Exfo MaxTester DSL Bedienungsanleitung PDF herunterladen (Seite 38)

MaxTester DSL Test Results 32

³ Interleave Depth defines the number of bits (or bytes) in each block of

data.

³ Bitswap specifies the status of the bit swapping mechanism - Active, Not

Active or Unknown - swapping bits from tone m to tone n to prevent

modem retraining.

³ Trellis or Trellis Coded Modulation (TCM) is a type of convolutional code

which utilizes parity bits on each symbol within a continuous data stream.

When the line is connected, Trellis displays either On or Off.

³ Phy-R is Broadcom proprietary Physical Layer Retransmit technology which

is used to overcome impulse noise.

DSL Statistics

The DSL Statistics tab allows you to view transfer mode statistics and DSL counters.

³ DSL Counters lists the Local and Remote results for

the following counters:

³ CRC is the cyclical redundancy check

Interleaved/Fast counter.

³ FEC is the Reed Solomon forward error

correction.

³ FEC Seconds is the number of seconds when FEC

is detected.

³ Error Seconds is the number of seconds when

code violation is detected.

³ HEC is the header error check (HEC)

Interleaved/Fast counter. Available only in ATM

connection mode.

³ Parameter - Received/Transmitted

³ Bytes records the number of active (non-idle) PTM/ATM cells or frames on

a channel.

³ Packets displays the number of packets.

³ Transport Type options include PTM (packet transfer mode) and ATM

(asynchronous transfer mode).

³ Sync Loss Count is the number of times the unit lost synchronization.

³ PTMCRC is the number of CRC (cyclical redundancy check) errors of the PTM.

³ PTMCV is the number of CV (code violation) errors of the PTM.

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Exfo MaxTester DSL Bedienungsanleitung Seite 38