Ericsson SOLUTION DESCRIPTION EDA 1200 4.0 - Manual (Page 15)

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It is, of course, also possible to use flexible topologies
when adding VDSL2 to an already existing site with
ECN330. With EDA 1200 there is always an efficient
upgrade path at hand when introducing new
technologies and solutions. Transport
Ethernet over SDH
Operators with an Ethernet-based core network might
still have an existing Sonet/SDH-based infrastructure,
mostly to small and rural sites where the penetration of
bandwidth demanding services is not yet high. These
operators might wish to re-use spare capacity in the
Sonet/SDH infrastructure to carry Ethernet frames. The
Fast Ethernet to E1/T1 converter EXN104 makes this
possible. Other products covering the range of different
Sonet/SDH E3 and STM-1 interfaces are also available
from Ericsson.
Fast Ethernet to E1/T1 converter
EDA provides a cost-effective solution for transporting
Ethernet traffic via vacant E1/T1 lines, which is useful on
small sites. The stand-alone design of the IP DSLAM
removes the need for a back plane and subrack and
sets new standards for scalability and costs. This is
made possible by using the small, managed Fast
Ethernet to 4xE1/T1 converter (EXN104). A small Power
over Ethernet Node (EPN102) is available for power
feeding of both the IP DSLAM (EDN312x) and the
EXN104. All products provide a small scale ADSL
solution for remote sites down to 12 lines.
The EXN104 is typically used in a back-to-back
configuration as shown in the illustration below. But
aggregation of a number of EXN104 E1/T1s into a single
STM-1 is also possible using the implemented Cisco
Framing variant.
EXN104 supports up to four 120 Ω E1/T1 ports each
with a speed of 2 Mbps. EXN104 conforms to ITU-T
G.703 on the LSA® interface and is fully manageable
via SNMP from PEM.