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STM-1 Terminal Multiplexer
In a terminal multiplexer configuration, only one STM-1
optical interface is used in an unprotected set up. This is the case when VCL100MC-1 is
either used as a spur or at the end of a linear segment. If 1+1 MSP is also provisioned,
an additional STM-1 optical interface is required on VCL100MC-1.
STM-1 Regenerator
VCL100MC-1 can be configured as regenerator for STM-1
interfaces without using any tributary slots. The receive clock shall be used in the
transmit direction.
Network Applications
STM-1 Rings with E1/E3 traffic
Transparent LAN service
The VCL100MC-1 ETC card is transparent to all higher layer
protocols and provides point-to-point 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 VCL100MC-1
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.
VCL100MC-1 ETC Solution
In the VCL100MC-1 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 VCL100MC-1 SDH node requires an 10/100Base-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 saving 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 VCL100MC-1 multi-service platform, 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 50 km.
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.
VCL100MC-1 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
SDH 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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