10 — ONT technical specifications
10-12 July 2008 Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06
ONT Product Information Manual Edition 01 3FE 51892 AAAA TCZZA
10.5 POTS interface specifications
Table 10-17 provides specifications for the ONT voice service.
Table 10-17 Voice service specifications
Notes
(1)
Total DC supervisory range of 750 Ω, allowing for 1000 ft. of 26 AWG CAT3 cable, CPE equipment
and a margin allocation.
(2)
These items can be configured with the voip configuration xml file. The values specified are for
ANSI deployments.
10.6 VDSL2 interface specifications
The modular ONT (M-300-A) supports up to 12 VDSL2 lines via optional screw
terminal, IDC, or screw terminal with surge protection connectorization. The LP
MDU ONTs (O-24121V-A and the O-24120V-A) terminate up to 12 VDSL2 lines
using an RJ-21 connector. The O-00240V-A MDU ONT terminates up to 24 VDSL2
lines using an RJ-21 connector.
Similar to ADSL, VDSL2 operates over the copper wires in a telephone line to
provide both high-bandwidth service and POTS, and is asymmetric in its
downstream and upstream speeds. However, VDSL2 provides subscribers with a
higher bit rate than multi-ADSL and can achieve speeds over 57 Mb/s downstream
and 25 Mb/s upstream, compared with 24 Mb/s downstream and 1.3 Mb/s upstream
Service features Specifications for the ONT
Voice quality Toll quality voice with a mean opinion score (MOS) of 4 or better
DC supervisory range 750 Ω for outdoor ONTs
(1)
G.168 echo
cancellation
16 ms tail for signal path towards the subscriber
CODEC
(2)
G.711 (PCM 64 kb/s), G.729, and A-law and U-law encoding and decoding
Analog line
impedance
(2)
600 Ω
Ringing voltage
(2)
40 Vrms
Ringing capacity 5 REN (US) per POTS line
Off-hook dc current
(2)
25 mA
Maximum expected
DTMF signal level
0.0 dBm
Receive (D/A) loss
(2)
4 dB
Transmit (A/D) loss
(2)
2 dB
Loop start signaling —
Loop length Up to 300 m (984.25 ft)
Minimum on hook
voltage (I-241G-A and
I-240G-A)
-43 V
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