3 — ONT and MDU general and interface technical specifications
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.42a March 2011 3-7
3FE 54199 AAAA TCZZA Edition 01 ONT Product Information Guide
3.4 POTS interface specifications
Table 3-4 lists specifications for the ONT voice service.
Table 3-4 Voice service specifications
Notes
(1)
These items are determined by the country-specific VoIP configuration XML file. The values
specified are for ANSI deployments.
(2)
While the maximum ringing capacity for all ONTs is five REN per POTS line, some ONTs can support
more than one POTS line at a time. For MDUs and business ONTs, the maximum ringing capacity is
three POTS lines with a five REN load ringing simultaneously. For indoor ONTs, the maximum
ringing capacity is two POTS lines with a five REN load ringing simultaneously.
SIP Overview
Voice-over-IP (VoIP) implementations enable users to carry voice traffic over an IP
network. A VoIP system consists of a number of different components: softswitch,
gatekeeper, user agent, signaling gateway and a call manager etc., depending on the
type of signaling-control protocol that is being used. There are a variety of signaling
protocols defined by the standard bodies Internet Engineering Task Force (IETF) and
International Telecommunication Union (ITU), which specify how the user can
setup signaling and bearer paths between the end devices. SIP signaling is based on
a collection of IETF standards.
Service features Specifications for the ONT
Voice quality Toll quality voice with a mean opinion score (MOS) of 4 or better
DC supervisory range Total dc supervisory range of 750 Ω, allowing for 1000 ft (305 m) of 26
AWG CAT3 cable, CPE equipment, and a margin allocation
G.168 echo
cancellation
16 ms tail for near-end echo
CODEC
(1)
G.711 (PCM 64 kb/s), G.729, and A-law and U-law encoding and decoding
Analog line
impedance
(1)
600 Ω
Ringing voltage
(1)
minimum of 40 Vrms
Ringing capacity 5 REN (US) per POTS line
(2)
Off-hook dc current
(1)
25 mA
Maximum expected
DTMF signal level
0.0 dBm
Receive (D/A) loss
(1)
4 dB
Transmit (A/D) loss
(1)
2 dB
Loop start signaling —
Loop length Up to 984 ft (300 m)
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