Specifications

Chapter 7 Battery Reversal FXS/DPO
7-3
DPO
DPT*
PBX
Direct Inward Dial (DID)
Leased T1
Called
Party’s
Direct
Extension
* Use CAC’s FXO/DPT
12 Channel Voice Card
Remote
LEC
Switch
DID
Lines
DID
Lines
Figure 8-2. Dial Pulse Origination (DPO) for DID Transport
SETTING THE TRANSMIT AND RECEIVE LEVELS
The transmit and receive levels for each BRFXS/DPO voice frequency channel can be set between 0 and -
9 dB using twelve 6-position DIP switches (CH1 - CH12) on top of the circuit board card (see Figure 8-3).
Each analog channel uses a bank of six DIP switches, with three for transmit and three for receive.
Operation of each set of three switches in additive. For example, setting switch 1 (-2 dB) and switch 2 (-3
dB) to OFF for any given channel selects a receive loss of -5 dB. The default setting for the transmit level
is -3 dB; for the receive level it is -6 dB. The default settings are appropriate for most applications.
Figure 8-3. BRFXS/DPO Transmit and Receive Level Options
ON ON ON ON ON
ONONONONONON
CH6 CH5 CH4 CH3 CH2 CH1 CH12
CH11 CH10
CH9 CH8 CH7
ON
RCV XMT
-2dB -3dB -4dB -2dB -3dB -4dB
ON