Alcatel-Lucent 7330 Product Information Manual page 85

Synchronization
A bandplan is a partitioning of the frequency spectrum into non-overlapping
frequency bands, each of which is allocated for either upstream or downstream
transmission. ANSI and ETSI define a set of predefined VDSL BandPlan modes of
operation. The VDSL BandPlan shall be configurable on a per port basis. The
following bandplans are supported:
•
bandPlanAnnexA998 17A, 30A
•
bandPlanAnnexB998ADE 17a, 30a
•
bandPlanAnnexB998E 17a, 30a
Table
MDUs.
Standard
G.993.2
G.994.1
3.6 DS1/E1 interface specifications
The business ONT supports structured, unstructured, and fractional DS1 (100 Ω) or
E1 (120 Ω/75 Ω) services. An external adapter is required for 75 Ω. You cannot mix
DS1 and E1 services on the same ONT. You must configure both ports for either DS1
or E1 on the same ONT.
The CES subsystem encapsulates DS1 or E1 traffic received at the RJ-48C port using
MEF-8 packetization as Ethernet layer 2 for transport across the GPON. The CES
encapsulation is removed before DS1 or E1 traffic from the GPON is sent to the DS1
or E1 lines at the subscriber side.
Structured DS1 or E1 services emulate fractional services where the 1.544 Mb/s
DS1, or 2.048 Mb/s E1, bandwidth is subdivided in to DS0 64 kb/s channels.
Framing is used to group together multiple DS0s when the service is structured or
fractional. Unstructured services treat the full bandwidth of a DS1 or E1 link as
though it were one large channel, ignoring any framing.
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.41
3FE 54017 AAAA TCZZA
3 — ONT and MDU general and interface technical specifications
Figure 3-1 VDSL Termination Points
Data
VTU-O
signals
signals
OAM
3-4 describes ITU-T standards and related VDSL2 modes supported on the
Table 3-4 ITU-T standards supported
Description
VDSL2 over POTS operating above the POTS 25 kHz band with trellis
Handshake procedures for DSL transceivers
December 2010
Edition 01 ONT Product Information Guide
Downstream
POTS
Upstream
splitter
Metallic
twisted pair
POTS signals POTS signals
to CO
POTS
splitter
Data
VTU-R
signals
to CPE
21281
3-9