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STM-1/4 Subtended Rings
The STM-1 tributary modules of VCL100 STM-1/4
can act as SDH NEs completing the Subtended Rings, or LTE performing Line, Span or Ring
Switching as well as pass DCC. The modules are able to insert/drop traffic through the
switching matrix to any of the other tributary/aggregate cards. It is possible to connect
a mix of STM-1/4 rings through the VCL100 (STM-1 / STM-4).
Transparent LAN service
The VCL100 STM-1/4 ETC card is transparent to
all higher layer protocols and provides point-topoint connections between remote Ethernet
segments. The ETC is well suited for LAN interconnection services among geographically
dispersed corporate offices. Typical LAN interconnection solutions use expensive ATM
interfaces on routers to connect to SDH multiplexers. But the 10/100 Base-T interfaces on
the VCL100 STM-1/4 SDH node provide a much more cost-effective solution.
Conventional Solution using ATM
interfaces on Routers
Consider connecting 8 subscribers requesting
bandwidth of 6 Mbps each. Each router need 8 E3 interfaces for transporting this traffic
and this necessitates an STM-4 Backbone.
VCL100 STM-1/4 ETC Solution
In the VCL100 STM-1/4 based solution the
traffic from each of these Ethernet connections can be collected using a 10/100Base-T
interface on the routers and SDH nodes. The VCL100 STM-1/4 SDH node requires an
8x10/100Base-T ETC card and the traffic from these 8 different connections is flexibly
mapped, requiring only an STM-1 Backbone. In addition, upgrading from the existing
bandwidth is software-selectable resulting in cost savings in terms of interface cards and
operational expenses.
Integrated Voice and Data Network
In a typical Interconnect Service voice and
data traffic from multiple corporate offices need to be interconnected in a cost effective
manner. A conventional solution uses separate voice and data networks to carry this
traffic over separate fibers. Using the VCL100 STM-1/4, which provides both TDM and
Ethernet interfaces through the ETC, a service provider can carry both voice and data over
the same fiber pair using the same equipment.
Example: There is a need to provide data connectivity of 10 Mbps between two locations.
There is also a voice traffic requirement of 21E1s between the same two locations.
Consider two different distances between the two locations: 10 km and 50km.
Conventional Ethernet + SDH solution
In this scenario, data and voice are carried over different fiber pairs using Gigabit
Ethernet (GigE) for data and conventional SDH for voice (Figure 1). GigE LX/HX solution
can drive only up to 10 km. GigE ZX solution can provide 70 km spans but is expensive.
VCL100 STM-1/4 ETC solution
In this solution, data and voice are carried
over the same fiber pair by mapping the 10/100Base-T Ethernet traffic onto SDH. The
network is a linear STM-4 network, which can be optionally configured for 1+1 protection.
Longer distances can be achieved by using long haul lasers that are relatively much more
cost-effective.
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