ZETRON 2000 Series Spezifikationen PDF herunterladen (Seite 201)

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Upgrades

Software upgrades to the ADPCM Voice Card (702-9153) are made like other 2000 Series

software through the maintenance modem port via telephone calls from Zetron

Applications Engineers. Extra voice channels are available in sets of four channels as field

upgrade kits. These kits add chips for the new channels and replace certain decoder chips.

Refer to the instructions that come with the kits.

Installing New ICs in the Voice Card

♦ Adding upgrade ICs

1. Turn off the power to the paging terminal.

2. Remove the ADPCM card by first removing the screw at the top of the card and

then pulling out the latch at the bottom of the card. Carefully work the card lose

from the sockets on the backplane of the paging terminal.

3. Place the card on a firm, flat, static-safe surface and install ICs as necessary to

match information in Table 24.

4. Carefully inspect your work. The notched end of each IC should match the notched

end of its socket. Correctly installed, the pins of each IC will be fully inserted and

not bent under the chip or hanging outside the socket.

5. Reinstall the voice card by sliding it into its card guides and pushing straight back.

It should plug firmly into two bus sockets, one at top and one at bottom. When

properly inserted, the card's front panel is flush with the other circuit cards.

6. Restore power to the system. After approximately 30 seconds, you should see the

PRG and MEM lights come on and remain lit.

Table 24: Adding Channels to ADPCM Card

Channels Added NEC D77C30C X-Coders U4 PAL

4 U21 through U24 601-0157

8 U17 through U24 601-0920

12 U13 through U24 601-0921

16 U9 through U24 601-0922

1 2 ... 196 197 198 199 200 201 202 203 204 205 206 ... 375 376

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ZETRON 2000 Series Spezifikationen Seite 201