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Model 3520
Product Overview
Key Features
Specifications
Model 3520 Modem-On-Hold Tester: Advance Specifications

Central Office Simulation
Line Type Two-wire, loop start
Source AC Impedance Selectable 600 ., 900 ., or 270 . + (750 . //150nF)
CO Voltage Floating +/- 48 VDC (+/- 2 V)
Line Current Programmable from 10 to 80 mA (+/- 2 mA)
Ringing Voltage 20 to 80 Hz, 15 to 80 Vac RMS (+/- 2 V)
Artificial Line Simulation 0, 6Kft, 9Kft, or 15Kft (26AWG)
Audio Path Routed to Secondary CO Line, FXO Port, or CODEC
Secondary CO Line (Client to Client Connection)
Line type Two-Wire, fixed feed (12V)
2 to 4 Wire Hybrid Optimized for 600 ohm impedance
Signaling Direct Connect Under Software Control

FXO Port (Client to V.90 Tester or POTS Line)
Type Two-Wire, loop start DAA, FCC Part 68 and CTR 21
2 to 4 Wire Hybrid Optimized for 600 ohm impedance
Signaling DTMF Pass-Through from Client Modem
Distortion -85 dB typical @ 1000Hz

Digital Port (Client to RAS)
Type 4-Wire T1 Short-Haul interface, 1.544Mbps
Signaling T1 Robbed Bit Signaling with Wink-Start
CODEC PCM u-Law and A-Law selectable

Call Waiting and CAS Generation
Level Resolution and Accuracy 0 to -48 dBm in 1 dB steps (+/- 1 dB)
Frequency Resolution and Accuracy Programmable to +/- 5% of nominal (+/- 1 Hz)
Duration Programmable from 40 to 200 mS

FSK Caller ID generation
FSK Transmitter Standards Bell 202 and ITU V.23
Level Resolution and Accuracy 0 to -48 dBm in 1 dB steps (+/- 1 dB)
Frequency Resolution and Accuracy Programmable to within +/- 5% of nominal freq.

Noise Generation
Type Flat (>20 KHz), Pseudo-random
Range 20 to 90 dBrnC in 1 dB steps

Controller System
Controller 486SX, 100 MHz
Memory 10MB DRAM, 24MB DiskOnChip (expandable)

Mechanical
Size 10" x 4" x 13" (25 cm x 10 cm by 33 cm)
Weight 10 lbs (4.5 kg)
Operating Temperature 32 F to 122 F (0 C to 50 C)

Specifications subject to change without notice.

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