VCL-4 Ethernet over E1
Telecom Networks Inc. offers the VCL-4 Ethernet over E1 Converter
provides the user with an option to transport Ethernet (multiple
LANs) over an E1 link. The equipment converts and transports upto 4
x Ethernet links over an E1 in a shared* mode or a discreet* mode,
depending on the users preference and selection.
In the shared* mode (please see application diagram below) all 4
Ethernet channels are transported over the same shared E1 link
and are allowed full access to each other’s path. The user may
select this mode if the user desires that all of the 4 x
Ethernet links that are being transported over the same E1 to
optimally share its bandwidth resources and where discretion is
In the discreet* mode
(please see application diagram below) all 4 Ethernet channels are
transported over the same E1 link without intrusion or access to
each others path without any sharing. The user may select this mode
if the user desires that all of the 4 x Ethernet links that are
being transported over the same E1 to maintain discretion without
allowing access to each other.
The equipment shall
always be installed and used in pairs, with one terminal being
installed at either end (each side) of the network.
The VCL-4 Ethernet over
E1, E1/4*10(100)Base-T Interface Converter is an ethernet extension
device utilizing TDM telecom infrastructure (the telecom network of
E1s, or of PDH, SDH and E1/E3/SDH microwave etc. carrying E1s).
The VCL-4 Ethernet over
E1, E1/4*10(100)Base-T Interface Converter converts the Ethernet
Data into E1 frame format for transmission over the existing TDM
(E1) links and then reconverts the E1s back into Ethernet Data at
the far-end terminal. It function is to primarily provide a BRIDGE
between two Ethernet LANs over the existing E1 based telecom
The device can
effectively utilize the redundant bandwidth of telecom operators’
existing TDM network to transport Ethernet data with low investment.
This equipment may be
used for the following purposes:
Bridging Ethernet LANs
over existing TDM (E1) telecom network.
Networks utilizing TDM (E1) landline based telecom infrastructure.
Using telecom network
of E1s / PDH / SDH Microwave etc. carrying E1s to transport
In all these cases the
equipment be always installed and used in pairs, with one terminal
being installed at either end (each side) of the network
Typical Application 1
Shared Link Mode
In the “shared link
mode”, each LAN can view and talk to other LANs. Example: each
LAN can view and talk to all other LANs at same site or the
corresponding remote side. This mode may be selected for use if
bandwidth optimization and usage is of prime importance and the user
is not averse to sharing the E1 link resources with the other LANs
being transported on the same E1 link.
In the “shared link mode”, the VLAN
switch must be OFF (The ethernet ports are not isolated to each
other on both sides of the E1 link. Please refer to page 6 for VLAN
Discrete Link Mode
In the “discrete link
mode” each LAN is bridged to, and can only talk to its
corresponding LAN on the remote side. It can not talk to any other
LAN either at same side or the remote side. This mode may be
selected for use if the users do not wish to share the E1 link
resources with the other LANs being transported on the same E1 link.
Example: In the
discrete link mode, the LAN 1 (Ethernet Port 1 of the equipment)
only can talk to the corresponding LAN 1 (Ethernet Port 1 of the
equipment) at remote side and can not talk to any other LAN, either
on remote side or same side.