User manual ASL INTERCOM WS 200

[. . . ] After unpacking the unit please inspect for any physical damage, and retain the shipping carton and relevant packing materials for use should the unit need returning. If any damage has occurred, please notify your dealer immediately so that a written claim can be initiated. Please also refer to the guarantee section of this manual. If any are missing, contact your dealer. 3. 0 INSTALLATION This WS 200 will form the base station for a WS 19 or WS 29 beltpack and the interface for that beltpack to the wired intercom system. The unit has it's own mains power supply and will therefore not be any load to the wired intercom system. [. . . ] Half duplex allows more than 1 beltpack on the same frequency and therefore, on one TX/RX unit of a base station. Every beltpack will be able to listen to the base station, but only one of the listening beltpacks can talk at a time and have a full duplex connection. As long as one of the beltpacks has a full duplex connection, the other beltpacks will not be able to CALL or TALK. In this mode it is useful not to adjust the sidetone trimmer on the base station, turn it fully counter clockwise. Read the next chapter about communication modes carefully. User Manual WS 200 / Issue 1 © 2002 ASL Intercom, Utrecht, Holland. 6 7. 0 COMMUNICATION MODES This system is designed to offer a maximum of 8 wireless, full duplex, beltpacks. Each beltpack may be a single channel beltpack WS 19 or a dual channel beltpack WS 29. On this channel the communication between the beltpack and the base station will take place. If another base station is set to the same channel the communication will be garbled and will result in a none functioning connection. The base station will automatically select the right mode for a WS 19 or WS 29 beltpack. A WS 19 beltpack will always be connected to one channel at the base station, a WS 29 beltpack will be assigned to two channels on the base station. Channel 1 will be accomplished by selecting channel 1 on the beltpack, and channel 1 on TX/RX unit 1 of the base station. The sidetone needs to be adjusted at the front of the base station and the user of the beltpack can adjust his own voice at the beltpack with the designated trimmer. Channel 1 to a TX/RX unit of a base station (also channel 1 selected) results in a half duplex connection. This means that all the beltpacks can listen to the same TX/RX unit of the base station. Only one beltpack can TALK to the base station. User Manual WS 200 / Issue 1 © 2002 ASL Intercom, Utrecht, Holland. The beltpack that selects TALK mode will occupy the connection, and the TALK function of all other listening beltpacks is disabled. The same applies for sending CALL signals, only one beltpack may send a call signal but all of them will receive it. There is one major drawback to half duplex mode, due to the principle of the partyline concept. In case of a very good adjusted sidetone trimmer at the base station this effect will be noticed: When 2 or more beltpacks are using the same TX/RX unit of a base station (listening to the same signal), and one of the beltpacks is talking to the base station, the listening beltpack will not be able to hear the talking beltpack. This effect is caused by the adjusted sidetone that prevents the microphone signal of a beltpack to be heard by himself, and therefore, also heard by other beltpacks on the same TX/RX unit. To solve this, the sidetone trimmer of the TX/RX unit should be turned fully counter clockwise. This has one disadvantage too, if a beltpack talks to the base he will hear his own voice in his headset with a delay of 24 ms. By adjusting the OWN VOICE trimmer at the beltpack the effect can be made less. 7 8. 0 PRINCIPLES OF OPERATION The wireless system uses the 2, 4 GHz band, which is freely available for WLAN (Wireless Local Area Networks). [. . . ] output level frequency response PARTYLINE MODE: INTERCOM LINE DRIVER Max. output current output impedance 90 ­ 240 V AC 50 ­ 60 Hz 1250 mAT 25 Watt < 25 ohms 600 ohms +20 to -20 dBm 40 Hz - 20 Khz 3mA rms > 150 Kohm SIDETONE rejection min. 0dBm) signal-to-noise 70dB station bridging impedance >150 Kohm DIMENSIONS AND WEIGHT width height depth weight 11. 0 WARRANTY ASL Intercom warrants this unit to the original end-user purchaser against defects in workmanship and materials in its manufacture for a period of two years from date of shipment to the end-user. Faults arising from misuse, unauthorized modifications or accidents are not covered by this warranty. [. . . ]