
Model 4821/4820 Control/Communicator Installation Manual
4-32 150964
4.20 Telephone Line Connection
Connect the 4821/4820 to the telephone line using an RJ31X cord. Silent Knight’s Model
7860 is available for this purpose. Connect as shown in Figure 4-22.
Figure 4-22 Telephone Line Connection
Note: To comply with industry standards, this product is equipped with line seizure. Any time the system’s dialer
needs to communicate with the central station, it will not be possible to use any telephones that are on the
same line(s) as the system. Normally this condition will last approximately one minute, but under adverse
telephone conditions, could last for as long as 15 minutes.
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