS Impedance Values
Non-IP IP
AC Balance AC Balance
600
600 600 600 600
National Complex
900 350R+(1000R||210nF) 600 0R+(800R||50nF)
TBR21
600 Same as “National Complex” 600 Same as “National
Complex”
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