A-law or -law coding Most signaling conventions supported Multi-color LED indicators for each card Battery reverse supported DID supported Intended for use with 110-220Vac or -48Vdc powered main units
Loop Telecom's QFXS/ QFXO plug-in cards are a series of 2 different plug-in cards designed for the Loop-V4200 9-port and 28-port. They allow voice frequency interfaces to be multiplexed as a 64 Kbps DS0 signal onto a digital network. QFXS provides four connections. The QFXO provides connections from four telephone lines, either from a central office or from a PBX.
Coding is either A-law or -law selectable by user. Most popular signaling conventions are supported, including PLAR.
" where x is used to select version type:
| x = | Description | Note |
| A | follows ANSI signaling bits | |
| S | follows customer's special bits assignment | |
| T | trunk condition OFF-HOOK | " T, AT, ST are for QFXO only |
| AT | follows ANSI signaling bits w/ trunk condition OFF-HOOK | |
| ST | follows customer's special bits assignment w/ trunk condition OFF-HOOK |
Quad FXS voice card (4 FXS per plug-in) Quad FXO voice card (4 FXO per plug-in)
| Connector | QFXS: 1, 2, 3, or 4 FXS per connector, QFXO: 1, 2, 3, or 4 FXO per connector |
| Power for QFXS | 110-220Vac or /48Vdc |
| Power for QFXO | 110-220Vac, 24Vdc, or /48Vdc |
| Alarm Conditioning Encoding | CGA busy after 2.5 seconds of LOS, LOF A-law or -law, user selectable together for all |
| Impedance | Balanced 600 or 900 ohms (selectable together for all) |
| Longitudinal Rejection Loss Adjustment | 55 dB 0, 3, 6, or 9 dB transmit & receive |
| Signal/ Distortion Frequency Response | > 46dB with 1004 Hz, 0dBm input - 0.25 to -1 dB from 300 to 3400 Hz |
| FXS Loop Feed FXO Ringing REN | Nominal - 48Vdc with 20mA current limit 0.5B (AC) |
| FXS Ringing | 4 REN at 5K meters per port 20 Hz, other frequencies by special order |
| 78 v rms (sine wave) 2 sec on 4 sec off, or 1 sec on 2 sec off optional for PLAR |
| Metering Pulse | 12KHz/ 16KHz | ||
|---|---|---|---|
| y | Power: 0dBm, -12dBm (Resistor selectable) | ||
| y | Sensitivity: -18dBm to -45dBm (Resistor selectable) | ||
| Signaling | Loop Start, GND-Start, Metering Pulse | (12KHz, 16KHz), DTMF, Dialing Pulse, PLAR, | |
| Battery Reverse | |||
All in-band signaling tones are carried transparently by the digitizing process. Customer is responsible for in-band signaling compatibility between a telephone and a switch, or between a PBX and a switch.
| FXS | FXO | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PLAR OFF | PLAR ON | Tx | Rx | ||||||||||||||||||||||
| Tx | Rx | Tx | Rx | ||||||||||||||||||||||
| A | B | C | D | A | B | C | D | A | B | C | D | A | B | C | D | A | B | C | D | A | B | C | D | ||
| Normal | ON HOOK | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | * | * | * | ||||||||||||
| OFF HOOK | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | |||||||||||||
| A Bit Invert | ON HOOK | 1 | 1 | 0 | 1 | 1 | * | * | * | ||||||||||||||||
| OFF HOOK | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | |||||||||||||||||
| Normal | NO RING | * | 1 | * | * | 0 | * | * | * | 0 | 1 | 0 | 1 | ||||||||||||
| RING ON | 0 | 0 | * | * | 1 | 1 | * | * | 0 | 0 | 0 | 1 | |||||||||||||
| A Bit Invert | NO RING | * | 1 | * | * | 1 | 1 | 0 | 1 | ||||||||||||||||
| RING ON | 1 | 0 | * | * | 1 | 0 | 0 | 1 | |||||||||||||||||
| Normal | Battery Reverse | 0 | 1 | * | 0 | 0 | 1 | 0 | 0 | ||||||||||||||||
| A Bit Invert | Battery Reverse | 1 | 1 | * | 0 | 1 | 1 | 0 | 0 | ||||||||||||||||
| Pay Phone | Metering Pulse | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | ||||||||||||||||
| GND-Start | Tip Open | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | ||||||||||||||||
| Ring GND | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | |||||||||||||||||
NOTE 1: * = Don't care.
