Verilink Red Zone Encryption (REMS) (880-502423-001) Product Manual - Manual (Page 30)

Theory of operation
3-4 Red Zone Encryption Management System (REMS) User Manual
Figur e3-2, Signal Content Across Circuit illustrates the T1 signal content
at each segment of the path from DTE to DTE. The figure shows
transmission from the near end to the far end.
Figure 3-2 Signal Content Across Circuit
Red Zone
Common Carrie
or
Local Exchange
Networ
B
R
C B
R
C F
B
R M
U
X
Black Zone Red Zone
Access Manager 2000
M
U
X
F
B
R
Near-End Far End
KG81
Encryptor
KG94
D4/ESF-framed
plain text
FBR-framed
plain text
(encrypted
FBR data)
cipher text
ESF-framed cipher text
FBR-framed
plain text D4-framed
plain text
frame bit is offset frame bit is restored
to original position
direction of transmission
KG81
Encryptor
KG94