Carrier Access SNMP manual Setting the FXS Transmit and Receive Levels, Wink Delay

Setting the FXS Transmit and Receive Levels

8.3.3 Wink Delay

Select Wink Delay to translate two-state wink-start signaling toward the T1 network to an FXS ring- ing with delayed wink for proceed-to-send digit indication. Upon detection of an incoming seizure from the T1 network, the AB2 applies ringing voltage to the FXS channel. When the attached equip- ment answers by closing the loop, the Access Bank II - SNMP winks the network for “proceed to send,” allowing the attached equipment to receive DTMF digits carrying Automatic Number Identifi- cation (ANI) or Directory Number Identification Service (DNIS). This is particularly useful for voice mail, voice response, call distribution, and automatic attendant applications. Standard loop-start PC voice mail and fax cards can be used for ANI and DNIS applications, without the added expense and complexity of installing signaling converters.

8.4 Setting the FXS Transmit and Receive Levels

The transmit and receive attenuation levels for each FXS 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 (see Fig- ure 8-1). 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.

BRFXS V x.x

6 5 4 3 2 1

XMT RCV

ON

UP (ON)

4

3

2

1

4

3

2

1

4

3

2

1

4

3

2

1

UP (ON)

ON

1 2 3 4 5 6

RCV XMT

Figure 8-1: FXS Transmit and Receive Level Options

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