为什么铁通的ADSL8M的也只开到6140

tx903

以下是线路质量
是不是完全正常
VPI:        0
VCI:        35
Broadband Mode Setting:        Multimode
Broadband Mode Auto-Detected:        ADSL2+
Downstream Speed:        6140 Kbps
Upstream Speed:        638 Kbps
Packets Received:        14642240
Retrains:        0
Retrain Timer:        000 Days, 02H:43M:48S
ATM QoS Class:        UBR
Near End CRC Errors Interleaved:        0
Near End CRC Errors Fastpath:        0
Far End CRC Errors Interleaved:        0
Far End CRC Errors Fastpath:        0
15 Minute Near End CRC Interleaved:        0
15 Minute Near End CRC Fastpath:        0
15 Minute Far End CRC Interleaved:        0
15 Minute Far End CRC Fastpath:        0
Near End FEC Interleaved:        0
Near End FEC Fastpath:        0
Far End FEC Interleaved:        0
Far End FEC Fastpath:        0
15 Minute Near End FEC Interleaved:        0
15 Minute Near End FEC Fastpath:        0
15 Minute Far End FEC Interleaved:        0
15 Minute Far End FEC Fastpath:        0
15 Minute Packets Discarded Downstream:        0
15 Minute Packets Discarded Upstream:        0
SNR Downstream Margin:        28.00
SNR Upstream Margin:        23.90
Attenuation Downstream:        20.90
Attenuation Upstream:        6.20