Purpose of TDM over
Telecom companies and enterprise users can
save network and equipment cost and generate additional revenue by
offering different types of services over a single packet-switched
infrastructure by the use of E1oP equipment. The
E1oP equipment is
also suitable for connecting to Ethernet / packet wireless equipment to
achieve fast deployment of E1 services over wireless Ethernet networks.
One particular application is to build E1 links with low cost Wireless LAN
bridges, replacing expensive TDM / E1 microwave radios.
The 2 x E1 over Ethernet (VCL-E1oP)
multiplexer may be used to provide legacy TDM services over Gigabit
Ethernet optical fiber, or wireless Ethernet/IP networks.
How the TDM
over Packet (2 E1 Port GE Version)
The E1 data streams received on the E1
interfaces are converted by the E1oP engine of the
E1oP equipment to
Ethernet data packets (of a fixed size) and transported over the Ethernet
network with UDP / IP, MEF or MPLS headers. At the receiving end the
E1oP reconstructs the original data streams by removing the IP, MEF or
MPLS headers and converts the Ethernet data packets back to E1 frames
using highly reliable and accurate clock recovery mechanism. The 'VCL-E1oP'
(2 E1 Port GE Version) offers the user a choice of standard, E1 to packet
and packet to E1 conversion mechanisms that include SAToP and CESoPSN
19-Inch rack mountable
1U form factor (44mm high)
1+1 Redundant Power Supplies, AC and DC, or
AC plus DC
Redundant power supply inputs
Extended Temperature Range: (-200
C to +600 C)
EMI / EMC Complaint
Real time battery backed clock with life in
excess of 10 years.
E1 Clock recovery and synchronization
Adaptive Clock Recovery (ACLK)
Recovered Clock (RCLK) / Loop-Timed Clock
Asymmetrical (One-Clock and Two-Clock) Clock
Synchronization to an External Clock (ECLK)
Synchronization to an Internal Clock
Automatic clock priority selection with fall
Key Features - E1 and E1oP Interface
independent E1 interfaces.
Internal, External, Adaptive, Recovered
clock and Asymmetrical (One-Clock and Two-Clock) options for the E1 TDM
port synchronization. Automatic clock priority selection with fall back.
Supports CESoPSN payload mechanism to
support the fractional E1 with data rate of 64Kbps to 2.048Mbps (DS0
timeslot level). User configurable data rate from 64kbps to 2048kbps, in
steps of 64kbps.
CESoPSN payload mechanism feature allows the
user to optimize the packet switched network by limiting its usage to
the corresponding number of time slots carried by an E1 channel.
Supports SAToP payload mechanism to
transport full E1 (transparent to the structure of the TDM frame useful
for transporting framed / unframed E1 channels).
Supports IETF-PWE3 (pseudo-wire), SAToP and
CESoPSN transport mechanisms.
Supports IP, MPLS and MEF8 (Metro Ethernet)
Supports three E1 framing modes - Framed,
Unframed and Multi-Framed with CAS signaling.
Supports point-to-point, point-to-multipoint
and drop and insert applications.
Supports network latency / packet delay
variation / jitter buffer of up to 512ms.
Absolute and Differential times tamps.
Jitter and Wander conforms to G.823 / G.824
and G.8261 and TDM specifications.
RJ45 - 120 ohms balanced E1 interfaces.
Optional 75 Ohms BNC interface (120 Ohms to 75 Ohms interface converter
E1 Local and Remote Loopback (RLOOP)
facility for testing and diagnostics.
Key Features - Ethernet / IP Network Interface
Switching Capacity upto 6 Gbps, non-blocking.
4 GigE Ports.
Optical SFP based (1000Base-FX) and
Electrical (10/100/1000Base-T) Ethernet port options.
Point-to-point and point-to-multipoint
applications based on IP addressing.
Supports drop and insert applications.
Port Control Ingress Rate Limiting.
1+1 Ethernet link redundancy
User configurable MTU (E1oP payload) packet
size up to 1800 Bytes.
Configurable payload size for each bundle.
Switch supports jumbo frame sizes of up to
Supports 802.1Q based QoS, 802.1p based
Based Priority (Classifying Services).
and 802.1Q / 802.1p based packet tagging and prioritization.
Control in an Ethernet Packet Networks (Regulating Traffic).
/ Customer based bandwidth allocation (Port Rate Limiting).
MEF and UDP tagging for Ethernet traffic.
Separate IP Address for TDM traffic and equipment management.
tagging for TDM traffic and equipment access / management.
Single / Double 802.1Q
VLAN tagging (Q in Q VLAN Tagging) - User configurable.
UDP-specific “Special” Ethernet type.
In band VCCV ARP.
Key Features explained
Priority (Classifying Services) - Port based Priority feature allows the
user to assign priority to the individual Ethernet ports, so that traffic
can be regulated according to the port on which that service is connected.
The user may also assign highest priority to TDM (E1/E3) traffic and
Ethernet services on a lower priority.
Priority (Classifying Services) - VLAN based Priority feature allows the
user to assign priorities to different VLANs carrying various types of
services / traffic according based on user categories and preferences. The
user may assign highest priority to TDM (E1/E3) traffic and Ethernet
services on a lower priority. User may also configure which TDM link
should be given preference over the other TDM links when the uplink
bandwidth falls below a particular threshold.
Flow Control in
an Ethernet Packet Networks (Regulating Traffic) - Flow Control feature
allows the user to regulate Ethernet traffic flow to minimize packet loss
due to data bursts.
Port / Customer
based bandwidth allocation (Port Rate Limiting) - Port based Ingress
Ethernet Rate Limiting allows the user to assign the bandwidth as per port
/ service requirements, in addition to provisioning traffic by using
802.1Q and 802.1p VLANs and packet priority.
Management, Monitoring and Alarm Interfaces
NMS (Network Management System) to monitor
multiple units from single Central Location.
External Alarm - Dry contact relay alarms
are also available at rear of the system to connect the system to an
Supports system temperature monitoring with
High Temperature threshold and Low Temperature threshold alarms and SNMP
Supports SNMP V2 Monitoring and Traps.
Self-test for checking system errors upon
Clock Performance Alarms.
Network Performance Alarms.
Network Performance Monitoring and
Online / remote upgrade of firmware.
System Access, Control and Management Options
CLI Control Interface (HyperTerminal or
SNMP V2 Traps (MIB File provided).
Windows based GUI (Graphical User Interface)
for easy configuration, management and access.
Ability to monitor multiple units from a
OAM: Operation and Management Ports
Application 1: E1oP in Cellular Backhaul.
Typical Application Diagram in Wireless Network.
Typical Application Diagram in Wireless Network
- 1+1 Link Redundancy.
Typical Application Diagram in Wired Network.
E1s and Gigabit Ethernet Traffic over a Packet