Alaxala AX2200S Series Configuration Manual page 198

13 Ethernet
Settings on the remote
device
Method Interface
1000BASE-
T
full duplex
1000BASE-
T
full duplex
and half
duplex
10/100/1000
BASE-T
full duplex
and half
duplex
Legend N: A connection is not possible
(2) Auto-negotiation
Two connected devices use auto-negotiation to determine the connection conditions
(transmission speed, duplex mode (full or half), and whether to use flow control).
For details on the connection specifications for the Switch, see Table 13-11 Connection
specifications for transmission speed and duplex mode (full or half). Note that if the
connection conditions are not determined by auto-negotiation, the Switch attempts to
establish a connection until a link is established. (For details about this operation, see (6)
Down-shift functionality in 13.6.1 Functionality.)
(3) Flow control
The flow control functionality sends a pause packet to the remote device to instruct it to
temporarily stop sending frames so that received frames are not discarded when the
reception buffer on the switch is full. Conversely, when the switch receives a pause packet,
it regulates sending to the remote device. Note that flow control is available only in
full-duplex mode.
The Switch monitors the usage of the reception buffer, and sends a pause packet to the
remote device when sending on the remote device must be regulated. When the Switch
receives a pause packet, it regulates sending to the remote device. The flow control
settings for sending and reception are configured separately. Whether to enable or disable
flow control depends on these settings and the auto-negotiation result. When specifying
the flow control settings, make sure that the sending and receiving settings on the Switch
and the remote device do not conflict. For example, if you set
setting on the Switch, pause packet reception on the remote device must be enabled. For
details about how the operation mode is determined from the settings on the Switch and
remote device, see Table 13-12 Flow control for sending on the switch, Table 13-13 Flow
control for receiving on the switch, and Table 13-14 Flow control operation determined by
the auto-negotiation result.
176
Settings on the Switch
Fixed settings
10BASE-T 10BASE-T
half full duplex
duplex
N N
N N
10BASE-T N
half duplex
100BASE-TX 100BASE-TX
half duplex full duplex
N N
N N
100BASE-TX N
half duplex
on for the pause-packet send
Auto-
negotiation
1000BASE-
T
full duplex
1000BASE-
T
full duplex
1000BASE-
T
full duplex