Alcatel-Lucent 7330 - Table 3-5 ITU-T Standards Supported

3 — ONT and MDU general and interface technical specifications
3-10 March 2011 Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.42a
ONT Product Information Guide Edition 01 3FE 54199 AAAA TCZZA
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 3-5 describes ITU-T standards and related VDSL2 modes supported on the
MDUs.
Table 3-5 ITU-T standards supported
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.
CES encapsulation is a method of carrying TDM traffic in an Ethernet frame so that
there is minimal loss of quality. The ISAM performs CES on the TDM traffic
received at the ONT DS1 or E1 port using the MEF-8 payload structure for transport
as Ethernet layer 2 packets over pseudo-wires (PW). The TDM payload within the
MEF-8 packet, whether it is structured or unstructured, is treated as a bit stream. The
MEF-8 packets are multiplexed along with other Ethernet layer 2 data packets at the
ONT before being transported across the GPON.
In unstructured mode, the payload size is fixed at eight DS0 frames per MEF-8
packet. For DS1, the payload length is fixed at 192 bytes per frame. For E1, the
payload length is fixed at 256 bytes per frame. In structured mode, the payload length
is determined from the encapsulation delay setting.
Table 3-6 lists the specifications supported for the DS1/E1 interface.
Standard Description
G.993.2 VDSL2 over POTS operating above the POTS 25 kHz band with trellis
G.994.1 Handshake procedures for DSL transceivers