Alcatel-Lucent
1850 TSS-5 Transport
Service Switch
Modular Aggregation and Transport Unit
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The Alcatel-Lucent 1850 TSS Family
New bandwidth-hungry services, such as triple play and Ethernet virtual
private networks (VPNs), are placing great demands on the existing trans-
port infrastructure. To remain profitable, businesses and service providers are
embracing these new revenue-generating services by moving from circuit-based
transport, using TDM, to packet-based transport, using Ethernet.
The new-services introduction is probably the most critical factor to a
service provider’s success. The increasing demand for bandwidth for these
new services is not reflected in comparable increases in revenue, presenting a
significant business challenge. The Alcatel-Lucent 1850 TSS helps businesses
maximize their profitability by transporting any service mix while keeping
strict control of the costs.
The Alcatel-Lucent 1850 TSS is a family of multiservice packet-transport
products supporting any mix of traffic, from all-circuit to all-packet. With
these products, businesses and service providers can build highly flexible
networks that transition from circuit to packet transport gradually, as
packet capacity is required, but without disrupting existing traffic or
paying for expensive overlay networks. The 1850 TSS family optimizes
network efficiencies by aggregating native signals and allowing transport
of both packets and circuits.
Alcatel-Lucent 1850 TSS-5 Transport Service Switch
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Flexible and efficient aggregation and transport, meeting
the evolving needs of multiservice access networks.
1850 TSS-5: Where TDM
and Ethernet Services Coexist
The 1850 TSS-5 is a compact, modular, optical transport
switch with the functionality to carry TDM traffic from
1.544 Mb/s interface/2.048 Mb/s interface (T1/E1) to
optical channel level 12 (OC-12), and packet traffic from
10 Mb to Gigabit Ethernet (GigE). It is recommended for
use where TDM and Ethernet services coexist.
Less than 125 mm (5 in.) tall, the 1850 TSS-5’s small
footprint is designed to extend optical transport to the
customer premises. It is ideal for mobility backhaul
from the cell site and for fiber-to-the-business (FTTB)
and end-user-access applications. The 1850 TSS-5 is
environmentally hardened, making it suitable for
mounting in outdoor cabinets or at cell towers.
Pseudo-wire support of circuit emulation services (CES)
makes the 1850 TSS-5 ideal for cell-tower backhaul and
the smooth transition from TDM to third-generation
mobile system (3G) and fourth-generation mobile system
(4G) networks. It has small form-factor pluggable (SFP)
optics, allowing the optics to be purchased separately
from the circuit packs and plugged in when additional
interfaces are needed. This design lowers initial capital
expenditures (CAPEX), making the 1850 TSS-5 capacity
easily scalable.
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Alcatel-Lucent 1850 TSS-5 Transport Service Switch
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Multifunctional
necessary for private-line Ethernet
over synchronous optical network/
synchronous digital hierarchy
(SONET/SDH) links between two
end-points, typically just SONET/
SDH cross-connections. Standard
SONET/SDH loopbacks are also
supported, including terminal
loopback, facility loopback and
external optical loopback.
Even by today’s competitive stan-
dards, the 1850 TSS-5 is distinctly
versatile and multifunctional.
Fast Ethernet (FE) traffic can be
aggregated onto up to 4 GigE ports
and these ports can be electrical or
optical, depending on the available
or desired infrastructure. The 1850
TSS-5 supports carrier Ethernet
services such as point-to-point
Ethernet line (E-line) and virtual
Ethernet LAN (E-LAN) with robust,
standards-based quality of service
(QoS) and reliability.
The 1850 TSS-5 has several
cross-connect capabilities, offering
network designers greater flexibility
in directing traffic flow through
systems to support a wide variety
of customer applications using
two-way cross-connections. Where
a SONET/SDH ring is created,
protection switching is done
independently for each SONET/
SDH path. UPSR/SNCP rings
operate in an integrated, single-
ended fashion, eliminating the
need for complex, network-level
coordination in the effort to
The 1850 TSS-5 provides
high-speed optical transport for
OC-3 and OC-12 linear optical
extensions, while unidirectional
path switched ring/Subnetwork
Connection Protection (UPSR/
SNCP) switching can be used at
the synchronous transport signal
level 1 (STS-1), STS-3c and virtual
tributary (VT) 1.5 levels. Further,
only minimal provisioning is
restore traffic.
Alcatel-Lucent 1850 TSS-5 Transport Service Switch
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Management and Performance Monitoring
Where required, the 1850 TSS-5 comes with a craft
interface terminal (CIT) that manages SONET/SDH
operations though a standard RS-232 or LAN port. A
full-featured graphical user interface (GUI) may be used
or, if preferred, transaction language 1 (TL1). Performance
monitoring is also provided and software upgrades can
be downloaded by FTP without a truck roll.
Various other functionalities such as Address Resolution
Protocol (ARP) and Internet Protocol (IP) tunneling are
also supported. For example, Proxy ARP support on
the Gateway Network Element (GNE) eliminates the
need to create static routes for routing the IP packets
from the access network to the embedded network.
Alternatively, customers can choose the Simple Network
Management Protocol (SNMP), if preferred.
Common Applications
• Wireless backhaul using Ethernet or SONET/SDH
• Enterprise access using Ethernet aggregation into GigE
• Enterprise access using digital signal level 1 (DS1)/E1 and GigE over SONET/SDH
• Ethernet extension within an existing building or campus
• Private line and private LAN services and LAN interconnect
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Versatile Applications
Mobility Backhaul
The 1850 TSS-5 supports backhaul for all wireless technologies, including:
• Code Division Multiple Access (CDMA)
• Global System for Mobile Communications/Universal Mobile Telecommunications
System (GSM/UMTS)
• Wideband Code Division Multiple Access (W-CDMA)
• Worldwide Interoperability for Microwave Access (WiMAX)
Mobility second-generation mobile system (2G) and 3G traffic is accommodated using Ethernet or
SONET/SDH transport. In addition, its aggregation capabilities allow the 1850 TSS-5 to backhaul
multiple parallel networks simultaneously. With a SONET/SDH network, TDM traffic is carried
in native mode and Ethernet is carried by industry-proven Ethernet over SONET/SDH (EoS).
As mobility traffic and applications become increasingly data and IP oriented, Ethernet backhaul
networks become more attractive. The 1850 TSS-5 offers feature-rich Ethernet services of up to
GigE. (see Figure 1).
Figure 1. Mobile Backhaul
Hub/Large Cell-Site
Aggregation
BTS/Node B
T1/E1
BTS/Node B
T1/E1 (Native and CES/PW),
Ethernet
1850 TSS-5
Hybrid Optical/
Packet Aggregation
Hybrid Optical/
Packet Access
1850 TSS-320
BSC/RNC
BTS/Node B
Cell Site
1850 TSS-5
1850 TSS-15/100
MTSO Aggregation
Alcatel-Lucent 1850 TSS-5 Transport Service Switch
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The 1850 TSS-5 supports graceful migration from
TDM 2G services to fast-growing Ethernet- and
data-oriented 3G services. With Ethernet back-
haul, the 1850 TSS-5 supports TDM traffic by
CES. In CES, TDM is transported over Ethernet
by static multiprotocol label switching (MPLS)
pseudo-wires protected by bidirectional forwarding
detection (BFD), a form of label switched path
(LSP) protection.
backhaul as packet traffic grows, transitioning
from TDM backhaul to Ethernet backhaul on the
same platform, where and when it makes sense.
Enterprise Services
The 1850 TSS-5 provides a low-cost solution for
offering high-speed access to small and medium-
sized enterprises. The 1850 TSS-5 provides
businesses and service providers with reliable
transport for both voice and data service. Figure 2
shows the 1850 TSS-5 placed in various buildings
with diverse multitenant units. Separate users have
distinct voice and data requirements, needing a
mix of DS1/E1 and Ethernet connections.
By using the 1850 TSS-5, businesses avoid making
a premature SONET/SDH or Ethernet backhaul
decision. They can start with SONET/SDH
backhaul networks and move to Ethernet
Figure 2. Enterprise Access
1850 TSS-5 provides:
• DS1/E1
GigE
• 10/100 Mb Ethernet
1850 TSS-5
1850 TSS-5
1665
DMXtend
1665
DMXplore
OC-3/
STM-1
1665
DMXtend
1665
DMX
OC-12/
STM-4
1850 TSS-5
OC-3/
STM-1
1850 TSS-5
OC-192/STM-64
1850 TSS-320/100
1665
DMX
MetroCore
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Alcatel-Lucent 1850 TSS-5 Transport Service Switch
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For enterprise services, the advantages of installing the 1850 TSS-5 include:
• Saves space, courtesy of the small footprint and avoiding the use of separate data switches
• Uses low-cost fiber terminations at the customer site
• Supports a variety of connection types and speeds, offering service flexibility
• Offers remote operations and monitoring from the central office (CO)
• Provides SONET/SDH-based protection for both voice and data
Figure 3 illustrates a low-cost solution for bringing high-speed access to small
enterprise customers, using DS1/E1 and EoS-protected OC-3 or OC-12 lines,
and aggregating Ethernet connections for transport over FE and GigE.
The 1850 TSS-5 collects traffic from the multiple sources within the building,
aggregates them together and then transmits the aggregated traffic by
SONET/SDH or Ethernet to basement-located customer premises equipment
(CPE) or even directly to the CO.
In this application, the 1850 TSS-5 again excels due to its small footprint and
its support of both TDM and packet. Within the building it supports greater
use of fiber, as opposed to copper, and enables EoS services such as virtual
LAN (VLAN) and Ethernet private lines. In addition, the 1850 TSS-5
supports both electrical and optical Ethernet interfaces, greatly increasing
network-design flexibility.
Figure 3. Ethernet Extension
Metro CO/PoP
1850 TSS-5
OC-12/
GigE
STM-4
MPLS
1850 TSS-5
OC-48/STM-16
1665
DMXtend
1850 TSS-100/15
Alcatel-Lucent 1850 TSS-5 Transport Service Switch
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Transition to the Future
The 1850 TSS-5 is a compact, feature-rich network element, small
enough and with sufficient environmental hardening to operate in
hostile environments such as cell sites, and in virtually any CPE
situation. It is designed for the aggregation and transport of multiple
types of traffic by the most cost-effective means possible, offering
service providers and businesses an easy and affordable way
to migrate from existing legacy architectures to service-enabled,
packet-based architectures.
10 Alcatel-Lucent 1850 TSS-5 Transport Service Switch
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Recognized World Leader
in Optical Networking
Alcatel-Lucent delivers end-to-end communications solutions to service
providers and enterprises anywhere in the world. Leveraging its network
equipment as well as services, Alcatel-Lucent facilitates its customers’ service
offerings and revenue streams. As the recognized world leader in optical
networking, Alcatel-Lucent is in a unique position to help service providers
navigate through current market conditions. Alcatel-Lucent, with its global
reach and scale, combined with local presence in over 130 countries, makes
use of a deep understanding of global-market dynamics, as well as the ability
to anticipate local requirements.
Visit the Alcatel-Lucent web site at alcatel-lucent.com.
Alcatel-Lucent 1850 TSS-5 Transport Service Switch 11
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trademarks are the property of their respective owners. The information presented is subject to change
without notice. Alcatel-Lucent assumes no responsibility for inaccuracies contained herein.
© 2008 Alcatel-Lucent. All rights reserved. WLN2468071138 (02)
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