Carrier Access SNMP manual Setting the Transmit and Receive Levels

Battery Reversal FXS & Dial Pulse Origination Card

Remote LEC

Switch

	Direct Inward Dial (DID)
DID		DID	PBX
Lines	Leased T1	Lines
DPO*		DPT*

* Use CAC's FXO/DPT 12-Channel voice card

Called Party's

Direct Extension

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	Transmit Switch Position Loss			Receive Switch Position Loss
Setting	1	2	3	4	5	6
On	0	0	0	0	0	0
Off	-2	-3	-4	-2	-3	-4

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