COMSPHERE 3550 Series Data Service Units
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| Table | |
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| Model 3551 DSU Jumper Straps | ||
Strap | State of |
| Function | |
Designation | Jumper Strap | |||
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J12 | Left |
| V.35 Test Mode Indication: | |
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| Left Ð Enables V.35 Test Mode Indication (Pins 1 and 2). This is the | |
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| factory default. | |
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| Right Ð Disables V.35 Test Mode Indication (Pins 2 and 3). | |
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J13 | Left |
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| Left Ð Enables | |
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| (Pins 1 and 2). This is the factory default. | |
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| Right Ð Disables | |
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| (Pins 2 and 3). | |
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J20 | Left |
| Alarm Monitoring (used with the ±48 Vdc Central Office Power Unit): | |
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| Left Ð Disables the ±48 Vdc alarm monitoring function | |
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| (Pins 1 and 2). This is the factory default. | |
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| Right Ð Enables the ±48 Vdc alarm monitoring function | |
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| (Pins 2 and 3); the NMS adapter cable is being used for alarm | |
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| monitoring. | |
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J21 | Right |
| Alarm Monitoring (used with the ±48 Vdc Central Office Power Unit): | |
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| Left Ð Enables control of alarm monitoring via the NMS adapter | |
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| cable (Pins 1 and 2); the NMS adapter cable is being used for alarm | |
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| monitoring. | |
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| Right Ð Disables control of alarm monitoring via the NMS adapter | |
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| cable (Pins 2 and 3); a standard | |
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| cable is being used for the diagnostic channel. This is the factory | |
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| default. | |
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December 1996 |