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SA2532KA Arkusz danych(PDF) 7 Page - Sames |
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SA2532KA Arkusz danych(HTML) 7 Page - Sames |
7 / 21 page SA2532KA/B 7 /21 sames sames sames sames Moving Cursor Procedure To accommodate easy and uncomplicated redialling (LNR) behind a PABX, a sliding cursor protocol is implemented. If new entries match the previous RAM contents, pressing the LNR key will dial out the remaining digits. If there is an error in matching, the LNR will be inhibited until next on-hook, and the RAM will contain the new number. In the case of mixed mode LNR operation the redialling in the SA2532KA is limited to the LD digits so as to prevent unauthorised access to banking passwords etc. The SA2532KB will dial out all digits (i.e. both the pulse and the DTMF digits) during mixed mode re-dialling. DTMF Tones The DTMF generator provides 7 frequencies, namely: Low group Digit 1-2-3 697Hz Digit 4-5-6 770Hz Digit 7-8-9 852Hz Digit *-0-# 941Hz High group Digit 1-4-7-* 1209Hz Digit 2-5-8-0 1336 Hz Digit 3-6-9-# 1477Hz The MF output levels are -6/-8 dBm and the preemphasis is 2.6dB. Tone Ringer The Tone Ringer of the SA2532K incorporates a Discriminator Circuit and a three tone Melody Generator. When a Valid Ring Signal is detected the Melody generator is activated and creates a ringing signal comprising 3 frequencies F1 (1065Hz), F2 (1420Hz) and F3 (1734Hz). These frequencies are repeated in a sequence of 6 time slots constructed by the frequencies F1 F2 F3 F1 F2 F3 This sequence is repeated 7 times per second. Ring Frequency Discrimination The Ring Frequency Discriminator assures that signals with a frequency between 13 Hz to 70 Hz are regarded as valid ring signals. When a valid ring signal is detected, the melody generator is activated and remains active as long as the ring signal is present. Once the melody generator has been started, the ring signal is continuously monitored and the melody generator is instantly turned on or off according to the momentary presence of a valid or invalid ring signal respectively (until next POR of off-hook). |
Podobny numer części - SA2532KA |
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Podobny opis - SA2532KA |
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