Motorola V3229 Operating Instructions - Page 23

Setting Straps, HARDWARE, STRAPS, Tip and Ring, Polarity, Ground Strap, QM Disabled

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Setting Straps 3 Option Selection Two different printed circuit boards exist for the V.3229. After removing the cover use Figures 3-2a and 3-2b to identify which board is in your modem and to locate hardware straps. The board represented in Figure 3-2b has a piggyback board. Figure 3-3 shows a typical strap application. HARDWARE STRAPS Tip and Ring Polarity Ground Strap QM Disabled Strap illustrations in this section match the board with the TR LED. Some telephones are tip and ring polarity sensitive. If a dial tone is detected after dialing, reverse these two straps. * factory setting Signal ground is normally connected to chassis ground. If interference exists, isolate signal ground from chassis ground. When enabled, the Quality Monitor (QM) output is connected to the EIA-232 (pin 11) interface. Disabling it disconnects the QM output. Refer to Chapter 4 and Table 2-1 for more information. V.3229 / V.3229L -5

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V.3229 / V.3229L
<C#>-5
3
Option Selection
Two different printed circuit boards exist for the
V.3229. After removing the cover use Figures 3-2a
and 3-2b to identify which board is in your modem
and to locate hardware straps. The board represented
in Figure 3-2b has a piggyback board.
Setting Straps
Figure 3-3 shows a typical strap application.
HARDWARE
STRAPS
Strap illustrations in this section match the board
with the TR LED.
Tip and Ring
Polarity
Some telephones are tip and ring polarity sensitive.
If a dial tone is detected after dialing, reverse these
two straps.
* factory setting
Ground Strap
Signal ground is normally connected to chassis
ground. If interference exists, isolate signal ground
from chassis ground.
QM Disabled
When enabled, the Quality Monitor (QM) output is
connected to the EIA-232 (pin 11) interface.
Dis-
abling it disconnects the QM output. Refer to Chap-
ter 4 and Table 2-1 for more information.