Transition Networks, Inc.
S4224 Web User Guide
33595 Rev. C
Page 655 of 669
O
OAM
OAM (Operation Administration and Maintenance) protocol is described in ITU-T Y.1731 and is used to
implement carrier ethernet functionality. MEP functionality like CC and RDI is based on this. The S4224
provides configuration and monitoring of two types of Ethernet OAM:
1) end-to-end service OAM (SOAM) per IEEE 802.1ag and ITU-T Y.1731, to let Ethernet service providers
monitor their services proactively, measure end-to-end performance, and guarantee that the customers receive
the contracted SLA. Fault monitoring and performance measurement include frame delay, frame delay variation,
frame loss and availability.
2) single segment Link OAM (LOAM) per IEEE 802.3ah for remote management and fault indication, including
remote loopback, dying gasp, and MIB parameter retrieval.
OID
(Object IDentifier) Many standards define certain objects that require unambiguous identification, which can be
achieved by ‘registration’. Registration is the assignment of an object identifier (OID) to an object in a way which
makes the assignment available to interested parties. It is carried out by a registration authority. Registration
can be effected by publishing in the standard the names and the corresponding definitions of object. Such a
mechanism requires amendment of the standard for each registration, and hence is not appropriate in cases
where the registration activity is high. Alternatively, registration can be affected by letting organizations act as
registration authorities to perform registration on a flexible basis.
The registration tree is managed in a completely decentralized way (a node gives full power to its children) and
it is impossible to be exhaustive (particularly world-wide). The registration tree is defined and managed following
the ITU-T X.660 & X.670 Recommendation series (or the ISO/IEC 9834 series of International Standards).
One-step clock
A clock that provides time information using a single event message.
Optional TLVs
An LLDP frame contains multiple TLVs. For some TLVs it is configurable if the S4224 includes the TLV in the
LLDP frame. These TLVs are known as optional TLVs. If an optional TLVs is disabled the corresponding
information is not included in the LLDP frame.
Ordinary clock
A clock that has a single Precision Time Protocol port in a domain and maintains the timescale used in the
domain. It may serve as a source of time (i.e., be a master clock), or may synchronize to another clock (i.e., be
a slave clock). An ordinary clock is a 1588 clock with a single PTP port.
OUI
OUI is the organizationally unique identifier. An OUI address is a globally unique identifier assigned to a vendor
by IEEE. You can determine which vendor a device belongs to according to the OUI address which forms the
first 24 bits of a MAC address.
P
Packet
An IPv6 header plus payload.
Parent clock
The master clock to which a clock is synchronized.
Path MTU
The minimum IPv6 link MTU of all the links in a path between a source node and a destination node.
