Nortel-networks Circuit Card Instrukcja Użytkownika Strona 551

  • Pobierz
  • Dodaj do moich podręczników
  • Drukuj
  • Strona
    / 908
  • Spis treści
  • BOOKMARKI
  • Oceniono. / 5. Na podstawie oceny klientów
Przeglądanie stron 550
NT8D09 Analog Message Waiting Line card Page 551 of 906
Circuit Card Description and Installation
The NT8D09 Analog Message Waiting Line card also provides:
600 ohms balanced terminating impedance
analog-to-digital and digital-to-analog conversion of transmission and
reception signals for 16 audio phone lines
transmission and reception of Scan and Signaling Device (SSD)
signaling messages over a DS-30X signaling channel in A10 format
on-hook/off-hook status and switchhook flash detection
20 Hz ringing signal connection and automatic disconnection when the
station goes off-hook
synchronization for connecting and disconnecting the ringing signal to
zero crossing of ringing voltage
loopback of SSD messages and Pulse Code Modulation (PCM) signals
for diagnostic purposes
correct initialization of all features at power-up
direct reporting of digit dialed (500-type telephones) by collecting dial
pulses
connection of –150 V dc at 1 Hz to activate message waiting lamps
lamp status detection
disabling and enabling of selected units for maintenance
Figure 110 on page 552 shows a block diagram of the major functions
contained on the analog message waiting line card. Each of these functions
are described in the following sections.
Przeglądanie stron 550
1 2 ... 546 547 548 549 550 551 552 553 554 555 556 ... 907 908

Komentarze do niniejszej Instrukcji

Brak uwag