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Functional Description

Page 9 AM4311 User Guide

2. Functional Description

2.1 Uplink Infrastructure

The Uplink Infrastructure supports 4x 1000Base-X SFP uplink ports which are connected via a MUX to 8 AMC

ports.

The quad-lane 2:1 switch consists of four multiplexers and four demulti-plexers, one per lane. Each port is a

4-lane link, and each lane runs up to a 3.2 Gbps data rate independent of the other lanes. The lanes are

switched independently by setting control bits using an IPMI OEM command, according to Table 2.1.

The SFP Transceiver cages are designed according SFP MSA.

The IMPI OEM command to change the port mapping is described in Section 2.5.2.2 "OEM Set Control State".

This segmentation allows several combinations for specific usage. Configuration of all possible variation is

described in Section 2.5.3 "Configuring Port Settings".

Examples include:

AT8904M

• Base-Interface access on AMC port 0 and 1.

• Fabric-Interface access on AMC port 4 or 8.

AT8404M

• Base-Interface access on AMC port 0.

• Fabric-Interface link aggregation on AMC port P8, P9, P10 and P11

The default port assignment is listed in Table 2-2.

Table 2-1: Port Mapping

SFP Port Control Bit

0 1

SFP1 AMC P0 AMC P11

SFP2 AMC P1 AMC P10

SFP3 AMC P20 AMC P9

SFP4 AMC P4 AMC P8

Table 2-2: Default Port Assignment

SPF Port Port

SFP1 AMC P0

SFP2 AMC P1

SFP3 AMC P9

SFP4 AMC P8

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 47 48

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