10 — ONT technical specifications
Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06 July 2008 10-13
3FE 51892 AAAA TCZZA Edition 01 ONT Product Information Manual
with multi-ADSL. The maximum bit rates supported depend on deployment, noise
environment, and Ethernet system restrictions. The high bit rate asymmetrical mode
can be used for high-bandwidth video service, while the symmetrical bit rate mode
can be used for business users or residential users who need symmetrical bit rate
access.
VDSL2 provides improved functionality and performance over VDSL, and is
expected to be more widely adopted by service providers worldwide. Improvements
over VDSL include increased bandwidth, line diagnostic enhancements, and the
ability to define profiles. Unlike multi-ADSL, where the LT unit converts the
Ethernet packets to ATM cells and passes them to its applique, the packets remain in
Ethernet packet format for VDSL2 services. This provides approximately 10%
improvement in achievable bandwidth by eliminating the Ethernet packet to ATM
cell conversion.
Table 10-18 lists the VDSL2 modes and related ITU-T standards supported on the
modular ONT and the LP MDU ONTs.
Table 10-18 ITU-T standards supported
10.7 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.
Table 10-19 lists the specifications supported for the DS1/E1 interface.
Table 10-19 DS1/E1 interface specifications
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.
Item Specification
DS1/E1 WAN interfaces Two RJ-48C ports configured for 100 Ω DS1, 120 Ω balanced E1,
or 75 Ω unbalanced E1. An external adapter is required for 75 Ω.
DS1/E1 CES over Ethernet layer 2
GPON
MEF-8 packetization as IETF PWE3 pseudo-wires
DS1 standards AT&T TR-6421; ITU-T Rec. G.703, G.704
Structured (fractional) and unstructured DS1
(1 of 2)
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