xdm 3000 the way to grow
Post on 24-Dec-2015
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DESCRIPTIONthiết bị XDM 3000 của ECI
Your Path for
XDM-3000: The Way to Grow
Your Partner for Growth
Highest capacity MSPP with full Low Order (LO) VC-12 connectivity
Converged support of TDM and carrier class Ethernet services
Built-in ASON/GMPLS for enhanced protection and resilience
Integrated high-capacity MSPP and DXC
Topology agnostic enabling mesh, ring, multi-ring, star, and point-to-point topologies
TDM Is Going Wild
The technology trend for transport network evolution is an all-IP network over Next Generation
(NG ) Optics (WDM, ROADM, OTN). This development is driven by strict requirements to lower the
Total Cost of Ownership (TCO) while handling the growing portion of data traffic over transport
However, it seems that technology trends do not always match traffic patterns nor suggest the
most cost-effective solution. In many cases, current networks need immediate ways to add more
capacity to cope with the growing subscriber base and added traffic, most of which is TDM-based.
One example for such growth can be found in 2G mobile networks in emerging markets, where
traffic growth is driven by two main catalysts:
TDM voice traffic
2G mobile operators are facing massive growth of their customer base with the main use being
plain voice traffic. In many cases, fixed line infrastructure is not available and mobile is the only
means of communication. In India and Africa for example, millions of new mobile subscribers are
added every month. This pattern is expected to continue for years, before saturation is achieved,
and service providers are having a hard time keeping up with it.
Data traffic over TDM-based infrastructure
Another catalyst driving the need for more TDM is the growth in data traffic. As data traffic
increases, service providers want to upgrade their networks to Ethernet/IP-based transport
equipment. The main question is - when and how? Installing an immediate overlay data network
from access to core entails a huge CAPEX outlay. Taking into account that the lion's share of
revenues will still be based on voice calls, providers may prefer to wait until data traffic hits a
It is becoming more and more obvious that using existing infrastructure to offer new data services
is the most cost-effective approach, resulting in the least risk and a lower TCO. These service
providers require the addition of SDH/SONET-based equipment in order to support the growth
in data traffic. ECI supports this approach by introducing an Ethernet MPLS over TDM-based
infrastructure within the entire BroadGate and XDM MSPP product lines.
As a result of the increased growth in TDM-based traffic (whether forpure voice TDM or
Ethernet services carried over TDM), congestion and bottlenecks are starting to proliferate at the
metro-core, where major aggregation points are located, and at central points such as central
offices, where greater LO switching capability is required.
When addressing these issues, service providers must evaluate their alternatives, looking for
the one solution that can support current needs, but also be future-proof and scale up to future
demands without requiring a forklift upgrade.
Transport networks are aimed to serve end-user applications, which are becoming more and
more IP-based. In general, the application and the end user are agnostic to the type of transport
network carrying the service as long as it fulfills their requirements. However, for critical mission
data applications, there are users that insist that their service is carried over a proven and reliable
MSPP-based transport network.
The operators debate as to which transport technology to use revolves around network status,
new service take off, required investments vs. expected revenues, and TCO.
Using the 2G network equipment example again, the starting point is a huge installed base of TDM
equipment from access to core. This includes PDH radio equipment, small and large MSPPs with
SDH/SONET, cross connects, etc. There is no economic justification for replacing this equipment
as long as it can support the required needs in terms of services and capacity. Thus, we expect
to see TDM-based transport networks for many years to come. When and where packet-based
traffic becomes dominant, appropriate solutions will be introduced, such as offloading data traffic
to another network or laying a new network alongside the existing one.
But higher capacity is not the only issue that needs to be addressed. While heavy traffic loads can
be handled with wider transport pipes, there is also a need to maintain LO switching granularity.
TDM-based services such as voice calls use 2 Mbps as their basic rate. In addition, Ethernet
services carried over SDH/SONET would benefit from low granularity because service costs can
be matched accordingly. Therefore, a total solution for handling the increase in TDM traffic must
support high capacity, wide transport pipes, and a large LO switching matrix.
Next Gen TDM-Intensive Network Scenario
MSPP at Your Service
Using higher-capacity MSPP with carrier class data capabilities to relieve traffic congestion is
the most cost-efficient solution available today, offering the lowest TCO and assuring a rapid
Return on Investment (ROI). Congested sites are upgraded on a per-site basis while the network
structure is preserved. No training is needed, nor a learning curve for the introduction of new
technologies and equipment, and the result is still a single network to maintain and manage. Not
only does it provide the most cost-effective solution for increased TDM traffic, but the support of
MPLS Ethernet and EoSDH also guarantee future-proof support of carrier class Ethernet services.
Regarding CAPEX, the price discrepancy between TDM and packet-based equipment is narrowing.
The cost of the latest SDH/SONET equipment with Ethernet functions has been decreasing rather
quickly over the past few years. Simultaneously, the addition of carrier class features (to meet
carrier-grade reliability requirements, for example) to Ethernet-based equipment has raised its
cost, compared to the corresponding equipment used for LAN networks.
It is important to note that investments in higher-capacity MSPP equipment is by no means due to
compromise. On the contrary, they are right in line with the migration path towards packet-based
networks. This approach does not delay the introduction of new services and, in fact, brings it
faster to the end user. Its main benefit, beyond the abovementioned, is giving the service provider
control over the pace of migration, without the pressures of introducing new services.
The LO Switching Advantage
Often, as the switching capacity of the MSPP becomes higher, so too does the switching granularity.
In other words, high-capacity MSPPs tend to switch traffic at higher levels like VC-4. When dealing
with networks where the basic service rate is 2 Mbps (voice calls, for example), the switching
granularity becomes an issue of concern. If the MSPP is unable to support the required level of
connectivity or the LO switching matrix exceeds its capacity, an additional piece of equipment is
needed to complement the required functionality. Besides the extra cost involved, this solution
consumes both I/O slots and High Order (HO) switching matrix capacity, thus reducing the net
total switching capacity of the solution and eliminating its non-blocking capability.
Full LO connectivity is vital, not only for TDM-based services but also for data services carried over
SDH/SONET. Being able to set a service at 2 Mbps granularity instead of being linked to the HO
switching granularity is greatly advantageous, allowing the service provider to offer differentiated
services with competitive pricing.
A full LO connectivity high-capacity MSPP saves on TCO, simplifies network design and operation,
and supports new revenue-generating services.
The following is a comparison of the XDM-3000 with other MSPPs for the handling of LO switching
of 100 Gbps and HO switching of 20 Gbps:
Stages XDM-3000 240 Gbps Fully LO/HOOther MSPPs
320 Gbps (240 HO + 80 LO)Start No Traffic 240 Gbps 320 Gbps+ 80 Gbps of LO connectivity No problem with room to grow
No problem; however, LO matrix full with no room to grow
+ 20 Gbps of HO connectivity No problem with room to grow No problem with room to grow
+ 20 Gbps of LO connectivity No problem with room to grow
Additional drop shelf and I/O cards required (4 x STM-64 or 16 x STM-16 to provide connectivity and protection between HO MSPP and LO drop shelf)
End - Handling 120 Gbps (100 Gbps switched at LO and 20 Gbps switched at HO)
120 Gbps used
160 Gbps used
Extra equipment required
XDM-3000 vs. Other MSPPs
Capacity Handling that Grows on You
The XDM-3000 is targeted to handle the bottlenecks in the metro-core network, enabling
cost effective network growth. As a member of the well-proven XDM-1000 family, it offers
best-of-breed SDH capabilities, yet supports advanced carrier Ethernet-based MPLS services.
As such, it is positioned to handle growing traffic requirements for both pure TDM and