Verilink Red Zone Encryption (REMS) (880-502423-001) Produc Manual de usuario descargar pdf (Pagina 34)

Theory of operation

3-8

Red Zone Encryption Management System (REMS) User Manual

6. As the near-end DTE transmits its D4/ESF framed signal, the near-

end FBR extracts information about the location of the D4/ESF

framing bit.

7. The near-end FBR sends an FBR code that is aligned with the DTE

framing. This means, actually, that the FBR code is inserted into the

DTE framing bit position.

The far-end FBR identifies the FBR and BRC frame bit positions and

calculates an offset count.

8. The near-end FBR repositions the DTE framing bit, which contains

the FBR code, by an amount equal to the offset count. Only the

framing bit itself is repositioned, and the end-to-end (encode/decode)

delay of the entire signal is a maximum of one bit. The FBR code

and BRC framing bits now correspond to the same time slot.

Time

BRC

DTE

I = BRC inserted bit

F = D4 framing bit

Time

BRC

DTE

FBR code

FBR

offset = x

I = BRC inserted bit

F = D4 framing bit

FBR = FBR code

23 191

012

191

offset = x

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 96 97

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Verilink Red Zone Encryption (REMS) (880-502423-001) Produc Manual de usuario Pagina 34