7-4 Compact T1 - Release 6.1
FXO Voice Card
Technical Specifications
FXO Transmission Performance
lReturn Loss: ERL > 26 dB, SRL > 18 dB with respe ct to 900Ω + 2.16µF
lTranshybrid Loss: ERL > 26 dB, SRL > 18 dB with respect to 900Ω + 2.16µF
lIdle Noise: A/D < 16 dBrnC0, D/A, 12 dBrnC0
lCrosstalk Coupling: < 70 dB at 0 dBrn0
lSignal/Distortion: > 35 dB with 1004 Hz, 0 dBm0 input
lOverload: +3.0 dBm/900Ω
lFrequency Response: +0.3 dB -1.0 dB from 300 to 3400 Hz
lEncoding: µ-law 255 for U.S. and Canada as defined in CCITT G.711 and G.712
lTerminating Impedance: 900Ω + 2.16µF
lTransmit Gain/Loss: +7 to -9 dB, switch selectable per card
lReceive Gain/Loss: +7 to -9 dB, switch select able per card
lModem Support: Full compatibility with V.90 modems
FXO Signaling Performance
lDC Loop Range: > 1600Ω loop or ground start
lRinger Equivalency Number (REN): 0.4B (AC)
lRinging Voltage Detection: detects Class A ringing follows distinctive ringing
lFXO DC Resistance: 100Ω
lMaximum DC: 150 mA
lOvervoltage: UL 1950, FCC Part 68 lightning protection
lOvercurrent: 600 V rms, 60 Amps
lProtection: solid-state (fuseless) overvoltage and over current protection
lTermination Type: FXO loop start or ground start, switch selectable per card or
via management interface per channel
lSignaling Selection: DPT functionality enabled/disabled on all 8 channels
lAddress Signaling: DTMF or dial pulse
lCalling Party Disconnect: detects and forwards current interruption to disconnect
answering devices and modems