Allot SG-9100 Hardware Guide
3-1
Chapter 3:
Bypass
External Bypass Unit
The SG-9100 operates with an external Bypass Unit. The Bypass Unit is a mission-
critical subsystem designed to ensure network connectivity at all times. The Bypass
mechanism provides "connectivity insurance" in the event of a subsystems failure. Each
Allot Bypass unit features low insertion loss (< 1dB) in both Normal mode and Bypass
mode and fast switching time (< 10mSec) between modes. A Service Gateway unit
Network ports must be connected to the appropriate External Bypass Unit. This is to
ensure continuous service in the event of failure. The Service Gateway should be
ordered with appropriate Bypass Units considering total number of ports that need
bypass protection and Fiber interface Type (Multi-Mode / Single-Mode).
A single HD 16 Fiber Bypass unit supports up to 8 links (16 ports) and an HD 8 Fiber
Bypass Unit supports up to 4 links (8 ports). In terms of Management, all Bypass units
are connected to the SG-9100 via a single USB cable.
NOTE
If you have mix of Single-Mode and Multi-Mode optical
interfaces in a single SG-9100 system, then you will need to
split them into groups and connect them to appropriate
Bypass according to interface type. i.e. all Single-Mode ports
(LR) should be connected to Single-Mode Bypass SG-BP-EXT-
16P-SM-A or SG-BP-EXT-8P-SM-A, All Multi-Mode ports (SR)
should be connected to Multi-Mode Bypass SG-BP-EXT-16P-
MM-A or SG-BP-EXT-8P-MM-A.
ATTENTION
Ports that are used for ste
e
ring should not be routed through
Bypass.
The following bypass units are supported by the SG-9100:
PRODUCT NUMBER
DESCRIPTION
SG-BP-EXT-16P-MM-A
HD 16 Multimode Fiber Bypass
SG-BP-EXT-16P-SM-A
HD 16 Single-mode Fiber Bypass
SG-BP-EXT-8P-MM-A
HD 8 Multimode Fiber Bypass
SG-BP-EXT-8P-MM-50UM-A
HD 8 MM Fiber Bypass, 50/125 um
SG-BP-EXT-8P-SM-A
HD 8 Single-mode Fiber Bypass
SG-BP-EXT-8P-COP-A
HD 8 Copper Bypass
