Alcatel-Lucent 7330 Product Information Manual page 88

3 — ONT and MDU general and interface technical specifications
In adaptive timing, a local, free-running 25 MHz clock is used. The generated bit rate
is determined by the long-term average data rate. The attached DS1/E1 equipment
must be loop timed. In differential timing, a 16.384 MHz reference clock is
synchronized to the PON. Both ends of the DS1/E1 CES PW must use the same
reference clock frequency and be synchronized to a common source. RTP is used to
transport the transmit bit rate information. The DS1 or E1 equipment that is attached
to the terminating CES PW devices must be loop timed. In loop timing, the receive
clock rate is used for the transmit clock rate. The DS1/E1 equipment that is attached
must be source timed, not loop timed.
Timestamps within the MEF-8 packets are used for carrying timing information
across the network. Timestamp values are generated in differential format when the
interface is operating in differential timing reference mode. Otherwise, the
timestamp values represent absolute time.
3.7 RF video interface specifications for video overlay
The following section provides design guidelines for coaxial connectivity,
configuration recommendations, and information based on the RF video receiver
types used by Alcatel-Lucent ONTs and MDUs.
Video overlay overview
The system can provide RF video service through the video overlay function. The
function operates downstream in the 1550 nm optical band. Signals sent over the
overlay network are presented to the subscriber as RF signals from a video F-type
connector in the ONT.
The V-OLT supports the full cable television (CATV) spectrum from 47 MHz to 862
MHz.
3-12
Warning —
Operating equipment outside of its tested and
documented performance characteristics and causing an optical
overload may cause damage to equipment components, such as APD
receivers. This can affect service delivery, and void any component or
system warranties.
Note 1 —
V-OLT is an optional network equipment that is used to
distribute Radio Frequency (RF) video signal from service providers
to the ONTs. This equipment is not part of the OLT or ONT system.
The following description of the V-OLT function is provided for
informational purposes.
Note 2 —
Alcatel-Lucent only guarantees ONT RF video output
levels. Coaxial cable and splitter information in the following sections
are provided as guidelines. See the coaxial and splitter vendor
documentation for more information.
Caution —
Video subscribers can only be provisioned on the
7342 ISAM FTTU system platform.
December 2010
ONT Product Information Guide Edition 01
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.41
3FE 54017 AAAA TCZZA