NEC 616 manual On - OFF

260 installing Options

260.1Music On Hold

Provision has been made to allow connection of a locally provided external music source to provide Music- On-Hold for held CO/PBX calls. Connection of the Music Source is made at the Jl Block of the Main Distribution Frame (MDF). The output signal level should be approxi- mately 1 milliwatt with 8 ohms impedance. See Figure 260.3 and Table 240.3 for connection information to MDF .

260.2External Paging Speaker

When a PBS-S KTU is installed in the ES -6 - 1 KSU, external paging with meet-me answer can be provided. The PBS-S KTU contains a 1-watt Amplifier and Control Circuit for one-zone paging (when a l-watt amplifier is

insufficient, see Section 260.5.) The External Speaker should be locally-supplied in correspondence to the output

impedance of 600 ohms. The Volume Control (VRl), located on the PBS-S, provides a way to increase or de- crease the output signal of the amplifier to the speakers. To adjust output signal, turn VR1 clockwise to increase

signal, and counterclockwise to lower signal. An LED is provided on PBS-S KTU to indicate when paging is being used. When an External Page is answered (meet-me-answer), the PBS-S is released to allow access for another page. See Figure 2 60-3 and Table 240-3 for connection informa- tion to MDF.

2605 External Paging Amplifier

The PBS-SKTU contains a l-watt Amplifier and control circuit for external paging. For applications where 1-watt is insufficient, an external amplifier may be used. Provision has been made to allow connection of a locally- provided amplifier to the MDF for this purpose. The PBS-S KTU is required when an external amplifier is used. See Figure 2604 and Table 240-3 for connection information to the MDF.

260.6External Background Music when External Amplifier is Used

To provide for background music with an external amplifier installed, set the SW4 switch io the “ON” posi- tion and the SW3 switch to the “OFF” position on the PBS-S KTU. When background music is not required set the SW3 switch to the “ON” position and the SW4 switch to the “OFF” position. Music will be cut off from the . paging speakers when external paging is accessed. The output level and impedance of the music source should match the input level and impedance of the external amplifier. See Figure 2604 and Table 240-3 for connec- tion information to the MDF.

ON c-.-.. OFF ON - - OFF

260.3External Background Music when PBS-S KTU is Used

When a PBS-S KTU is installed, an external locally- provided music source can be used to supply background music over the External Paging System. The recommended output of the music source is l-watt with 600 ohms im- pedance. When external paging is accessed music is cut off

from the paging speaker. Connection is made on the Jl block of the MDF. See Figure 260-3 and Table 240-3 for connection information to MDF.

260.4External Tone Ringer

Provision has been made to allow connection of locally provided External Tone Ringer to supply common audible on all incoming CO/PBX calls. For this purpose a relay contact is prepared on the CLK-S KTlJ. which

provides an interrupted closure (1 SEC. on/ 1 SEC. off) during the CO/PBX Ring Cycle. The signal of the tone

ringer can be controlled by a locally provided control switch. See Figure 260-3 and Table 240-3 for connection information to MDF.

SW3SW4

Fig. 260-I PBS-S Switches for BGM

260-7Power Failure Telephones

ET-6-l Ke:J Telephone Sets cannot be used to

originate or answer calls during a commercial power

failure. Locally-provided single line telephone sets can be installed for this purpose. The KSU provides automatic power failure for CO/PBX lines 1 and 2. No optional KTU

is required. Connection of the Single Line Telephones is made at the Jl block of the MDF. Single Line Telephones with appropriate dials (rotary or DTMF) should be installed if the capability of dialing out during a power outage is desired. See Figtire 260-3 and Table 240-3 for connection information to MDF.

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