P5200 View Datasheet(PDF) - Conexant Systems

Part Name

Description

Manufacturer

P5200

AccessRunner™ ADSL-USB Modem Device Set

Conexant Systems 

AccessRunner ADSL-USB Modem Device Set Data Sheet

2. System Description

2.1 General Description

The ADSL - USB modem solution hardware connects to the host PC via USB interface. The complete chipset and system

software is provided. The OEM adds a crystal circuit, EEPROM, RAM, LEDs, and other discrete components. All software to

support a full rate and/or G.lite ADSL modem is provided. Additionally, a control panel providing connection and system

status, an installation wizard providing automatic provisioning, a serial EEPROM programming utility, and a manufacturing

test program are provided.

2.1.1 Boot ROM and Power Up Procedure

The P5200 USB Interface Controller (UIC) contains a boot loader in internal ROM. Upon power up, the P52 UIC reads the

vendor specific USB descriptor information from EEPROM, and then enumerates with the host PC. EEPROM is required so

that USB descriptor information can be supplied during the enumeration process.

2.1.2 Serial EEPROM Programming Utility

The OEM-supplied serial EEPROM is required to store the USB device, configuration, interface, and endpoint descriptors. A

DOS-based EEPROM Programming Utility is available for the OEM to use to program the serial EEPROM with USB device,

configuration, interface, and endpoint descriptors. The USB device descriptors (including Vendor ID, Product ID, Device

Release Number, Manufacturer Name, Product Name, and Serial Number) can be customized as required.

2.2

2.2.1

ADSL Operation

ADSL Operating Modes

Full Rate ADSL Modes

Both T1.413 and G.992.1 (G.dmt) line coding schemes are supported for downstream rates up to 8 Mbps and upstream rates

up to 1 Mbps in 32 kbps increments. User selection of mode is supported through the provided control panel, however, auto-

provisioning is supported so that the appropriate modulation is automatically selected based on what is supported by the DSL

Access Multiplexer (DSLAM) at the Central Office. When operating in one of the full rate modes, the low and high frequency

bands must be separated with a filter. This can be done with either a service provider-installed splitter (known as “splittered

ADSL”), or with the use of distributed micro-filters in line with each POTS device on the circuit (known as “splitterless full-rate

ADSL”). Both deployment models are supported.

G.lite Splitterless Mode

G.992.2 (G.lite) splitterless mode is supported for downstream rates up to 1.5 Mbps and upstream rates up to 512 kbps in 32

kbps increments. User selection of mode is supported through the provided control panel, however, auto-provisioning is

supported so that the appropriate modulation is automatically selected based on what is supported by the DSLAM at the

Central Office. When operating in splitterless mode, the low and high frequency bands do not need to be separated with a

filter, and neither a service provider installed splitter, nor distributed micro-filters are required.

G.lite mode supports power management by defining a set of power management states for the link and the use of the

Embedded Operations Channel (eoc) to coordinate between the ATU-R and ATU-C.

LAN Mode

RFC-1483, bridged Ethernet over ATM, is supported in the LAN driver. This protocol provides LLC encapsulation for carrying

network interconnect traffic over a single ATM AAL5 Virtual Connection. LLC encapsulation is desirable when it is not

practical to have a separate VC for each carried protocol, such as with an ATM network that only supports Permanent Virtual

Circuits (PVCs). The provided NDIS 5 drivers automatically establish a “connection-less” call using the defined PVC, and

encapsulate Ethernet bridged frames.

WAN Mode

RFC-2364, PPP over ATM, is supported in the WAN driver. Point-to-Point Protocol provides a method of transporting multi-

protocol packets over point-to-point links. Point-to-point links allow for services such as Link Control Protocol, Network-layer

Control Protocol, and authentication. The PPP over ATM standard brings these point-to-point services to the ATM network

where they are not inherently supported. The provided NDIS 5 drivers accept an empty dial string on a specific “link” or PVC

from Windows Dial-up Networking to establish a call, and encapsulate PPP frames.

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