SG-9500 Hardware Guide
3
Bypass
3.1
External Bypass Unit
The SG-9500 operates with one or two external Bypass Units. 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).
NOTE The SG-9500 cannot support more than two bypass units.
A single HD 24 Fiber Bypass supports 12 links (24 ports), an HD 16 Fiber Bypass unit
supports up to 8 links (16 ports). an HD 8 Fiber Bypass Unit supports up to 4 links (8
ports) and an HD 4 can support up to 2 x 100G MM links (4 ports). In terms of
Management, each Bypass unit is connected to the SG-9500 via a single USB cable.
NOTE If you have mix of Single-Mode and Multi-Mode optical interfaces in a single
SG-9500 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 a Single-Mode Bypass and all Multi-Mode
ports (SR) should be connected to a Multi-Mode Bypass.
ATTENTION
Ports that are used for ste
e
ring should not be routed through Bypass.
The following bypass units are supported by the SG-9500:
PRODUCT NUMBER
DESCRIPTION
SUPPORTED INTERFACES
SG-BYPS-EXT-16P-MM-B
HD 4 Multi-Mode Fiber Bypass
40G, 100G
SG-BP-EXT-8P-MM-A
HD 8 Multi-Mode Fiber Bypass
1G, 10G
SG-BP-EXT-8P-SM-A
HD 8 Single-mode Fiber Bypass
1G, 10G, 40G, 100G
SG-BP-EXT-8P-MM-
50UM-A
HD 8 Multi-Mode Fiber Bypass,
50/125 um
1G, 10G
SG-BP-EXT-8P-COP-A
HD 8 Copper Bypass
1G
SG-BP-EXT-24P-MM-A
HD 24 Multi-Mode Fiber Bypass 1G, 10G
SG-BP-EXT-24P-SM-A
HD 24 Single-Mode Fiber Bypass 1G, 10G, 40G, 100G
SG-BP-EXT-16P-MM-A
HD 16 Multi-Mode Fiber Bypass 1G, 10G