| INSTALLATION |
Table 3 - Configurations by Interface Characteristic (Rev A Main Board)
INTERFACE
CHARACTERISTIC
Audio Circuit
Signaling
Loop Start
Ground Start
E&M
External Reference
Internal Ground
Internal
Idle
External Reference
Internal Ground
Internal
Busy
External Reference
Internal Ground
Internal
1
A B A
E
M
E
| JUMPER POSITIONS FOR JP1 THROUGH JP15 |
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2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | F2 | F3 |
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B | B |
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| A | A |
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A+C | A+C |
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| B | B |
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| A | B |
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| A |
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| B | A |
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| B | A |
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| C+M |
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| IN | IN |
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| IN |
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| A |
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| OUT |
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| OUT |
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| A |
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| IN |
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| OUT | OUT |
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| B |
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| IN |
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| IN |
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| not B |
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| OUT |
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| OUT |
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| IN |
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| IN |
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| not B |
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| OUT |
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| OUT |
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| IN |
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| IN |
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