Prestige 861 VDSL Modem
Firmware Upload
6-3
data at a given time. When a port is in full-duplex mode, it can simultaneously send and receive data,
effectively doubling its throughput.
6.3.3 Flow Control
A concentration of traffic on a port decreases port bandwidth and overflows buffer memory causing packet
discards and frame losses.
Flow Control
is used to regulate transmission of signals to match the bandwidth
of the receiving port.
The Prestige uses IEEE802.3x flow control in full duplex mode and back pressure flow control in half duplex
mode.
IEEE802.3x flow control is used in full duplex mode to send a pause signal to the sending port, causing it to
temporarily stop sending signals when the receiving port memory buffers fill.
Back pressure flow control is typically used in half duplex mode to send a "collision" signal to the sending
port (mimicking a state of packet collision) when the receiving port memory buffers are full causing the
sending port to temporarily stop sending signals and resend later
6.4 Ethernet
Status
Syntax:
status ether
This command displays the current status of the Ethernet ports.
Figure 6-3 Ethernet Status Command Example
P861:/> status ether
ETHERNET:
Ethernet Port 1
Link Status: Down
Duplex: n/a
Speed: n/a
Flow Control: n/a
Ethernet Port 2
Link Status: Down
Duplex: n/a
Speed: n/a
Flow Control: n/a
Ethernet Port 3
Link Status: UP
Duplex: Full
Speed: 100M
Flow Control: Enable
Ethernet Port 4
Link Status: Down
Duplex: n/a
Speed: n/a
Flow Control: n/a
P861:/>
