IP-Tube DL T1
IP•Tube DLE1
9" (L) x 7.3” (W) x 1.50” (H)
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T1 Ethernet Converter

• ROI Measured in Weeks
• Exploits Efficiency of IP/Ethernet
• Supports Legacy Switches/PBX
• Straightforward Configuration

Rack Mount and Power Options
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Rack Mount and Power Supply Options

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Rear Panel: 12/30 VDC/AC Adapter (option)

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Rear Panel: 12/30 VDC Screw Term Adapter (option)

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Rear Panel: 12/30 VDC with Negative 48 VDC Screw Term Adapter (option)

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IP•Tube DLE1

Convert E1 to Ethernet

IP•Tube DLE1

Convert E1 to Ethernet

- ROI Measured in Weeks -

- Exploits Efficiency of IP/Ethernet -

- Supports Legacy Switches/PBX -

- Straightforward Configuration -

Product Image


9" (L) x 7.3” (W) x 1.50” (H)


E1 Voice and Data over IP

The IPTube DLE1 encapsulates full and fractional E1 circuits into IP packets. E1 Over IP connections provide for the interconnection of PBXs and Telecom Switches via LANs, WANs, MANs, Satellite and Wireless Ethernet. 

The IPTube DLE1 ships with two E1 interfaces with either 1 or 2 active and two 10/100 BaseT Ethernet Interfaces. The E1 interfaces have configurations that for provide independent protocol, compression, packet sizing, buffering, clocking, framing, coding and channel settings. The inactive E1 Port can be activated via a software-based license key for a pay as you grow option.

Transparent Interconnect

The IPTube DLE1'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, and Proprietary out of band are supported. Transparent support for Data, Modem or Fax. Voice quality is not compromised.

Signaling Support Diagram

IP•Tube DLE1 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 DLE1 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

Dual LAN Interfaces

  • Management interface on LAN port 2 when LAN port 1 is connected to a VPN tunnel 
  • The LAN ports can be configured to support connections over 2 opposite ADSL links 
  • Alternator Option for load balanced SDSL interconnects 
  • Protector Option for Redundant Packet Path connections with Constant or Switch Over Criteria

Full E1 Connection Across Two ADSL Lines

All IPTube DLE1's two Ethernet interfaces are able utilize two ADSL Ethernet Modems, that have opposite high speed direction, to transport an E1’s symmetrical bandwidth.

Virtual Private Network Support

Interconnecting the IPTube DLE1 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.

Virtual Private Network Diagram

IP•Tube DLE1 Optional Features

DS0 Timeslot Multiplexor OPTION -MUX

The IPTube DLE1-MUX maps DSOs from a central site to as many as 31 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 Option Diagram


The E1 switch option enables the E1 Port 1 interface to be manually switched between a E1 circuit connected to E1 Port 2 or to E1 Over IP packets connected with the remote IPTube.

  • Remote Control of E1 Connection to Telco or E1 over IP
  • Installation performed by a single Technician
  • Quick reversion to Telco during debug of E1 over IP
E1 Switch Diagram

E1 Link Protector OPTION -LPT

The E1 Link Protector provides an automatic back up for E1 circuits with E1 Over IP connecting via Wireless Ethernet, Gigabit Ethernet, IP Satellite Services, xDSL,...

  • Automatic Protection Switch for E1 Circuit
  • Deliver on Stringent Service Level Agreements
  • Back Up for Mission Critical Connectivity
  • Disaster Recovery for Public Safety Network
E1 Link Protector Diagram

Lossless Data Compression OPTION -C

The IPTube DLE1-C continuously detects idle and redundant data within each E1 Voice circuit resulting in as much as a 56 to 1 bandwidth savings. TDM over IP WAN bandwidth is not consumed by silent or redundant circuits. Note: Compression only supported with IPTube DLE1-C models.

Lossless Data Compression Diagram

Alternator Load Balancing OPTION -ALT

The IPTube DLE1-ALT Alternator option alternatively sends the IP packetized E1 frames on LAN 1 and LAN 2. The Alternator option enables fractional and full E1 circuits to be split over two IP WAN connections such as xDSL. The Lossless Data Compression option can be combined with the Alternator option to minimize the bandwidth required from the alternative paths.

Alternator Load Balancing Diagram

Rate Limiter OPTION -RLM

The IPTube DLE1-RLM 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. The data rate governor utilizes Time Division Multiplexing based clocking to provide for Nx64, NxE1 and NxFT3 bandwidth regulation that is configured from 64 kilobits up to 45Mbits.

Rate Limiter Diagram

Protector OPTION -PRO

The protector option utilizes the second LAN interface as a redundant path for the interconnection of the IP encapsulated E1 Circuit. The extension of the E1 circuit has a fault tolerant link that is configured to always on, or with switch over criteria. 

Protector OPTION -EnPRO

The Enhanced version has configuration parameters that enable a secondary packet path with high relative delay to primary path be synchronized. The packet sequence delay synchronization ensures concurrent redundancy with a high degree of error tolerance. Error free operation is accomplished when a primary or secondary Packet is not received and a redundant duplicate packet is available. The IPTube also supports the transmission of multiple duplicate packets to support Mission Critical Circuit extension with redundancy that is only limited by the bandwidth provisioned. 

Protector Option -EnPRO Diagram

Pay-As-You-Grow Field Upgrades

The IPTube DLE1 are designed for Pay-As-You-Go growth from 1 E1 to 2 E1s. Customers can elect to economize initial installations, buy purchasing a single active E1 port and enable the additional E1 Port via a software-based license key. Field Upgrade benefits are extended to our Industry-Best Loss less Data Compression. Just as E1 ports are field upgrade able, so is Loss less Data Compression. At any time, each E1 port on the IPTube DLE1 can be upgraded to Loss less Data Compression with a simple software-based license key installation. If you determine that your IPTube DLE1 is best deployed with Loss less Data Compression, you're still in business with the per port 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 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 DLE1 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 FDDI and 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. The IPTube DLE1 with lossless 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.

Cellular Base Station Backhaul

IPTube DLE1s are used to provide transparent interconnection of the Base Stations, Base Station Controllers and Mobile Switching Centers over IP Ethernet packet-switched networks.

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 40 to 1 compression, which minimizes the bandwidth required to interconnect, is especially well suited to Cellular communication links.

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

Cellular Base Station Backhaul Diagram

Wireless Ethernet

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.

Wireless Ethernet 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.

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 DLE1 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 DLE1's most dramatic cost savings is when it is used for the international interconnections of TDM based telecommunication equipment. The IPTube T1s are interoperable with the European TDM standard E1.


LAN Network Interface
  • Two 10/100BaseT Full/Half Ethernet
  • 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 or two G.703 Port 120/75 ohm Models
  • Connects directly to E1 or DS1
  • Framing - CRC4 or FAS or UnFRAMED
  • Coding - HDB3 or AMI
  • Supports DS0 assignments from 1 to 31
  • Not Contiguous Configuration x-y,z Supported 
E1 Over IP Protocol
  • TDM Over IP
  • Circuit Extension Services Over IP - CESOIP
  • Frames Per Packet Configurable 8 to 40
  • Low Latency Mode: 1 millisecond 8 E1 frames
  • Max Payload Mode: 5 millisecond 40 E1 frames
  • Comprehensive Clocking: Internal, Network, Adaptive
Lossless Data Compression Option
  • Detects idle and redundant data within each DS0
  • Configurable Silence Detection Range
  • Interconnect bandwidth is not consumed by silent or redundant data
  • Compression settings from 8 to 1 to 40 to 1
TFTP Online Upgrade Capable (FLASH ROMs)
  • IP-Tube is fully operational during upgrade
Quality of Service Support
  • IP Type of Service (TOS) CLI configurable
  • IANA Registered UDP Port 3175
  • 802.1p/q mac level prioritization
  • 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
  • Secure Socket Shell - SSH
  • Telnet support with Edit and Paste Template Files
  • Console Port for Out of Band Management
  • SNMP support (MIB I, MIB II) with configurable traps
  • Remote config., monitoring, & reset
  • Telco Diagnostics: Local Loop, Remote Loop
Rear Panel/Power
  • 12-24 VAC/VDC, 1.0A. International Adapters Available
  • Optional -48V 0.25 Amp
  • 9" (L) x 7.3 ” (W) x 1.50” (H) 

Ordering Information

Chassis Slot Card: IP-Tube DLE1

Rack Mount & Power Supply Options:

BlackGate RS232 Rear
BlackGate RS232 Rear

Part No.



IPTube DLE1, xE1, *Note: x = Specified # of E1 Ports (1 to 2)


IPTube DLE1, with xE1 Compression, *Note: x = Specified # of E1 Ports (1 to 2)

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


E1 Multiplexor and DACS, Groom 2 to 31 remote locations Over IP


Rate Limiter Option, Reserve E1 Over IP Bandwidth


E1 Switch Option, Provides for Manual Switching of E1 or E1 Over IP


E1 Coaxial 75 OHM Option, Ports Impedance -120 Ohm Default


Link Protector Option, Automatic E1 Circuit Backup with E1 Over IP

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