Textron Greenlee Communications DataScout 10G, User Manual

Page: 30 / 115

28 Port Configuration
On power up the Tx Laser for A & B is ON, to turn OFF the Tx laser press the Menu
key and tap on SFP-A or SFP-B and press the Set SFP-A or B laser-Off button.
Auto-Negotiate
Auto-Negotiate enable two interfaces to determine common transmission parameters,
such as speed, duplex mode, and flow control. In this process, the connected devices
first advertise their capabilities regarding these parameters and then choose the high-
est performance transmission mode they both support, e.g. device #1 supports and
advertises (shares) 10/100/1000, Auto-Negotiate, Full Duplex and device #2 advertis-
es10/100, Auto-Negotiate, Full Duplex so the highest common parameter is 100M (de-
vice #2), Auto-Negotiate, Full Duplex Auto-Negotiate default is ON and is highlighted in
green. To turn off Auto-Negotiate simply tap the Auto-Negotiate button and note the
green bar in Auto-Negotiate button turns off.
Full and Half Duplex
In a half duplex (HDX) transmission, a data packet is sent by one system and received
by the other. Another data packet cannot be sent until the receiving system sends an
acknowledgement back to the sender. In a full duplex (FDX) transmission, both the
sending and receiving systems communicate with each other simultaneously; both de-
vices can send and receive data at the same time. This means a device can be receiv-
ing a data packet while acknowledging the receipt of another
.
10/100M supports both HDX and FDX, 1Gbps supports FDX only.
Flow Control
Flow control is used for temporarily stopping the transmission of data within an Ether-
net network. If Flow control is on and the transmission elements FIFO buffers are
close to overflow the network element can send a pause frame, which halts the trans-
mission of the sender for a specified period of time. Note that devices at each end
must be configured for Flow control on. Flow control is NOT supported in Half Duplex
(HDX) mode. The default setting is Flow Control ON; to turn off Flow Control tap the
Flow Control button and note the green bar extinguish.
Destination MAC address
The destination MAC address window is located under the configuration buttons. To
enter the destination MAC address tap on the MAC address and a key board will pop
up. Use the delete key to remove old destination MAC address and enter 12 alpha
numeric characters destination MAC address. The MAC address requires 12 charac-
ters with no dashes, e.g. 5044332211EE.