T1 / E1 Circuit Encryption

Product Image
Black•Door OPS
Product Image

Performance: 1 GIG

Post Quantum Ready: Option

Dimensions: 12" L x 5.5" W x 1.5" H

Black•Door DUO
Black•Door GIG
Black•Door 10/100


The BlackBond is a “bump in the wire” device that seamlessly encrypts T1 / E1 and fractional T1 / E1 circuits. It’s extremely low latency allows it to encrypt the circuit without impact to voice, video and data T1 / E1 traffic.

The BlackBond uses the strongest commercially available cryptography and automatically rotates cryptographic keys at user defined intervals. Key generation is performed by a FIPS compliant Random Number Generator (RNG).

The BlackBond is effective at protecting data in motion in virtually any network environment. It is available as a stand-alone device for remote locations, or as a slot-card in a multi-slot chassis for central site locations.

For networks requiring both security and redundant circuits, the BlackBond can be ordered with a protection switching option. In this case, the encrypted traffic will switch to a backup T1 / E1 circuit if the primary T1 / E1 circuit fails. Alternatively, the traffic could be switched over to a backup packet based connection, such as 4G LTE. 



  • Wireline T1 / E1 circuits
  • Fiber T1 / E1 circuits
  • Microwave T1 / E1 circuits
  • Fractional T1 / E1 circuits (satellite, etc.)
  • Circuit protection switching for encrypted T1 / E1
  • Packet protection switching for encrypted T1 / E1


  • Sophisticated AES 256 bit key encryption
  • Automated symmetric key rotation
  • Secure key generation with FIPS RNG
  • Compact and highly reliable (no fans)
  • Stand-alone and chassis slot-card configurations
  • Plug and play functionality
  • Software Upgradable


  • T1 / E1 data is secure in the event of a breach
  • Supports both full and fractional T1 / E1 networks
  • Extremely low latency ensures voice, video and data applications continue to operate seamlessly
  • Can completely “hide” original network traffic (including header / addresses)
  • Easy to setup and operate
  • Seamless integration into existing network
  • Doesn't consume compute resources from existing networking equipment
  • Central and remote site configurations


  • AES, 256 bit
  • Fully automatic key management (1 min to 42 day re-key interval)
  • Hardware Random Number Generator: NIST SP 800-90
  • Full duplex real-time encryption
WAN Network Interface
  • BlackBond T1
    • ► 2 x T1 (1 “Red” / 1 “Black”)
    • ► Framing: ESF 
    • ► Line Code: B8ZS or AMI [web site is HDB3 or AMI]
    • ► DS0 assignments from 1 to 24
    • ► Non-contiguous configuration supported (x-y, z)
  • BlackBond E1
  • ► 2 x E1 (1 “Red” / 1 “Black”)
  • ► Framing: CRC4
  • ► Line Code: HDB3 or AMI
  • ► DS0 assignments from 1 to 32
  • ► Non-contiguous configuration supported (x-y, z)
LAN Network Interface
  • 2 x 10/100 RJ45 Ethernet (full / half duplex)
  • Auto negotiation, or configured speed and duplex
LAN Network Protocols
    • IP, TCP, UDP, ICMP
Link Protector Option
  • Additional T1 / E1 port available as secondary circuit (switched to if primary fails)
  • Also, one of the LAN interfaces may be used as the secondary circuit (switched to if primary fails)
  • Command Line Interface (CLI)
  • Telnet with edit and paste template files
  • Console port for out of band management
  • SNMP
  • Remote configuration, monitoring and reset
  • Online software upgrade (TFTP, fully operational during upgrade)
  • Local and remote WAN loopbacks
Mounting / Physical
  • 19” rack mount (1U height)
  • Dimensions: 9” (L) x 7.3” (W) x 1.5” (H)
  • Optional Medeco Case
  • Available in multi-slot card chassis configuration
  • Input Range: 12 to 30 VDC, 1.0 Amp
  • Optional -48 VDC, 0.25 Amp
  • AC adaptor included (order per country)
    • Optional Dual Power, Hot Standby
  • Operating Temperature: -10° to 50° C (0° to 132° F)
  • Operating Humidity: Up to 90% (Non-Condensing)
  • Optional Extended Temperature Range Available
  • CE
  • Safety: IEC 60950
  • EMC: CFR 47 Part 15 Sub Part B: 2002, EN55022: 1994 + A1 & A2, EN55024, ICES-003 1997, CISPR22 Level A

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