Black Box 5000 - Manual (Page 17)

Multiserver 5000
16
MS1 Voice/Fax Cards
MX225C-1 AND MX225C-2
General Specifications
Channels per Voice/Fax Card —
MX225C-1: One channel
MX225C-2: Two channels
Signals Supported — Analog voice and Group III
fascimile (fax)
Telephone Interfaces —
PBX tie trunk: E&M Types I through V,
2-wire or 4-wire;
PBX station or Central Office PSTN: OPX
Loop Start, 2-wire;
Key telephone systems, telephone set or PBX
CO Trunk: KTS Loop Start, 2-wire;
Compatible Connections: OPX to KTS;
E&M to E&M; E&M to KTS; KTS to KTS (ring-
down)
Interface Connectors — RJ-11 modular jack for
KTS- and OPX-type interfaces; 8-pin terminal
block for KTS, OPX, and E&M type interfaces
Indicators per Channel —
OK - OK
LO - Local Off-Hook
RO - Remote Off-Hook
LS - Local Speech
RS - Remote Speech
TM - Test
Diagnostics — Self-Test, Loopback, and Input Level
Display
Analog Specifications
Insertion Loss — 2 dB nominal @ 1000 Hz (End-to-
End)
Audio Levels —
Input/Output Levels: 0 dBm maximum
Adjustable Range: +28 dB to –28 dB in steps of
1 dB
Frequency Response — 300 Hz to 3000 Hz @ +1.5
dB/-2 dB
Idle Channel Noise —
≤22 dBrnC
Non-Linear Distortion — Second Harmonic
≥40 dB
below Signal; (4 tone method): Third Harmonic
≥40 dB below Signal
Signal to Noise Ratio —
≥37 dB
Input Impedances —
E&M 4-wire, E&M 2-wire, KTS 2-wire: 600
Ω,
±10 percent, balanced
OPX 2-wire: 600
Ω nominal
Return Loss —
Echo Return Loss:
≥20 dB
Singing Return Loss:
Low:
≥14 dB
High:
≥14 dB
Longitudinal Balance —
200 to 1000 Hz:
≥58 dB
1000 to 3000 Hz:
≥53 dB
Echo Canceling —
≤4 milliseconds (≤150 miles)
Echo Suppression —
≥ 35 dB
Crosstalk (near/far end) —
E&M 4 wire:
≥75 dB transmit to receive;
between channels:
≥75 dB