Verilink Red Zone Encryption (REMS) (880-502423-001) Produc Manuel d'utilisateur télécharger pdf (Page 27)

Red Zone Encryption Management System (REMS) User Manual User Manual

3-1

Chapter

3 Theory of operation

This section provides technical background on problems with encryption

over service carrier networks and the REMS solution to these problems.

In depth material is presented on how REMS functions are allocated to

and performed by its dual components, the FBR and the BRC. Subjects

covered are framing, alignment, and system communication.

Verilink solves historical problems of encryption over

T1 networks

When using the public telecommunications network to transport a full

bandwidth encrypted signal, two areas have been problematic:

■

positioning the framing bit

■

having access to Black Zone information about performance data,

network alarms, and fault isolation from the Red Zone

Framing

Encrypted T1

signals

Transmission of encrypted, full bandwidth T1 signals across the public

switched network has always been a challenge to the communication

engineer. In the past, the carrier furnished a custom T1 facility to

transport encrypted T1 data in an unframed format. In today’s world,

custom T1 facilities are nonexistent or, at best, very expensive.

The challenge to the user is how to economically hand off a framed, full

bandwidth encrypted signal from the secure Red Zone to the carrier in the

non-secure Black Zone. The previously accepted method has been to

reposition the DTE frame bit into the payload before encryption and

insert the network framing sequence into the bit stream after encryption.

This process requires payload bandwidth to transport the DTE framing

sequence to the far end. Transport of the framing information is necessary

to ensure that at the far end, DTE framing is positioned correctly with

respect to the payload.

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Verilink Red Zone Encryption (REMS) (880-502423-001) Produc Manuel d'utilisateur Page 27