GarrettCom MAGNUM DS80F - Manual (Page 24)

Magnum DS80F & DS80C Dual-speed Stackable Hubs Installation and User Guide (05/04)
24
4.5 LED’s
PWR: Illuminates GREEN, steady on when power applied.
ERROR: Indicates the self-test at power up was not successful
SPEED:
Per port, ON = 100Mbps; OFF = 10Mbps (when LINK is made)
LINK/ACT: Per port, steady ON for LINK with no traffic, blinking indicates port
is transmitting and receiving.
F/H: (For full/half switched ports 1SW and 2SW only)
ON = Full-Duplex and Link, OFF = Half-Duplex and / or no Link.
4.6 Up-link Port
Magnum DS80F and DS80Cs have one manual crossover (MDIX up-link) switch,
port 1SW, on the front of the Personal Hub. This port can operate either Full/Half duplex
mode.
The up-link (or cross-over) on the #1SW( N-way auto-negotiating switched port)
allows its RJ-45 cable to connect for cascading to another hub or switch port. This allows
repeater-to-repeater connections without a special cross-over cable. Port 1SW works the same
as regular ports for 10Mbps or 100Mbps speed auto-sensing connections.
Cascaded connections may be operated at either 10 or 100Mbps speed. The
DS80F even supports cascaded connections of both 10Mbps and 100Mbps at the same time
on different ports. When attaching a 10Mbps hub, the Ethernet configuration rules (hop
count limits, etc.) for 10Mbps domains are in effect. When the cascaded connection is
operated at 100Mbps speed, because of its full duplex and switched port capability, does not
need any PDV calculation for distances. Two DS80F and DS80Cs cascaded using RJ-45
ports will auto-negotiate to operate the connection at 100Mb/s.
4.7 Use with Media Converters
Where an additional fiber connection (beyond the built-in fiber port as on D80F)
may be desired, a media converter may be used. For DS80F, the two switched ports can be
set to FDX manually, making typical 100Mb media converters (which can be troublesome
with auto-negotiating ports, defaulting to 100Mb half-duplex) usable in either HDX or FDX
mode as set by the user.
Whereas for DS80C the switched port 2SW at “FF” position supports 100Mbps
Full duplex fixed only which is useful for the fast ethernet media converter (e.g. Magnum
15E). If media converters are attached to ports 3 to 8, they will operate in HDX mode. It is
best to use only 10Mb media converters on ports 3 to 8.
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