APPENDIX B: FXO Voice/Fax Interface Module
67
capacitor (default). To select 600
Ω
resistive,
place the strapping block over the right two-
thirds of E10, E11, and E12 as shown in Figure
B-5. To select 600
Ω
in series with a 2.15 µf
capacitor, place the strapping block over the left
two-thirds.
5. E13. This strap is reserved for use in internal
tests.
Do not alter it.
Standard FXO Interface Card
Do not alter any of the straps on the standard FXO
interface module. E1 through E5 have the same
function as E1 through E5 in the enhanced model.
E11 has the same function as E13 in the enhanced
model.
B.3 Removing or Replacing the Module
See
Section 3.4
for removing or replacing the
Multiserver 500 interface modules, including the
FXO interface module.
B.4 Specifications
Signals Supported —
Analog voice, Group 3
facsimile (fax), and modem
Fax Signal Types —
V.21 channel 2, V.27 ter 2400,
V.27 ter 4800, V.29 7200, and V.29 9600
Port Impedance —
Enhanced Model (Software-selectable)
600
Ω
(Default); may be strapped one of two
ways: 1. Matches line impedance of 600
Ω
resistive; 2. Matches line impedance of 600
Ω
in
series with a 2.15-µf capacitor (default)
Complex: Matches line impedance of 370 W in
series with a parallel network of a 0.3-µf
capacitor and a 620-
Ω
resistor
or
220
Ω
in series with a parallel network of a 0.12-
µf capacitor and an 820-
Ω
resistor
Standard Model
Fixed at 600
Ω
in series with a 2.15-µf capacitor
Insertion Loss —
2 dB nominal @ 1000 Hz (End-
to-End) between Transmit and Receive of Port 1
and
Transmit and Receive of Port 2.
Example: Port 1 is FXO LS port and Port 2 is
FXS LS port.
Port Return Loss —
Echo Return Loss:
≥
22 dB;
Singing Return Loss:
≥
18 dB 200 to 3400 Hz:
≥
16 dB
Longitudinal Balance —
200 Hz to 1000 Hz:
≥
58
dB; 1000 Hz to 3400 Hz:
≥
48 dB
Input and Output Levels: —
If you operate your
equipment in the U.S.A or Canada, input gain
and output attenuation are set at the factory to
0/0 dBm, and must not be changed. In other
countries, follow the standards of the country
where the equipment is used.
Maximum Input andOutput Levels —
0 dBm
Idle Channel Noise —
Inband, “C” Message:
≥
20
dBrnc; Psofometric:
≥
60 dBmpo; Out of band,
10 KHz to 10 MHz, Transverse or Longitudinal
Noise:
≤
70 dBm (enhanced models only)
Non-Linear Distortion, Second and Third
Harmonics (Multitone Signal) —
≥
40 dB below
signal level
Signal-to-Noise Ratio —
≥
37 dB @ 1000 Hz
Echo Suppression —
≥
35 dB
Echo Canceling —
≤
16 ms (
≤
1000 Km or
600 miles)
Crosstalk (near/far end) Between Channels —
≤
75 dB
Signaling —
DC Pulse Distortion Make/Break:
≤
3
%; AC DTMF, Transparently Passed:
≤
1.5%
DC Loop Range —
48 V Battery:
≤
1750 W; 42.5 V
Battery:
≤
1500 W
Off-Hook DC V/I Characteristics at Tip-Ring —
≤
300 W
Ringing Voltage Input 18 to 53 Hz —
Detect:
≥
25
Vrms; Not Detect:
≤
20 Vrms
Ringing Cadence Repeat Distortion —
≤
2 %
Size —
6.5"W
×
6"D (16.5
×
15.2 cm)
