Black Box COMPACT T1 MT850A - Manual (Page 388)

7-4 Compact T1 - Release 6.1
FXO Voice Card
Technical Specifications
FXO Transmission Performance
l Return Loss: ERL > 26 dB, SRL > 18 dB with respect to 900
Ω + 2.16µ
F
l Transhybrid Loss: ERL > 26 dB, SRL > 18 dB with respect to 900
Ω + 2.16µ
F
l Idle Noise: A/D < 16 dBrnC0, D/A, 12 dBrnC0
l Crosstalk Coupling: < 70 dB at 0 dBrn0
l Signal/Distortion: > 35 dB with 1004 Hz, 0 dBm0 input
l Overload: +3.0 dBm/900
Ω
l Frequency Response: +0.3 dB -1.0 dB from 300 to 3400 Hz
l Encoding:
µ
-law 255 for U.S. and Canada as defined in CCITT G.711 and G.712
l Terminating Impedance: 900
Ω
+
2.16µ
F
l Transmit Gain/Loss: +7 to -9 dB, switch selectable per card
l Receive Gain/Loss: +7 to -9 dB, switch selectable per card
l Modem Support: Full compatibility with V.90 modems
FXO Signaling Performance
l
DC Loop Range: > 1600
Ω
loop or ground start
l Ringer Equivalency Number (REN): 0.4B (AC)
l Ringing Voltage Detection: detects Class A ringing follows distinctive ringing
l FXO DC Resistance: 100
Ω
l Maximum DC: 150 mA
l Overvoltage: UL 1950, FCC Part 68 lightning protection
l Overcurrent: 600 V rms, 60 Amps
l Protection: solid-state (fuseless) overvoltage and over current protection
l Termination Type: FXO loop start or ground start, switch selectable per card or
via management interface per channel
l Signaling Selection: DPT functionality enabled/disabled on all 8 channels
l Address Signaling: DTMF or dial pulse
l Calling Party Disconnect: detects and forwards current interruption to disconnect
answering devices and modems