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Using two span boards<br />
© <strong>Sangoma</strong> Technologies<br />
April 2013<br />
T1/E1 is 4 wires<br />
PSTN<br />
or<br />
PLMN<br />
Tx<br />
Rx<br />
Rx<br />
Tx<br />
Can only use<br />
Receive side<br />
(Tx ports unused)<br />
Port 1<br />
Rx<br />
Port 2<br />
Rx<br />
1 Span TAP = 2 span board (A102)<br />
2 Span TAP = 4 span board (A104)<br />
4 Span TAP = 8 span board (A108)<br />
Rx = Receive<br />
Tx = Transmit<br />
* Echo Cancellation not required<br />
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