Carrier Access SNMP manual Detector Configuration, Wire E&M Signaling Options

Detector Configuration

between the positions indicated above. This makes configuration easier by changing several connec- tions with one move. The jumper pins are on 0.1” x 0.2” centers, making it impossible for the user to accidentally turn the jumper 90 degrees and short -48V to ground.

Figure 11-7shows the jumpers as they appear on the 4-wire E&M/TO card. Figure 11-7also shows each of the eight possible signaling combinations as complete channel setups.

Note: The jumpers do not change the actual interface pin assignments for the E&M signaling line connector. The detector and driver functions always stay on the same pinouts.

11.6 Detector Configuration

Jumper 1 is used to select options for configuring E&M signaling types I, II, IV and V. This jumper connects the detector to -48 Vdc or ground. It is also used to connect the Detector Return to -48 Vdc or ground. An on-hook signal from the far-end equipment does not cause current to flow through the detector. When the far-end equipment applies an off-hook signal, current flows in the detector, caus- ing the detector to be grounded. The processor receives this information and sends E&M signaling bits to the T1 line. The table below summarizes the signaling bits sent for both detector states:

E&M V1.1

							1
							11
				Type 5	Type 5
				Tandem	Normal
Type 4	Type 4	Type 2	Type 2	Type 1		Type 1
Tandem	Normal	Tandem	Normal	Tandem		Normal
							11
							1

Figure 11-7: 4-Wire E&M Signaling Options

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