Filter
Top Products
Battery Reversal FXS & Dial Pulse Origination Card
9-18 9/24/01
Figure 9-2: Dial Pulse Origination (DPO) for DID Transport
9.5 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 9-3). 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.
Table 9-1: Transmit and Receive Attenuation Switch Values
Switch
Setting
Transmit Switch Position Loss Receive Switch Position Loss
1 2 3 4 5 6
On000000
Off-2-3-4-2-3-4
Called Party's
Direct Extension
D
P
O
*
D
P
T
*
PBX
DID
Lines
Direct Inward Dial (DID)
Leased T1
* Use CAC's FXO/DPT 12-Channel
voice card
Remote LEC
Switch
DID
Lines