Verilink Red Zone Encryption (REMS) (880-502423-001) Product Manual - Manual (Page 36)

Theory of operation
3-10 Red Zone Encryption Management System (REMS) User Manual
How performance data is distributed
The following four figures show how information from Black Zone
performance registers is transferred to the Red Zone.
Figure 3-3 Network performance data is collected in the Black Zone
Figure 3-4 The BRC encodes and transmits the performance data
Now, the Black Zone performance registers need to be transmitted to and rebuilt at
the FBR. To do this, the BRC creates a BRC performance message and transmits it
by using an algorithm to force errors on the encrypted FBR code.
Red Zone
Common Carrier
or
Local Exchange
Networ
B
R
C B
R
C
Black Zone
Near-End
Near-End
Performance
Registers
Far End
Performance
Registers
CRC-6 inserted
CRC-6 verified
Near-End
Performance
Registers
PRM
To detect errors, each BRC creates a CRC-6
for the data it transmits and verifies the
CRC-6 for the data it receives. This Black
Zone error information is collected in
performance registers. To exchange
performance register information, BRCs
send standard PRMs across the ESF Facility
Data Link. The ESF Facility Data Link is
concurrently carrying ESF framing bits and
encrypted FBR code.
Red Zone
B
R
C F
B
R
Black Zone
Near-End
Near-End
Performance
Registers
Far-End
Performance
Registers
Combined
encrypted FBR code and
BRC performance message
KG81
Encryptor
KG94