IP•Tube UNO E1

E1 Circuit Extension Over IP

- ROI Measured in Weeks -

- Exploits Efficiency of Ethernet -

Product Image


6" (L) x 4” (W) x 1.5” (H)


E1 Voice, Video and Data Over IP

The IPTube UNO E1 encapsulates a full or fractional E1 circuit into IP packets. E1 Over IP connections provide for the interconnection of PBXs, Cellular equipment and Telecom Switches via LANs, WANs, MANs, IP Satellite, xDSL, Cable and Wireless Ethernet.

Transparent Interconnect

The IPTube UNO E1's transparent operation maintains the proprietary signaling required to support PBX features such as call conferences, call forwarding, caller ID and SS7. Legacy phone equipment investment is preserved.

Signaling Support

PRI ISDN, SS7, ESF, D4, SLC-96, Proprietary out of band, and robbed bit signaling is supported. Transparent support for Data, Modem or Fax. Voice quality is not compromised.

The IPTube UNO E1 ships with one E1 interface and one 10/100 BaseT Ethernet Interface. Optional integrated 4 port QOS/VLAN/Rate Limiting Layer-2 Ethernet switch is available. 

An Ethernet Switch Option provides transparent LAN bridging, user data bandwidth and access control through rate limiting and port-based VLAN filtering and tagging.

Signaling Support Diagram

IP•Tube UNO E1 Standard Features

Assured Delivery Protocol

In order to assure high quality communications over links with intermittent or noisy performance, such as Wireless or Broadband over Power Line, the IPTube UNO E1 employs Engage’s robust Assured Delivery Protocol with the following benefits:

  • Packet out of sequence detection and re-sequencing
  • Lost packet retransmission with configured delay
  • Duplicate skipping

Dynamic Host Configuration Protocol - DHCP

The IPTube UNO E1  can be configured to obtain its Internet Protocol network parameters: IP Address, Subnet Mask, Default Gateway, DNS; from a local DHCP server.

Domain Name Addressing

IPTube UNO E1  can be configured to use a Domain Name for the remote IPTube in place of a fixed IP address. Supports mobile multi service provider installations with ease.

Dynamic DNS

IPTubes can be configured to register their IP address with Dynamic Domain Name Servers for discovery by the IPTube at the other end of the E1 circuit. DDNS support combined with DHCP make installations Name-based which is very easy to setup and maintain when compared to Static IP addressing.

Secure Socket Shell - SSH

Engage’s Secure Socket Shell, which is based upon industry proven Open SSH and FIPS 140 approved Open SSL version 2.0, provides secure encrypted communications between SSH clients such as OpenSSH, SecureCRT, and PuTTY and the IPTube’s Command Line Interface.


The IPTube UNO E1 is able to be fully managed with SNMP via standard and private MIBs. Large scale deployments of IPTubes with centralized management have made SNMP support a priority. SNMP Traps for error events enable proactive service fault isolation.

IP•Tube UNO E1 Optional Features

Ethernet Switch Option -SWITCH

The IPTube UNO E1 is available with a four port 10/100 Ethernet QoS switch integrating a high-performance switching fabric with four priority queues. Advanced features include 802.1p/IPv4/IPv6 traffic classification, full IEEE 802.1Q VLAN, RMON, SNMP, Port Monitoring and Layer 2 firewall. QoS determined by destination MAC address, port ID, IEEE 802.1p and multimedia traffic tags, IPv4 Type of Service (TOS), and Differentiated Services (DiffServ).

Rate Limiter

The Ethernet switch Ingress and/or Egress Rate Limiter option enables the reservation of the bandwidth for time-sensitive E1 Over IP real time connections. Required for applications where the LAN traffic can exceed the WAN bandwidth required by the E1 over IP/Ethernet application. The data rate limit range is 128 kilobits to 64 Megabits in binary increments.The Rate Limiter option limits the WAN bandwidth utilized by the LAN1 to LAN2 bridge. Rate Limiting the traffic enables the reservation of the WAN bandwidth for time the sensitive E1 Over IP real time connections. Great for Wireless WAN E1 applications. Rate Governing is only applied in the direction to the WAN to minimize latency.

Rate Limiter Diagram

Virtual Private Network Support

Interconnecting the IPTube UNO E1 through a Virtual Private Network with sufficient real time committed information rate ensures that the required quality of service is provisioned. The second Ethernet interface provides a management port. Each LAN interface features independent IP network configurations.

Protector Option -PRO

The protector option utilizes the Ethernet Switch port ETH1 as a redundant path for the interconnection of the IP encapsulated E1 data. The PRO Option is configured to Always-On, or with Switch-Over criteria.

Protector Option Diagram

Alternator Load Balancing Option -ALT

The Alternator option alternatively sends the IP packetized E1 frames on two Ethernet interfaces, balancing the load. The Alternator option enables fractional and full E1 circuits to be split over two IP WAN connections such as ADSL.

Full E1 Connection Across Two ADSL Lines

The IPTube UNO E1’s two Ethernet interfaces are able utilize two ADSL Ethernet Modems, that have opposite high speed direction, to transport a E1’s symmetrical bandwidth.

DS0 Timeslot Multiplexor Option -MUX

The IPTube UNO E1-MUX maps DSOs from a central site to as many as 24 remote locations via an IP/Ethernet connection. Get maximum use of expensive DS1 interfaces on PBX, Channel equipment and datacom gear. Also provides Virtual DACS Over IP capability. Mesh DS0s one-to-many or many-to-many.

MUX Diagram

Lossless Data Compression OPTION- C

The IPTube UNO E1-C continuously detects idle and redundant data within each E1 Voice circuit resulting in as much as a 40 to 1 bandwidth savings.

TDM over IP WAN bandwidth is not consumed by silent or redundant circuits.

Pay-As-You-Grow Field Upgrades

The IPTube UNO E1s are designed for Pay-As-You-Go growth. Field Upgrade benefits are extended to our Industry-Best Loss less Data Compression. Loss less Data Compression can be upgraded with a simple software-based license key installation. If you determine that your IPTube UNO E1 is best deployed with Lossless Data Compression, your still in business with a field upgrade!

Rack Mount Kit

The IPTube family is ready for your most demanding central office or data center environments. With the Rack Mount Kit, IPTube products are easily installed in 19" and 23" racks. Easy access to both front and rear sides facilitates technician maintenance procedures.


E1 Over IP Ethernet Benefits

  • Transparent leased and private line services over less expensive IP and Ethernet networks

  • Protects investment in traditional telephony and TDM equipment.

  • Disaster recovery for E1 circuits with 1+1 and 1:1 redundancy.


  • Operating expenses are minimized by leveraging the efficiencies and ubiquity of IP, Ethernet and MPLS


  • Ethernet, IP and MPLS infrastructures are inexpensive, fast to provision and scalable.


  • Easy installation with IP-based management and carrier grade diagnostics.

E1 Private Line Services over IP

Multi-Site Enterprises, Cellular Service Providers, Education Districts, Universities, National, State and Local Government, and Municipalities incur significant recurring monthly costs for rigid-bandwidth leased lines used only for the interconnection of PBXs and Telecom switches.

The IPTube UNO E1 provides organizations with the ability to interconnect their existing phone systems over flexible bandwidth lines that are used to carry data, voice, and video. The Voice Only Leased Line Toll charges assessed by long distance and local carriers are eliminated or dramatically reduced by transporting voice traffic across LANs and WANs.


The most compelling option for the interconnection of E1 based systems is when it can be accomplished over a Local Area Network. The deployment of Fiber based LANS such as Gigabit Ethernet, provides organizations with high performance and high quality bandwidth that is especially well suited for the interconnection of PBXs and Telecom Switches.


Wide Area Networks that have sufficient bandwidth and Quality of Service provisioning result in very significant cost savings especially for Multinational Corporations.IPTube UNO E1 with loss less data compression, detects idle and redundant data within each voice circuit resulting in a 56 to 1 bandwidth savings. WAN bandwidth is not consumed by silence or redundant samples.

E1 Over Wireless Ethernet

Interconnection of E1 based data communication systems over wireless as a primary or back up connection is a major application of the IPTube.

For over eight years the IPTube has proven itself around the world as an effective method for using Commercial Off the Shelf Wireless Ethernet Bridges to interconnect E1 circuits.

The IPTube’s Assured Delivery Protocol has the sophistication required for solid performance across a wide range of wireless connections.

The use of parallel Wireless Ethernet links minimizes the latency and Radio’s packet processing requirement. 
Note: Parallel Application requires Ethernet Switch Option.

E1 Over Wireless Ethernet Diagram

Connecting phone systems across a wireless Ethernet connection has a return on investment that is measured in weeks. Eliminating the wired connection for the E1 based communication equipment is made possible with the IPTube’s E1 Over Ethernet capability.

Cellular Base Station Backhaul

IPTube UNO E1s provide transparent interconnection of Base Stations, Base Station Controllers and Mobile Switching Centers over IP Ethernet packet-switched networks.

Cellular service providers save substantially by converting to a packet switch network. The Lossless Data compression option, which is especially well suited to Cellular communication links, minimizes the bandwidth required to interconnect.

Cellular phone service providers are able to save substantially by converting to a packet switch network from circuit based TDM leased lines. The Loss Less Data compression option provides a 56 to 1 compression, which minimizes the bandwidth required to interconnect, is especially well suited to Cellular communication links. 

Engage's first deployment of the IPTubeE1, in the Spring of 2000, was for an international interconnection of a Cellular Base Station to a Base Station Controller.

Note: The Ethernet Switch Option has the sophistication to support Ethernet Native Base Station applications with QOS and rate limiting.

Cellular Base Station Backhaul Diagram

Broadband Service Providers

Companies, that are able to provide IP Ethernet access networks generate new revenue by offering traditional E1 leased line and private line services, such as:

Cable Operators

Cable operators connect traditional E1 leased line and private line services over their hybrid fiber coax (HFC) cable networks. HFC Cable network latency typically requires echo cancellation.

Metropolitan Area Networks

Metropolitan carriers with IP or Ethernet access networks deliver traditional leased line and private line services.


Utilities generate new revenue by offering traditional E1 leased line and private line services over their fiber or power line networks.

Incumbent Carriers

Telcos reduce costs by delivering profitable leased and private line services over their flexible Ethernet infrastructures.

CLEC PBX Back Haul

The IPTube UNO E1 provides CLECs with a way to back haul E1 DS0s from a customer’s phone systems over their Internet connection. The back hauled DS0s are connected to the CLECs phone switch for connection to the Public Switched Telephone Networks. Local Exchange Carriers are able to offer an economical alternative to the local Phone Company.

International Toll Bypass

The IPTube E1’s most dramatic cost savings is when it is used for the international interconnections of TDM based telecommunication equipment. The IPTube E1 is interoperable with the European TDM standard E1.


LAN Network Interface
  • One 10/100BaseT Full/Half Ethernet (2nd LAN requires Switch)
  • Autonegotiation or Configurable Speed and Duplex
LAN Network Protocols Supported
  • Assured Delivery Protocol 
  • DHCP
  • DNS Address Discovery
  • Dynamic DNS
1 to 4 Duplicate Packet Transmission
  • Resilient performance through a lossy interconnect
E1/Fractional E1 Specifications
  • One Port 120 ohm Model (75 Ohm w adapter) 
  • G.704 framed CRC4 or FAS and G.703 Unframed 
  • Coding - HDB3 or AMI
  • Supports DS0 assignments from 1 to 31
  • Not Contiguous Configuration x-y,z Supported
  • Comprehensive Clocking: 
    • Internal – the master clock source for the TDM circuit is provided by an internal clock oscillator
    • Network/Loopback – the transmit clock is derived from the E1 port
      receive clock
    • Adaptive – the clock is recovered from the Ethernet network interface
E1 Over IP Protocol
  • TDM Over IP
  • Assured Delivery Protocol
  • Circuit Extension Services Over IP - CESOIP
  • Frames Per Packet Configurable 8 to 40
  • Extremely low processing delay under 2 milliseconds
  • Low Latency Mode: 500 microseconds 4 E1 frames
  • Max Payload Mode: 5 millisecond 40 E1 frames
  • Configured jitter buffer to compensate for packet delay variance from 1.5 to 595 milliseconds
TFTP Online Upgrade Capable (FLASH ROMs)
  • IPTube is fully operational during upgrade
Ethernet Switch OPTION
  • Out of band management interface with independent IP configuration
  • 802.1Q VLAN support with Filtering for up to 64 VLANs 
  • Support both port-based membership or 802.1Q VLAN-based VLANs
  • 2,048 MAC address entries with automatic learning and aging
Lossless Data Compression OPTION
  • Detects idle and redundant data within each DS0
  • Configured Silence Detection Range
  • Interconnect bandwidth is not consumed by silent or redundant data 
  • Low Latency 8 to 1 Compression settings from 8 to 1 to 56 to 1
Quality of Service Support
  • IANA Registered UDP Port 3175
  • IP Type of Service (TOS) CLI configured 
  • Diffserv configuration of TDMOverIP header 
  • VLAN tagging and priority labeling according to 802.1p&Q
  • E1 Over IP frames are tagged with a dedicated VLAN ID.
  • Remote config., monitoring, & reset
  • Secure Socket Shell - SSH
  • Diffie-Hellman Group1/14 key exchange and strong integrity checking via MAC SHA1/SHA1-96 with Cipher AES-128 and 3DES and DSS and OpenSSH public key format
  • Telnet support with Edit and Paste Template Files
  • Console Port for Out of Band Management
  • SNMP support (MIB I, MIB II, Engage proprietary) with configured traps
  • CE
  • Safety -IEC60950
  • EMC - CFR 47 Part 15 Sub Part B: 2002, EN55022: 1994 + A1 & A2, EN55024, ICES-003 1997, CISPR 22 Level A 
  • Telecom TBR12, TBR13
Rear Panel/Power
  • 10-30 VDC, 1.0A.
  •  Screw Locking Connector
  • Power 7 Watts
  • Universal Adapter 100/240 VAC 50/60 Hz
  • Optional -48V 0.25 Amp
  • Hot Standby
  • Temperature: 0–50°C (32–122°F).
  • Optional Extended Temp ranges avail. 
  • Humidity: Up to 90% non-condensing
  • Dimensions: Length 6” x Width 4” x Height 1.50”
  • Weight 2 Pounds (1 kilogram)
  • Telco Diagnostics: Local Loop, Remote Loop, Loop Up/Down NIU and CSU Codes. Enables isolation of connectivity faults to local, network or remote equipment
  • Physical layer alarms for LOS, AIS, LOF 
  • Comprehensive statistics: LAN and IP layer network statistics: such as packet loss and packets arriving late, out of sequence, underruns, overruns CRC, and delay variation (jitter)

Ordering Information

Part No.



IPTube UNO E1, 1 Port


IPTube UNO E1 with xE1 Lossless Data Compression

Optional Features

Optional Features


ROHS compliant materials and processes, Restriction of Hazardous Substances no Pb


Protector Option, Fault Tolerant Network Interconnect. The protector option utilizes the second LAN interface as a redundant path for the interconnection of the IP encapsulated data. The extension of the IP-Tube has a fault tolerant link that is configured to always on, or with switch over criteria.  Learn more.


Alternator Load Balancing Option, Load Balancing Inverse Mux


T1 Multiplexer and DACS, Groom 2 to 24 remote locations Over IP


Rate Limiter Option, Reserve T1 Over IP Bandwidth


4 Port 10/100 Ethernet Switch with QOS / VLAN / Rate Limiter, Reserve T1 Over IP Bandwidth w Rate Limiter

Power Supply Options

Power Supply Options


90-220 VAC Universal International/Domestic Adapter


DUAL REDUNDANT, 90-220 VAC Adapter


Internal Power Module, -48 VDC Screw Terminals


DUAL REDUNDANT, -48 VDC Screw Terminals


WIREDC Option, +24 VDC Screw Terminals



Rack Mount Options

Rack Mount Option


Rack Mount Kit - for single 7" products (Fits both 19" and 23" racks)


2 unit 19" x 1RU Rack Mount Kit for 7" products




Right Angle Wall Mount Bracket Kit

So What's Next?


Engage Communication
9565 Soquel Drive. Aptos, CA 95003
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Telephone: 1-831-688-1021
Toll Free : 1-877-ENGAGE4
Designed, Fabricated, and Assembled
in America 
Supported Worldwide