The system may be configured as an STM-1 add drop
multiplexer (ADM) with a termination capacity of up to
112 x 2 Mb drop for metropolitan networks or as an STM-4
multiservice terminal multiplexer with 2 x STM-1 and
8 x E/FE interfaces, used to link several large offices to
an enterprise network.
The Alcatel 1642 EM has a symmetrical architecture,
allowing its application as terminal multiplexer, add-drop
or mini cross-connect in spur, multiple rings or meshed
topologies. All traffic ports (PDH, Ethernet or SDH) of
the same type have the same functionality and behavior
and there is no inherent split between tributaries and
aggregates.
The Alcatel 1642 EM’s resiliency makes it ideal as a
multiservice transport node. In terms of hardware, the
Alcatel 1642 EM has a centralized control architecture
that limits the presence of processors and software to
the compact ADM-1/4 card. Traffic ports have no on-
board processors and may be reused from one piece of
equipment to another, or retrieved from stocks without
concern about software versions. The Alcatel 1642 EM
also offers local and remote software downloads. In addi-
tion, service providers can also monitor subnets formed
by the Alcatel 1642 EM, even in multivendor networks.
Whether in telecommunications-office environments or
at enterprise locations, the Alcatel 1642 EM has the right
powering solution (DC or AC) and optional power
redundancy can provide equipment protection.
Concerning traffic protection, sub-network connection
protection (SNCP) with drop-and-continue function is
provided for improved traffic availability, enabling the
Alcatel 1642 EM to be inserted directly into access rings
or to be connected to access rings via point-to-point,
unprotected or protected links. SNCP also enables end-
to-end protection of SDH paths. Dual hubbing to two
distinct central-office transport nodes is also possible,
e.g., via dual STM-4 uplinks.
The Alcatel 1642 EM paves the way to build unique
optical-network infrastructures, supporting optimized
transport and integrated networking functions for data
applications, such as new Ethernet VPN services.
The Alcatel OMSN family consolidates the vast expe-
rience gathered by Alcatel in optical-network architectures
through hundreds of thousands of installations world-
wide. That’s also where true reliability comes from.
Alcatel 1642 Edge Multiplexer — 155-to-622-Mbit/s Alcatel OMSN for customer premises & public/private companies
A L C AT E L
>
3
Figure 2 - The Alcatel 1642 EMUS in Mission-Critical Communications
Public/Private Companies
TV Studio
Office LAN
SONET/SDH
Metro Transport
CPE/Metro Access
MAN - WAN
LAN/LAN-extension
Always-on Mission-Critical Communications
E1
FE/GE
2Mbps
34/45 Mbps
Bridge/Tunnel Highway
Passenger Terminal Substation
Station
Production
and Distribution
Control Systems
Power
Generation
Line Side Signal
Post Telephone
Interlocking
Equipment
MUX
Storage
Telephony
Video
Surveillance
CCTV
Emergency
Call Point
Display
Panels
Ticket
Terminal
CCTV
Video-
conferencing
RTU
TPR
Meter
Voice
SCADA
Data
OMSN
OMSN
Power Utility
Oil and Gas
Railway
Airport
Highway/Underground
Government
Cable and TV Broadcaster
Enterprise
Corporate
OMSN
OMSN
Ethernet
10/100
1642 EM
1642 EM
1642 EM
1642 EM
