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Chapter 1 Introduction
Installation and Operation Manual
The internal packet ports are connected to the chassis packet buses via two Fast
Ethernet transceivers.
Support for N+1 Protection
VC-E1/16 and VC-E1/12 modules operating in the internal ports (US_NS) mode
(see VC-E1/16 Operating Modes section on page 1-16) support the N+1
protection mode, one of the Gmux-2000 APS functions. The N+1 protection
function is managed by the Gmux-2000 control subsystem, and operates
independently of the other Gmux-2000 APS capabilities.
An N+1 protection group is formed by adding a spare (standby, or protection)
module to a group of N modules that carry the traffic (the protected modules).
All the N+1 modules must be of the same type, that is, either VC-E1/16 or
VC-E1/12.
N+1 protection for VC-E1/16 modules operates as follows:
•
When all of the N traffic-carrying (protected) VC-E1/16 or VC-E1/12 modules
operate normally, the protection VC-E1/16 module is idle.
•
When any one of the N traffic carrying modules reports a malfunction, the
malfunctioning module is automatically replaced by the protection module,
thereby restoring the original traffic capacity.
The process used to replace a protected module by the protection module is
as follows:
ƒ
The Gmux-2000 control subsystem automatically downloads the
configuration of the malfunctioning module to the protection module.
Therefore, no configuration data should be prepared by the user for the
protection module
ƒ
The Gmux-2000 control subsystem updates the internal traffic flow
configuration within the chassis:
…
…
At the telecom buses side: the malfunctioning module is disconnected
from the telecom buses, and the protection module is connected in
accordance with the downloaded configuration. Therefore, no change
in SDH link mapping takes place
At the packet buses side: the Fast Ethernet buses of the
malfunctioning module are disconnected from the GbE module(s), and
those of the protection module are connected in accordance with the
downloaded configuration. Therefore, only the internal packet routing
is affected: no change is visible from outside the Gmux-2000 chassis.
The whole process may require up to 30 seconds, after which service is
completely restored.
•
1-14
After the malfunctioning module is replaced, and is again ready for service,
the reverse process automatically takes place, with the result that the
protected module is returned to service, and the protection module is again
idle and ready to protect any other malfunctioning module in the group.
Functional Description
VC-E1/16, VC-E1/12 GM-2000 Ver. 3.2