Specifications | 246
DFXO Dual foreign exchange office interface
General
Audio 64 kbit/s (PCM as per ITU G.711)
32, 24 and 16 kbit/s (ADPCM as per ITU G.726 and ANSI
TI.303)
Signalling allocation 8 or 32 kbit/s allocated for CAS
Companding A-Law or µ-Law
Maximum line length 600 metres (2000 feet) on 0.4 mm / 26 AWG copper pair
Calling line ID (CLI) Support provided for ETSI: EN 300 659-1 & 2 and BT: SIN
227 and 242
Fax Conforms to G3 standard for 64 kbit/s PCM and 32 kbit/s
ADPCM compression
Analogue
Transmission performance
characteristics
ITU G.712 E2 for an operating level range of -6 dBr to +1 dBr
Input level range -10 dBr to +1.0 dBr in 0.5 dB steps
Output level range -10 dBr to +1.0 dBr in 0.5 dB steps
Default Input level -4.0 dBr
Default Output level -1.0 dBr
Maximum level +3.14 dBm0
Line impedance / Hybrid
balance impedance options
600
900
600 + 2.16 µF
900 + 2.16 µF
270 + 750 || 150 nF (TBR-21)
220 + 820 || 120 nF (TN12)
370 + 620 || 310 nF (BT3)
320 + 1050 || 210 nF (BT Network)
200 + 680 || 100 nF (China)
Return Loss better than 20 dB over the frequency range 200 - 3600 Hz
Trans hybrid loss better than 30 dB between 300 - 3400 Hz (with matched
external line and hybrid balance impedance)
Common mode rejection ratio better than 40 dB over the frequency range 50 - 3600 Hz
Echo Canceller provides up to 64 ms of echo cancellation
To Next Page
Loading...
