Services from E1, E3, STM-1, STM-4
VCL100 STM-1/4 (upto 252 E1)
and Ethernet over SDH
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 supply card.
This TMUX 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
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
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
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).
The VCL100 STM-1/4
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 VCL100 STM-1/4 SDH node provide
a much more cost-effective solution.
Solution using ATM interfaces on Routers
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
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
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
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
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.