Verilink Red Zone Encryption (REMS) (880-502423-001) Product Manual - Manual (Page 29)

Verilink solves historical problems of encryption over T1 networks
Red Zone Encryption Management System (REMS) User Manual 3-3
Keystones of the
New Functionality This new functionality has two keystones.
■
First, instead of making the CSU frame to the signal, the Access
System 2000 Red Zone Encryption Management System makes the
signal frame to the CSU. This is implemented as the system aligns
itself.
■
Secondly, the system makes innovative use of the 4 Kbps of ESF
Facility Data Link bits to securely transfer network management
data. These 4 Kbps transport FBR code and PRM messages.
The REMS T1 signal partitioning is illustrated in Figure 3 -1, REMS
T1 Signal Partitioning.
Figure 3-1 REMS T1 Signal Partitioning
This diagram shows how the T1 signal is partitioned as it passes through the REMS system. The CRC-6 and ESF
framing bits, which are added at the BRC are network-generated and, therefore, unencrypted.
Red Zone
Common Carrier
or
Local Exchange
Networ
B
R
C
F
B
R
Black Zone
Access Manager 2000
M
U
X
1.536 Mbps
PAYLOAD 8 Kbps 1.536 Mbps
encrypted payload
1.536 Mbps encrypted PAYLOAD
4 Kbps encrypted FBR code
1.536 Mbps
PAYLOAD 8 Kbps
2 Kbps CRC-6
2 Kbps ESF framing
D4/ESF framing
FBR code
8 Kbps encrypte
FBR code
Encryptor
KG81
KG94