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FXO Voice Card
Technical Specifications
FXO Transmission Performance
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Return Loss: ERL > 26 dB, SRL > 18 dB with respect to 900
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Transhybrid Loss: ERL > 26 dB, SRL > 18 dB with respect to 900
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Idle Noise: A/D < 16 dBrnC0, D/A, 12 dBrnC0
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Crosstalk Coupling: < 70 dB at 0 dBrn0
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Signal/Distortion: > 35 dB with 1004 Hz, 0 dBm0 input
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Overload: +3.0 dBm/900
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Frequency Response: +0.3 dB -1.0 dB from 300 to 3400 Hz
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Encoding: -law 255 for U.S. and Canada as defined in CCITT G.711 and G.712
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Terminating Impedance: 900
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Transmit Gain/Loss: +7 to -9 dB, switch selectable per card
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Receive Gain/Loss: +7 to -9 dB, switch selectable per card
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Modem Support: Full compatibility with V.90 modems
FXO Signaling Performance
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DC Loop Range: > 1600
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Ringer Equivalency Number (REN): 0.4B (AC)
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Ringing Voltage Detection: detects Class A ringing follows distinctive ringing
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FXO DC Resistance: 100
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Maximum DC: 150 mA
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Overvoltage: UL 1950, FCC Part 68 lightning protection
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Overcurrent: 600 V rms, 60 Amps
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Protection: solid-state (fuseless) overvoltage and over current protection
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Termination Type: FXO loop start or ground start, switch selectable per card or
via management interface per channel
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Signaling Selection: DPT functionality enabled/disabled on all 8 channels
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Address Signaling: DTMF or dial pulse
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Calling Party Disconnect: detects and forwards current interruption to disconnect
answering devices and modems
7-4
+
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loop or ground start
F
Compact T1 - Release 6.1
F
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