Purpose of TDM
over Packet technology
Telecom companies and enterprise
users can save significant 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 Ethernet
optical fiber, or wireless Ethernet/IP networks.
TDM over Packet
(2 E1 Port
FE Version) equipment works
The E1 data streams received on the
E1 interfaces are converted by the E1oP engine of the
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
(2 E1 Port FE 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
1+1 Redundant Power Supplies, AC
and DC, or AC plus DC.
Redundant power supply inputs.
Extended Temperature Range: (-200C
EMI / EMC Complaint
Real Time battery backed clock with
life in excess of 10 Years
Power over Ethernet (PoE) -
E1 Clock recovery and
Adaptive Clock Recovery (ACLK)
Recovered Clock (RCLK) / Loop-Timed
Asymmetrical (One-Clock and
Synchronization to an External
Synchronization to an Internal
Automatic clock priority selection
with fall back
Key Features - E1 and E1oP Interface
Supports 2 independent E1
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.
Absolute and Differential times
Jitter and Wander conforms to G.823
/ G.824 and G.8261 and TDM specifications.
Supports three E1 framing modes -
Framed, Unframed and Multi-framed with CAS signaling.
Supports IETF-PWE3 (pseudo-wire),
SAToP and CESoPSN transport mechanisms.
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 timeslots
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 network latency / packet
delay variation / jitter buffer of up to 512ms.
Supports IP, MPLS and MEF8 (Metro
120 ohms balanced E1 interfaces.
Optional 75 Ohms BNC interface (120 Ohms to 75 Ohms cables
E1 Loopback facility for testing
Features - Ethernet / IP Network Interface
Optical SFP based (10Base-FX)
and Electrical (100Base-T) Ethernet port and PoE options
4 x 10/100BaseT Copper
2 x 10/100BaseT Copper
Ports, 2 x 10/100BaseT Ports with PoE.
2 x 100BaseFX Optical
Fiber Ports, 2 x 10/100BaseT Copper Ports.
2 x 100BaseFX Optical
Fiber Ports, 2 x 10/100BaseT Ports with PoE.
Power over Ethernet (PoE)
(available options as above).
Meets and exceeds the Telcordia
GR-1089-CORE Lighting and Power Contact Protection requirements.
VTC Virtual Cable
tester on all PHY (Electrical Ethernet) Ports.
point-to-multipoint applications based on IP addressing.
Supports drop and
1+1 Ethernet Link
Redundancy (Hitless) Redundant Link Protection.
Supports QoS, 802.1p
based packet priority.
Port Control Egress
Mode (Tagged/ Un-Tagged/ Un-Modified) 802.1Q Mode.
User configurable MTU
(E1oP payload) packet size. May be configured from 1 to 1800
Switch supports jumbo
frame sizes of up to 2048 Bytes.
Port based and Tag
based VLANs Supports 1-4095 VLAN Ids.
Supports Ethernet rate
limiting on each port.
priority assignment (IP Diffserv / DSCP).
Key Features - System Management, Monitoring and Alarm Interfaces
External Alarm - Dry contact relay
alarms are also available at rear of the system to connect the
system to an external alarm.
NMS (Network Management System) to
monitor multiple units from single Central Location.
Supports system temperature
monitoring with High Temperature and Low Temperature alarms and
Supports SNMP V2 Monitoring and
UDP-specific “Special” Ethernet
In band VCCV ARP.
Self-test for checking system
errors upon system bootup.
Clock Performance Alarms.
Network Performance Alarms.
Network Performance Monitoring and
Online / remote upgrade of
OAM: Operation and Management Ports
System Access, Control and Management Options
CLI Control Interface
(HyperTerminal or VT100).
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 single
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 Switched Network