Carrier Access Access Bank II SNMP - Manual (Page 110)

Detector Configuration
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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 11-7 shows the jumpers as they appear on the 4-wire E&M/TO card. Figure 11-7 also 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:
Figure 11-7: 4-Wire E&M Signaling Options
E&M V1.1
1
11
Type 1
Normal Type 1
Tandem Type 2
Normal Type 2
Tandem Type 4
Normal Type 4
Tandem
Type 5
Normal Type 5
Tandem
1
11