9" (L) x 7.3” (W) x 1.50” (H)
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T1 Circuit Extension Over IP

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

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

Rack Mount and Power Options
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Rack Mount and Power Supply Options

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Rear Panel: 12/30 VDC ADAPTER (option)

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Rear Panel: 12/30 VDC with 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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PBX over Ethernet, T1 Channel Bank to IP converter


T1 Circuit Extension Over IP

- 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)


T1 Voice & Data Over IP / MPLS

The IPTube CEP GT1 encapsulates full and fractional T1 and TDM circuits, along with their framing and signaling bits, into IP packets. The IPTube CEP GT1's T1 Over IP, T1 Over Ethernet connection provides for the transparent interconnection of PBXs, T1 Channel Banks, Telecom Switches and T1 based communication systems via LANs, WANs, MANs, Satellite and Wireless Ethernet.

Transparent Interconnect

The IPTube CEP GT1 transparent operation maintains the proprietary signaling required to support PBX features such as call conferencing, call forwarding, caller ID and SS7. Legacy phone equipment investment is preserved. Transparent support for Modem, Fax, or Data circuits. Voice quality is not compromised.

Enable One to Four T1 interfaces for T1 over IP Voice and Data

The IPTube CEP GT1 is available with one to four T1 interfaces and three 10/100 BaseT Full/Half Duplex Ethernet Interfaces. The T1 interfaces have configurations that for provide independent protocol, compression, packet sizing, buffering, clocking, framing, coding and channel settings. Enable additional T1 Ports as needs expand using a software-based license key. The protocols supported are IPTube, CESoIP, and HDLCoIP.

IP•Tube CEP GT1 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 CEP GT1 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

Three LAN Interfaces

All IPTube CEP GT1 models ship with three 10/100BaseT Ethernet LAN ports. The Ethernet interfaces provide for: 

  • Management interface on MLAN 
  • Dual Data Plane 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 

Service Quality Packet Prioritizing

All IPTube CEP GT1 uses the Type of Service byte in the IP packets or 802.1p/q mac levels to prioritize the encapsulated T1 frames. QoS is used to ensure that the real time TDM data from the IPTube CEP GT1 is ensured high priority.

IP•Tube CEP GT1 Management

IPTube CEPs isolate management and data plane functionality with the use of two separate processor modules. Management processor access is limited to SSH or SNMPv3 encrypted sessions that employ AES 256 bit keys and sophisticated NIST passwords. These sessions may be established after authentication via TACACS+ or Radius.

The independent Linux based management plane of the IPTube CEP ensures Critical Infrastructure Data is isolated from management network access. The Management Module uses internal serial ports to connect to the Data Plane processor.

Administration and User Logs are available with Syslog.

CEP management security features include:

  • Administrative policies for adding, removing, disabling and renaming authorized users; limiting user access to assigned commands; and enabling only desired port numbers.
  • User authentication directly or in conjunction with TACACS+ or RADIUS servers including RSA SecureID support for two factor trusted compliance.
  • An SSH command interface encrypting management traffic with powerful 256 bit symmetric keys and NIST based passwords.
  • Support of the SNMPv3 protocol for secure connectivity to SNMP element managers.
  • In addition, administrative accounting data can be reported to syslog servers with accurate timestamps provided by an NTP source.

VPN Network Management

Interconnecting the IPTube CEP GT1 through a Virtual Private Network with a sufficient real time committed information rate ensures that the required quality of service is provisioned.

The IPTube CEP GT1's Management Plane LAN Ethernet interface provides a management port when the Data Plane Ethernet interface is connected to a VPN. Each Ethernet LAN interface features independent IP network configurations.

VPN Network Management Diagram

IP•Tube CEP GT1 Optional Features

Lossless Data Compression Option -C

The IPTube CEP GT1-C detects idle/redundant data within each DS0 resulting in as much as 56 to 1 bandwidth savings. T1 over IP bandwidth is not consumed by silent or redundant circuits.

Lossless Data Compression Diagram

Alternator Load Balancing Option

The IPTube CEP GT1-ALT Alternator option alternatively sends the IP packetized T1 frames on LAN 1 and LAN 2. The Alternator option enables fractional and full T1 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. The cost of interconnecting T1 communication systems across packetized xDSL is a fraction of long distance leased T1 circuit costs.

Alternator Load Balancing Diagram

Protector Option

The protector option utilizes the second Data Plane LAN interface as a redundant path for the interconnection of the IP encapsulated T1 Circuit. The extension of the T1 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.

Pay-As-You-Grow Field Upgrades

The IPTube CEP GT1 are designed for Pay-As-You-Go growth from 1 T1 thru 4 T1s. Customers can elect to economize initial network installations, by purchasing their IPTube CEP GT1 with a single active T1 port. As the network grows enable additional T1 Ports via a software-based license key. Field upgrade benefits are extended to our Industry-Best Lossless Data Compression. Just as T1 ports are field upgradeable, so is Lossless Data Compression. At any time, each T1 port on the IPTube CEP GT1 can be upgraded to Lossless Data Compression with a simple software-based license key installation. If upon installation, you determine that your IPTube CEP GT1s are best deployed with Lossless Data Compression, you're still in business with the per port field upgrade!


T1 to Ethernet T1 Channel Bank to MPLS IP

Far End Echo Cancelling Diagram


The most compelling option for the interconnection of T1 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, facilitate a very very significant cost savings especially for Multinational Corporations. The IPTube CEP GT1, a model 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 circuits.

IP Cellular Back Haul

IPTube CEP GT1s are used to provide transparent interconnection of the base stations (BTSs), base station controllers (BSCs) and mobile switching centers (MSCs) over IP/Ethernet packet-switched networks. Supported access media include fiber, coax and fixed wireless. Cellular phone service providers are able to save substantially by converting to a packet-switch network from circuit TDM lease lines. The IPTube CEP GT1 has the duplicate packets transmission and reception feature that provides for resilient performance through a lossy interconnect.

IP Cellular Back Haul 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 T1 based communication equipment is made possible with the IPTube's T1 Over Ethernet capability.

Wireless Ethernet Diagram

IP/Ethernet Service Providers

Companies, that are able to provide IP/Ethernet access networks generate new revenue by offering traditional T1 leased line and private line services, such as:

Cable Operators

Cable operators connect traditional T1 leased line and private line services over their hybrid fiber coax (HFC) cable networks.

Metropolitan Area Networks

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


Utilities generate new revenue by offering traditional T1 leased line and private line services over their fiber or power line networks.

PBX Back Haul

The IPTube CEP GT1 provides CLECs with a way to back haul T1 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. Competitive Local Exchange Carriers are able to provide customers with a very economical alternative to the local Phone Company since the Local Loop charges for each phone line are consolidated.

Incumbent Carriers

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

International Toll Bypass

The IPTube CEP GT1’s most dramatic cost savings is when it is used for the international interconnections of TDM based telecommunication equipment. The IPTube CEP E1 is interoperable with the European TDM standard E1.


LAN Network Interface
  • LAN1/LAN2: Two Data Plane 10/100 Base T
  • MLAN: Control Plane 10/100 Base T
  • Autonegotiation or Configurable Speed and Duplex
LAN Network Protocols Supported
  • IP, TCP, UDP, ICMP, Telnet, SSH
  • Assured Delivery Protocol 
  • DHCP
  • DNS Address Discovery
  • Dynamic DNS
  • Network Timing Protocol - NTP
1 to 4 Duplicate Packet Transmission
  • Resilient performance through a lossy interconnect
T1/Fractional T1 Specifications
  • One to Four Port Models
  • Connects directly to T1 or DS1
  • Framing - ESF or D4
  • Coding - B8ZS or AMI
  • Supports DS0 assignments from 1 to 24
  • Non Contiguous Configuration x-y,z Supported
T1 Over IP Protocol
  • TDM Over IP
  • Circuit Extension Services Over IP - CESOIP
  • Frames Per Packet Configurable 8 to 56
  • Low Latency Mode: 1 millisecond 8 T1 frames
  • Max Payload Mode: 5 millisecond 56 T1 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 56 to 1
Online Upgrade Capable (FLASH ROMs)
  • IPTube 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 Part68 
  • Secure Socket Shell - SSH
  • Centralized Authentication, Authorization & Accounting
    • TACACS+, RADIUS, Two Factor Authentication: RSA SecurID
  • Syslog with NTP Time Stamping
  • 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 
  • 9" (L) x 7.3 ” (W) x 1.50” (H) 
Rear Panel/Power
  • 12-30 VDC, 1.0A. 
  • Screw Locking Connector
  • Ships with International Adapter
  • Optional -48V 0.25 Amp
  • Hot Standby with 2nd Power Module

Ordering Information

Chassis Slot Card: IP-Tube CEP GT1

Rack Mount & Power Supply Options:

BlackGate RS232 Rear
BlackGate RS232 Rear

Part No.



IPTube CEP GT1, xT1, *Note: x = Specified # of T1 Ports (1 to 4)


Chassis Slot Card: IPTube CEP GT1, xT1, *Note: x = Specified # of T1 Ports (1 to 4)


IPTube CEP GT1 with xT1 w/Compression, *Note: x = Specified # of T1 Ports (1 to 4)


Chassis Slot Card: IPTube CEP GT1 with xT1 compression, *Note: x = Specified # of T1 Ports (1 to 4)

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


T1 Switch Option, Provides for Manual Switching of T1 or T1 Over IP


Link Protector Option, Automatic T1 Circuit Backup with T1 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