Verilink Red Zone Encryption (REMS) (880-502423-001) Product Manual - Manual (Page 40)

Theory of operation
3-14 Red Zone Encryption Management System (REMS) User Manual
Figure 3-7 Where the FBR code is processed
The communication from the BRC to its FBR is one-way because the
near-end FBR uses the exclusive-OR function to extract the performance
data from the decrypted FBR code (with an inserted BRC performance
message).
Red Zone
Common Carrier
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
Encryptor Encryptor
encrypted
FBR code FBR code
message
performance
originating BRC
combined encrypted
FBR code and
BRC performance message
decrypted FBR code
(with inserted BRC
performance message)
local FBR
reference
resulting BRC
performance
message
A
B
C
D
E
F
G
code
KG81
KG94
KG81
KG94