Chapter 22 DLPs A500 to A599

DLP- A533 Create Ethernet RMON Alarm Thresholds

Table 22-6

Ethernet Threshold Variables (MIBs) (continued)

 

 

 

Variable

 

Definition

 

 

dot3StatsExcessiveCollisions

(Not supported by E-Series or G-Series) Number of frames

 

 

where transmissions failed because of excessive collisions

 

 

dot3StatsCarrierSenseErrors

(G-Series only) The number of transmission errors on a

 

 

particular interface that are not otherwise counted

 

 

dot3StatsSQETestErrors

(G-Series only) A count of times that the SQE TEST ERROR

 

 

message is generated by the PLS sublayer for a particular

 

 

interface

 

 

etherStatsBroadcastPkts

The total number of good packets received that were directed to

 

 

the broadcast address; this does not include multicast packets

 

 

etherStatsCollisions

An estimate of the total number of collisions on this Ethernet

 

 

segment. The value returned depends on the location of the

 

 

RMON probe. Section 8.2.1.3 (10Base5) and Section 10.3.1.3

 

 

(10Base2) of the IEEE 802.3 standard state that a station must

 

 

detect a collision, in the receive mode, if three or more stations

 

 

are transmitting simultaneously. A repeater port must detect a

 

 

collision when two or more stations are transmitting

 

 

simultaneously. Thus, a probe placed on a repeater port could

 

 

record more collisions than a probe connected to a station on the

 

 

same segment.

 

 

Probe location plays a much smaller role when considering

 

 

10BaseT. Section 14.2.1.4 (10BaseT) of the IEEE 802.3 standard

 

 

defines a collision as the simultaneous presence of signals on the

 

 

DO and RD circuits (transmitting and receiving at the same

 

 

time). A 10BaseT station can only detect collisions when it is

 

 

transmitting. Thus, probes placed on a station and a repeater

 

 

should report the same number of collisions.

 

 

An RMON probe inside a repeater should report collisions

 

 

between the repeater and one or more other hosts (transmit

 

 

collisions as defined by IEEE 802.3k) plus receiver collisions

 

 

observed on any coax segments to which the repeater is

 

 

connected.

 

 

 

 

Cisco ONS 15454 Procedure Guide, R7.0

22-36

November 2007

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Cisco Systems ONS 15454 manual 22-36
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ONS 15454 specifications

Cisco Systems ONS 15454 is a versatile optical networking platform designed to enable service providers and enterprises to deploy and manage robust optical networks efficiently. The ONS 15454 serves as a cornerstone in the evolution of transport networks, featuring various technologies that meet the increasing demand for bandwidth and service quality.

One of the standout features of the ONS 15454 is its support for multiple service types, including TDM, Ethernet, and Wavelength Division Multiplexing (WDM). This capability allows service providers to maximize network resources while delivering a wide range of services, from traditional voice to high-speed data and video.

The ONS 15454 leverages Dense Wavelength Division Multiplexing (DWDM) technology, enabling the transmission of multiple data streams over a single optical fiber. This effectively expands the network's capacity without the need for additional infrastructure, a crucial benefit in today's ever-growing data landscape. The system supports a variety of transponder modules, allowing for flexible scaling and seamless upgrades as bandwidth requirements increase.

Scalability is another key characteristic of the ONS 15454. With its modular architecture, it accommodates a range of interfaces and line cards, making it easier to tailor deployments to specific customer needs. This modularity not only facilitates upgrades but also simplifies maintenance, minimizing downtime and operational costs.

The platform also features advanced management capabilities through Cisco's Optical Network Management system. This allows for real-time monitoring, provisioning, and troubleshooting, ensuring network reliability and performance. The intuitive interface and comprehensive reporting tools enable operators to gain insights into network operations, improving decision-making processes.

Furthermore, the ONS 15454 is built to support optical layer protection features, enhancing network resilience. Technologies such as Automatic Protection Switching (APS) and Optical Supervisory Channel (OSC) ensure that connectivity is maintained even in the event of a failure, crucial for mission-critical applications.

In conclusion, the Cisco ONS 15454 is a powerful optical networking solution that combines flexibility, scalability, and advanced management features. Its support for various services and technologies positions it as an essential asset for organizations looking to build a future-proof network capable of handling increasing data traffic while maintaining high service standards.
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