Clocking, Network Synchronization, And Time Calibration For Ces; B-0404-A Standards Compliance - Alcatel-Lucent 7302 Information Manual

8 — B-0404-A unit data sheet
The CES IWF packetizes DS1 or E1 traffic received at the RJ-48C port before it is
multiplexed with other Ethernet layer 2 data packets for transport upstream on the
GPON. MEF-8 is the packet payload format used. The packetization is removed
before downstream DS1 or E1 traffic from the GPON is sent to the DS1 or E1 lines
at the subscriber side.
The B-0404-A also supports connections for E1 services. The CES IWF interface
provides MEF-8 packetization of E1 traffic from the E1/T1 interface, which provides
four RJ-48C ports. Figure
diagram.
GPON

Clocking, network synchronization, and time calibration for CES

The B-0404-A can use one of two clocking sources for CES: a derived GPON clock
or a local oscillator. When the system clock for CES is derived from the GPON, the
upstream P-OLT locks to the BIT clock and supplies the ONT with an Ethernet clock
that is traceable to a network timing reference. The supplied Ethernet clock is used
for differential clock recovery and for timing the upstream pseudo-wire MEF-8
packet streams in the absence of a valid TDM recovery clock. The local oscillator is
only used if adaptive mode is selected.
The downstream TDM streams may be timed from one of two clocking sources: an
adaptive clock received from the MEF-8 packet stream, or a differential clock
recovered from the MEF-8 packet stream.
The B-0404-A calibrates its time of day from a series of network time protocol
(NTP) servers. The ONT communicates with the NTP servers using the NTP
protocol and authenticate NTP servers with a provisionable security key. During a
loss of service (LOS) state on the GPON interface, a minimum 32 ppm clock is
maintained.
8.10

B-0404-A standards compliance

The B-0404-A business ONT is compliant with the following standards:
•
802.3 support for four configurable 10/100/1000BASE-T Ethernet interfaces
•
G.984.3 support for dynamic bandwidth reporting
•
G.984.3 support for AES with operator enable/disable on per port-ID level
•
G.984.3 support for FEC in both upstream and downstream directions
8-8 November 2013
8-3 shows the B-0404-A business ONT functional block
Figure 8-3 B-0404-A functional blocks
Power
Converter
Diplexer SOC
Alcatel-Lucent 7302 ISAM | 7330 ISAM FTTN | 7360 ISAM FX ONT R04.06.02
Ethernet (4)
CES
E1/ET (4)
IWF
Edition 01 3FE 55873 AAAA TCZZA
ONT Product Information Guide
RJ-45
RJ-48C
20164