The Model 271 Ground Start to Loop Start Converter links equipment ports intended for connection to ground start trunk circuits to loop start trunk circuits.
The Model 271 provides four circuits of ground start to loop start conversion. The unit is designed to be installed at the customer premises, adjacent to the equipment containing the ground start trunk ports.
The Model 271 can be powered with 24 Vac, –24 Vdc, or –48 Vdc. There are no switches to set or straps to cut; the unit automatically adjusts to the power that is connected.
The Model 271 is completely self-contained in a wall-mounted cabinet. Interconnections are made using a 25-pair plug. The Model 271 is FCC registered.
Model 271 Specifications
Number of Conversion Circuits: 4
Ringing Voltage: 60-150 Vac, 16-68 Hz
Ringing Detect Time: 100 milliseconds (nominal)
Circuit Release after Ringing Time: 6 seconds (nominal)
Minimum Ring Lead Current: 12 mA
Loop Current Detect Time: 10 milliseconds (nominal)
Loop Current Disconnect Time: 375 milliseconds (nominal)
Maximum Loop Resistance: limited by loop start trunk loop limit
Environment: 0 to 50 degrees C, humidity to 95% (no condensation)
Registration Number: BVV8VH-19259-OT-N
Ringer Equivalence: 1.0B
Radiated Noise Compliance: contains no circuitry subject to EMI regulations
Reliability: MTBF 27.8 years, per Method 1 of Bellcore TS-TSY-000332, Issue 3, September 1990
Interconnections: contains one 25-pair plug; installer must supply one cable terminated with 25-pair connector
18 to 30 Vac, 100 mA maximum
Class 2 power transformer only, minimum 5 VA rating –22 to –56 Vdc, 75 mA maximum
8.75 inches high (22.2 cm)
8.75 inches wide (22.2 cm)
3.25 inches deep (8.3 cm)
Mounting: wall mounts with four #8 pan-head screws
Weight: approximately 1 pound (0.5 kg)
Specifications subject to change without notice.