CN 3960 Hardware Installation Guide
F
Fault
(or System fault) occurs either when an
alarm reaches a critical level or when a
component(s) within the system fails.
Fault Detection
is defined as the time from a
failure causing a loss of service to the system
becoming aware of it. Fault detection occurs in
individual device managers.
Fault Manager
is a device within the system
that handles fault monitoring, fault logging,
and fault policy management & execution.
I
Ingress
refers to network traffic entering a
network device or the point on a device where
network traffic enters the device.
M
MPLS
(Multiprotocol Label Switching) is an IETF
initiative that sets up a specific path for a given
sequence of packets, identified by a label given
to each packet. MPLS allows most packets to
be forwarded at layer 2 rather than at layer 3.
N
NNI
(Network to Network Interface) is an
interface which specifies signaling and
management functions between two networks.
P
PHB
(Per-Hop Behavior) is a description of the
externally observable forwarding treatment
applied at a differentiated services-compliant
node to a behavior aggregate.
PHBG
(Per-Hop Behavior Group) is a set of one
or more PHBs that can only be meaningfully
specified and implemented simultaneously,
due to a common constraint applying to all
PHBs in the set such as a queue servicing or
queue management policy.
Primary
is a redundancy state mode indicating
that the Active Control Module is managing the
system.
Provider
(or Service Provider) refers to an
entity who owns or administrates the network
over which services are offered. The provider
may or may not offer the services themselves.
Q
QoS
(Quality of Service) guarantees minimum
and maximum bandwidths for a service as well
as its priority relative to other services. QoS
policies consist of CIR, EIR, and priority.
R
RU
(Rack Unit) is a measure of vertical space in
an equipment rack. One rack unit is equal to
1.75 inches (4.45 cm).
RSTP
(Rapid Spanning Tree Protocol) is a
Layer 2 link management protocol defined in
IEEE 802.1W that provides network path
redundancy while preventing topology loops.
RSTP improves on STP (IEEE 802.1D) by
achieving much faster convergence times.
S
SAC
(Service Access Control) allows a provider
to control packet forwarding based on MAC
addresses, either by defining static MAC
addresses or by limiting the number of
dynamic MAC addresses that are allowed to
access the port.
SAS
(Service Aggregation Switches) are
network devices that transport Carrier
Ethernet services from the Metro Edge to the
access network. SAS network devices connect
to Service Delivery Switches.
SDS
(Service Delivery Switches) are network
devices that are designed with a granularity of
form and function for delivering a variety of
services from the Customer Edge network.
Severity
the degree of urgency to which an
event is generally classified. Severity typically
lists three degrees of urgency; Critical, Major,
or Minor.
SFP
(Small Form-factor Pluggable) is a hot-
pluggable optical transceiver that can be
installed into a unit to tailor the characteristics
of the port. Different speeds, modes and
wavelength of the SFPs are available.
SNMP
(Simple Network Management Protocol)
forms part of the internet protocol suite as
defined by the Internet Engineering Task Force
(IETF). SNMP is used in network management
systems to monitor network-attached devices
for conditions that warrant administrative
attention. SNMP exposes management data in
the form of variables on the managed systems,
which describe the system configuration.
These variables can then be queried (and
sometimes set) by managing applications.
Spanning Tree Domains
is used in a network
that employs RSTP, a Spanning Tree Domain
limits the reach of RSTP to certain areas of the
network.
Standby
refers to the secondary Control
Module that will assume the role as the Active
Control Module in the event of failover.
Subscriber VLAN
is a VLAN ID that exists in a
subscriber’s private network that needs to be
preserved when traveling in the provider’s
network.
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Summary of Contents for CN 3960
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