User's Manual

Chapter 5: GlobeSpan Control Panel Application

GlobeSpan, Inc. Proprietary – Use Pursuant to NDA

CodingGain

Coding gain is the expected improvement, or gain, due to trellis/RS coding. It is used to

help determine the downstream connect rate. The larger the value of coding gain, the

more aggressive, i.e. higher, the selected rate will be. Note, however, that the CO

modem has the final say in the rate selection. Automatic coding gain selection is

recommended for automatic bit allocation depending upon line conditions. Otherwise,

requested coding gain is selectable from 0 to 7 dB in 1dB increments.

MaxBits/Bin

The maximum number of receive bits per bin can be selected.

TxStartBin

The lowest bin number allowed for the transmit signal can be specified.

TxEndBin

The highest bin number allowed for the transmit signal can be specified.

TxBinAdjust

Automatic bin adjustment can be enabled or disabled.

RxStartBin

The lowest bin number allowed for the receive signal can be specified.

RxEndBin

The highest bin number allowed for the receive signal can be specified.

RxBinAdjust

Automatic bin adjustment can be enabled or disabled.

Note: The allowable values for Tx/Rx start and end bins are as follows –

0x06-0x1f upstream

0x06-0xff downstream

This allows the customer to limit bins used for special configurations.

Exchange

For T1.413 only, Expanded Exchange Sequence (EES) can be short or expanded

exchange.

FrameOH

There are two types of framing defined per T1.413: full overhead and reduced

overhead. Each type has 2 versions thus resulting in four framing structures referred

to as 0, 1, 2, and 3. These framing structures are described in Table 4 of T1.413.

Clock Type

The design engineer can select either a crystal or an oscillator, but the transceiver

must be informed as to which has been chosen. Note that the default value is crystal.