Cisco ONS 15454 SDH Specifications download pdf (Page 348)

9-2

Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

Chapter 9 Ethernet Operation

G1000-4 Card

• High Availability (including hitless (< 50 ms) performance under software upgrades and all types of

SONET/SDH equipment protection switches)

• hitless re-provisioning

• support of Gigabit Ethernet traffic at full line rate

The G1000-4 card allows an Ethernet private line service to be provisioned and managed very much like

a traditional SONET or SDH line. G1000-4 card applications include providing carrier-grade

Transparent LAN Services (TLS), 100 Mbps Ethernet private line services (when combined with an

external 100 Mb Ethernet switch with Gigabit uplinks), and high availability transport for applications

such as storage over MAN/WANs.

You can map the four ports on the G1000-4 independently to any combination of VC4, VC4-2c, VC4-3c,

VC4-8c, and VC4-16c circuit sizes, provided the sum of the circuit sizes that terminate on a card do not

exceed VC4-16c.

To support a gigabit Ethernet port at full line rate, an STM circuit with a capacity greater or equal to 1

Gbps (bidirectional 2 Gbps) is needed. A VC4-8c is the minimum circuit size that can support a gigabit

Ethernet port at full line rate.The G1000-4 supports a maximum of two ports at full line rate.

Ethernet cards may be placed in any of the 12 multipurpose card slots. In most configurations, at least

two of the 12 slots need to be reserved for optical trunk cards, such as the STM-64 card. The reserved

slots give the ONS 15454 SDH a practical maximum of ten G1000-4 cards. The G1000-4 card requires

the XC10G card to operate. For more information about the G1000-4 card specifications, see the Card

Reference chapter in the Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide.

The G1000-4 transmits and monitors the SDH J1 Path Trace byte in the same manner as ONS 15454

SDH cards. For more information, see the “Creating a Path Trace” section on page 6-19.

9.1.1 G1000-4 Application

Figure 9-1 shows an example of a G1000-4 card application. In this example, data traffic from the

Gigabit Ethernet port of a high-end router travels across the ONS 15454 SDH point-to-point circuit to

the Gigabit Ethernet port of another high-end router.

Figure 9-1 Data traffic using a G1000-4 point-to-point circuit

The G1000-4 card transports any layer three protocol that can be encapsulated and transported over

Gigabit Ethernet, such as IP or IPX, over an SDH network. The data is transmitted on the Gigabit

Ethernet fiber into the standard Cisco Gigabit Interface Converter (GBIC) on a G1000-4 card. The

G1000-4 card transparently maps Ethernet frames into the SDH payload by multiplexing the payload

onto an SDH STM-N card. When the SDH payload reaches the destination node, the process is reversed

and the data is transmitted from the standard Cisco GBIC in the destination G1000-4 card onto the

Gigabit Ethernet fiber.

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VC4-N

SDH

802.3x pause frames sent

to throttle down source

Gig-E

ONS 15454

SDH

ONS 15454

SDH

802.3x pause frames sent

to throttle down source

Gig-E

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