Cisco 1010 User Manual

CHAPTER

Cabling and Configuring the 25 Mbps Port Adaptor Modules

This chapter describes cabling and conﬁguration procedures for the LightStream 1010 ATM switch 12-port,25-Mbps PAMs. When yourswitch leavesthe factory, itis conﬁgured as speciﬁed inyour order and is ready for installation and startup. As your communication requirements change, you might want to upgrade your system, add components, or change the initial conﬁguration.

Software and upgrades require speciﬁc document part numbers and other frequently updated information; therefore, only basic software conﬁguration guidelines are included in this publication. Detailed, up-to-date instructions are included in the LightStream 1010 ATM Switch Software Conﬁguration Guide and command-line interface (CLI) command descriptions are provided in the LightStream 1010 ATM Switch Command Reference.

This chapter contains the following information:

• Overview of the 25-Mbps Port Adapter Module

• Connecting the Interface Cables and Checking the LEDs

• Conﬁguring the Interfaces

Overview of the 25-Mbps Port Adapter Module

The 25-Mbps Port Adapter Module has twelve 25.6 Mbps ATM ports. Each port is compliant with the ATM Forum PHY standard for 25.6 Mbps over twisted pair cable and is ideal for workgroup links (see Figure 9-1). Any of the twelve ports on the PAM can be conﬁgured as redundant links using the switch's routing protocols. The PAM has a 96-pin Molex connector and a multi-leg 12 RJ-45 cable assembly.

Cabling and Configuring the 25 Mbps Port Adaptor Modules 9-1

Overview of the 25-Mbps Port Adapter Module

Figure 9-1 25-Mbps PAM

ATM25-12 PORT

Each port on the PAM supports single, local clocking only. Trafﬁc-pacing allows the aggregate output trafﬁc rate on port group 0 to 5 or 6 to 11 to be

set to a rate below the line rate; this is useful when communicating with a slow receiver. Pacing cannot be done on any individual port but on a group of six ports.

The plug-and-play mechanisms of the LightStream 1010 allow the switch to come up automatically. All conﬁguration information for port adapter modules can be saved between hot swaps and switch reboots, while interface types are automatically discovered by the switch. This eliminates mandatory manual conﬁguration.

H8799

The LightStream 1010 supports any combination of port adapter modules. Customers can conﬁgure their switches with only the number and type of interfaces required, with up to 96 25-Mbps ports.

This section describes the following:

• 25 Mbps PAM Features

• 25 Mbps PAM Applications

9-2 LightStream 1010 ATM Switch PAM Installation Guide

25 Mbps PAM Features

The 25 Mbps PAMs provide the following features:

• Support for 12 ATM UNI ports at standard throughput rate of 25.6 Mbps full duplex.

• Compatible with ATM Forum 25.6 Mbps PHY speciﬁcation for UTP-3, UTP-5, or

STP-5 except that the RJ-45 connector is replaced with a Molex 96-pin female connector. (A cable assembly with 12 RJ-45 standard connectors is provided with the PAM.)

• A CPU bus interface for control and monitoring of the board ID EEPROM and LEDs.

• Priority queueing (4 levels) at each transmit (TX) output port.

• Buffermemory for transmit andreceive (RX) cells and for each group ofsixports; 128K

by 16-bit local external SRAM for ﬂexible queueing of 4,092 cells in transmit data path. The minimum queue allocations are selectable for each transmit queue priority from 4 to 60 cells, in multiples of 4, via software control.

• Support for multicasting to any combination of 12 transmit ports.

• Provides individual enabling for TX and RX of each port separately.

• Provides individual loopback control in each PMD device on board, via software

control.

Overview of the 25-Mbps Port Adapter Module

• Three 24-bit statistics counters per port for receive discarded cells, plus received and

transmitted cells.

• Can generate per-port and per-condition maskable interrupt to the CPU in case of

physical or line error conditions.

25 Mbps PAM Applications

The 25-Mbps port adapter module has 12 ports and is ideal for workgroup links. Figure 9-2 is an example of the 25-Mbps PAM application.

The various 25-Mbps PAMs provide 12 UTP-5 interface connections from the desktop to the wiring closet.

Cabling and Configuring the 25 Mbps Port Adaptor Modules 9-3

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