Chapter 7. ONS 15454 Ethernet Applications and Provisioning


This chapter covers the following topics:

  • ONS 15454 E-Series Interface Cards

  • ONS 15454 G-Series Interface Cards

  • ONS 15454 CE-Series Interface Cards

  • ONS 15454 ML-Series Interface Cards

As noted in Chapter 6, "MSPP Network Design Example: Cisco ONS 15454," the ONS 15454 Multiservice Provisioning Platform (MSPP) provides multiple types of Ethernet interface cards for a variety of applications. These interface cards fall into two broad categories: transport (Layer 1) Ethernet interfaces and multilayer (Layer 2 and Layer 3) Ethernet interfaces. The following is a categorization and brief description of each of the Ethernet interface cards covered in this chapter:

  • E Series The E-Series cards can be considered members of both Ethernet interface card categories because they can be used in both transport applications and switched applications. The E-Series cards were the first Ethernet cards introduced for use in the ONS 15454 MSPP. This series includes an Ethernet/Fast Ethernet card and a Gigabit Ethernet (GigE) card. The E Series supports both point-to-point links and shared packet-ring topologies.

  • G Series The G-Series cards are four-port Layer 1 transport cards with GigE interfaces. These cards support subrate and line-rate GigE point-to-point links.

  • CE Series The CE Series currently includes an eight-port Layer 1 transport card with 10-/100-Mbps Ethernet/Fast Ethernet interfaces. CE-Series cards support subrate and line-rate Ethernet and Fast Ethernet point-to-point links.

  • ML Series Three card types comprise the "flagship" Ethernet interfaces for the ONS 15454, the ML Series. The ML Series can be thought of as Layer 2/Layer 3 switches embedded into the Synchronous Optical Network (SONET)/Synchronous Digital Hierarchy (SDH) network. These cards support a rich set of features and interface types.

Typically, each series (or family) of ONS 15454 Ethernet cards is used in a SONET/SDH network. For example, ML-Series cards are used to interoperate with other ML-Series cards within a SONET/SDH ring. However, some Ethernet cards from different series can interconnect with each other using circuits configured between their respective Packet over SONET/SDH (POS) interfaces. The limitation of mixing these types to interoperate in a network is that they are limited to frame-forwarding (Layer 1) functionality only. So, for example, if a circuit is built between the POS interface of an ML-Series card and the POS interface of a G-Series card, the switch features of the ML-Series card (such as VLANs) are not supported. To achieve Ethernet card POS interoperability between cards of dissimilar series, the POS encapsulation type (LEX, for example), the cyclic redundancy check (CRC) size, and the framing mode (HDLC, for example) must match at the POS endpoints.

It is possible to interoperate cards in the ML Series, G Series, and CE Series. However, the E-Series cards use proprietary E-Series encapsulation and do not support POS interoperability with any of the other Ethernet card series.




Building Multiservice Transport Networks
Building Multiservice Transport Networks
ISBN: 1587052202
EAN: 2147483647
Year: 2004
Pages: 140

flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net