from E1, E3, STM-1, STM-4
STM-1/4 (upto 252 E1)
E1, E3 and
Ethernet over SDH
offers the ADM configuration can be achieved
using STM-1 card or STM-4 card, Cross-connect card, MIC, PSU and a
suitable combination of E1 / E3 / E4 / DS1 / DS3 / Ethernet
tributary cards. In case STM-1 aggregate card redundancy is
required, a second aggregate card can be used. For cross-connect
card redundancy, a second cross-connect card can be used. Power
supply redundancy can also be provided, by using a second power
MUX configuration can be
achieved with STM-1 card or STM-4 card, cross-connect card, MIC, PSU
and a suitable combination of E1 / E3 / E4 / DS1 / DS3 / Ethernet
tributary cards. For applications that do not require cross-connect
capability, a cross-connect bypass card can be used in the
cross-connect slot. Redundancy can be provided for processor card,
aggregate card, cross connect card and power supply card.
Stand-alone Cross Connects
In order to connect a
VCL100 STM-1/4 based ring to the backbone a minimum of 3 interfaces
are required on the node. For such applications, a cross connect
configuration is supported on VCL100 STM-1/4.
VCL100 STM-1/4 can be
configured as a regenerator for all STM-1/4 interfaces. This can be
achieved by having 1 aggregate card, 1 PSS1, 1 MIC and 1 PSU1 in the
system. The receive clock shall be used in the transmit direction.
Hence a separate card for supply timing will not be required.
VCL100 STM-1/4 is fully
compatible with other member of the VCL100 STM-1/ STM-4 family. It
can therefore be seamlessly used in an end-to-end network
configuration from the customer premises to the optical core.
The following figure shows a STM-4 network built using VCL100
STM-1/STM-4 with low drop requirements at a couple of locations.
These requirements can be cost-effectively addressed by using a
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
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
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.
Technical specifications are subject to
change without notice.
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