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2.4 Installation of Optional Cards and Unit
76 General Installation
2.4.4 16 SLT Line Circuit Unit
To add eight extensions which contain two single line telephones, use the optional 16 SLT Line
Circuit Unit (KX-TD174). The unit can support 16 single line telephones per unit. Each single
line telephone in the same jack has different extension number so that it can act as completely
different extension like an eXtra Device Port feature.
Note
• Installing this unit allows the eXtra Device Port setting to "Enable" automatically in
system programming [600]. However, assigning "Disable" makes a single line telephone
which is connected to the second jack (Jack xx-2) disable to use.
• This unit cannot support the proprietary telephone and Voice Mail Integration features.
• This unit has four DTMF receivers; two receivers in the first eight ports and two
receivers in the last eight ports.
• The Ringing Patterns for all single line telephones which are connected to the system are
changed as below;
Auxiliary Connection for Power Failure Transfer
When there is a power failure, the first two jacks on this unit can be connected to specific CO
lines mentioned below. An auxiliary connection is required to implement this feature. For more
information about the connection between an extension jack to a CO line, refer to Section
2.5 Auxiliary Connection for Power Failure Transfer.
Programming Guide References
[109] Expansion Unit Type
[600] EXtra Device Port
Incoming call from extension
1s
Incoming call from outside line
1s