Carrier Access Access Bank II SNMP - Manual (Page 76)

Setting the FXS Transmit and Receive Levels
9/24/01 8-3
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.
Figure 8-1: FXS Transmit and Receive Level Options
UP (ON)
UP (ON)
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
XMT RCV
ON
1 2 3 4 5 6
XMT RCV
6 5 4 3 2 1
ON
BRFXS V x.x