CN 3960 Hardware Installation Guide
F
Fault
(or System f ault) o ccurs either when an
alarm r eaches a cri tical level or when a
component(s) within the system fails.
Fault Detection
is defined as the time from a
failur e 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
refer s to netwo r k traf fic enter ing 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. MP LS allo ws m ost pa ckets to
be forwarded at layer 2 rather than at layer 3.
N
NNI
(Network to Network Interface) is an
interfa ce which specif ies sig nalin g and
management functions between two networks.
P
PHB
(Per- Ho p Beha vior ) is a descr ip tion of the
externally ob ser vab le fo rw ar d ing treatm ent
appl ied at a di ff eren tiated services-co m pl iant
node to a be havio r agg re gate.
PHBG
(P er-H op B eh av ior Grou p) i s a s et of one
or m or e PH Bs that can only be mea ning ful ly
specified and imp lem en ted sim ultan eou sly,
due to a common constraint applying to all
PHBs in the set such as a queue servicing o r
queue management policy.
Primary
is a redu ndan cy s tate mode indi cating
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 ar e offered. The provider
may or may not offer the services themselves.
Q
QoS
(Quali ty of Ser vice) gua ra ntees mi nim um
and maximum bandwidths for a service as well
as its prior ity rel ative to othe r ser vices. Qo S
policies consist of CIR, EIR, and p riority.
R
RU
(Rack Unit) is a measure of vertical space in
an equip m ent rack. O ne rack unit is equa l to
1.75 inches (4.4 5 cm) .
RSTP
(Rap id Spanni ng Tr ee Pr o toco l) is a
Layer 2 link management protocol defined in
IEEE 802.1W that pr o vide s networ k path
redun dan cy while pr eventing top ol og y loo p s.
RSTP im pr o ves on STP (I EEE 802. 1D ) by
achieving much faster convergence times.
S
SAC
(Service Access Control) allows a provider
to contro l pa cket for wa r ding ba sed on MAC
addr esses, either by def ining static MAC
addr esses or by lim itin g the num ber of
dynam ic MAC ad dr esses that are al low ed to
access the port.
SAS
(Service Aggregation Switches) are
network devices that transport Carrier
Ethernet services fr o m the Metro Edg e to the
access network. SAS network devices connect
to Service Del ivery Switches.
SDS
(Service Delivery Switches) are network
devices that are designed with a granularity of
for m and f unctio n fo r del iver ing a variety of
services fro m the Cu stomer Edge network.
Se ve rity
the degree of ur gency to which an
event is generally classified. Severity typically
lists three degrees of urge ncy; Critical, Major,
or Minor.
SFP
(Small Form-factor Pluggable) is a hot-
plugg ab le op tical transcei ver that can be
installed into a unit to tailor the characteristics
of the port. Different speeds, modes and
waveleng th of the SFPs ar e availa ble .
SNMP
(Sim ple N etwo rk M anag em ent Pr o toco l)
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 descri be the system co nfig ur atio n.
These variab les can then be qu eri ed (an d
some tim es set) by mana gi ng ap p licatio ns.
Spanning Tree Domains
is used in a network
that empl oys RSTP , a Spa nning Tree D omain
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
Contr o l Mo d ule in the event of fa ilo ver.
Subscriber VLAN
is a VLA N ID th at ex ist s in a
subscrib er ’s pri vate netwo rk that needs to be
preserved when traveling in the provider’s
network.
To Next Page
Loading...
