B&B Electronics 316TX-N - Manual - Manual (Page 23)

(Revised 2010-7-30) 23
The N-Ring and 600 Series Ring filters are on the 308FX2 only, and are either enabled or disabled. The
command choice presented is the opposite of the current state.
After entering „bfilter‟, you will be asked to
“Enter ports that are to receive General Broadcast frames:”
Example of the Filters choices screen (308FX2 ONLY):
CLI\SWITCH>filters
/ (Go to top of menu tree)
? (Show menus/commands)
info (Get info on Filters)
dis_nring (Disable filters for N-Ring)
dis_ring600 (Disable filters for 600 series ring)
CLI\SWITCH\FILTERS>
Example of the Filters info screen (308FX2 ONLY):
CLI\SWITCH\FILTERS>info
N-Ring filter is Enabled. Ports 7 and 8 are ring ports.
600 series ring filter is Enabled. Ports 7 and 8 are ring ports.
CLI\SWITCH\FILTERS>
Ports
By default, the RJ45 ports are auto-sensing for speed, duplexing, and crossover or straight through wiring.
When you select ANY „forced‟ option, the auto-sensing for that port is disabled for all three parameters and
the „remaining‟ (unforced) options are set to 100 Mbits, Full Duplex, and straight through cabling. For
example, if you select speed10 for port 2, then port 2 will be: speed10, full duplex, and straight through
wiring. If you need „half duplex‟ also on port 2, you will have to select it also as auto-sensing will be
disabled for port 2 after you forced speed10. The FX ports are always 100 Mb, and Full Duplex.
Warning:
In a LAN it is best to set ALL devices at autonegotiate, OR to set ALL devices to the
same mode (speed/duplex).
If one end of a link is set to forced speed/duplex, but the other end is not forced, problems can be created.
Why do folks not trust autonegotiation? Many learned (mostly in past or on older equipment) not to trust
autonegotiation. Why? Many implementations were out before the spec was finalized, so did not play well
together. (We have seen a case where the wiring was cat3 and the devices autonegotiated to 100/full, but the
wiring would not support it.)
On the 308FX2, 309, 316, or 317, one can autonegotiate, or one can force to any of 4 modes: 100 full, 100
half, 10 full, or 10 half.
If you force one unit into 10/full, and leave another in autonegotiate (the default), the unit in autonegotiation
does not go into 10 full. It goes into 10 half. It gets no autonegotiation response. It easily senses speed
passively, but has no way to sense duplex mode and so uses the "safest" duplex mode - half. This is in
accordance with the IEEE specification. Thus, you have one unit at 10 full and the other at 10 half -