6
S4TEF10xx-11x
24-hour Technical Support: 1-800-260-1312 International: 00-1-952-941-7600
Installation — Continued
Switch set #2 - serial and ethernet options
6 - Twisted-pair Auto-Negotiation
Up
(Enabled)
- The media converter
“advertises”
ALL rate and mode capabilities to the network:
• 100 Mb/s full- or half-duplex
• 10 Mb/s full- or half-duplex
The media converter brings up the Ethernet link to
the highest speed and mode possible for all the
attached network devices.
When selected, Auto-Negotiation allows a twisted-pair link to become operational only
after the Auto-Negotiation function matches network speed capabilities at both ends of
the twisted-pair copper segment.
down
(Disabled)
- The bridging media converter does not “advertise” the rate and
mode capabilities to the network. Switch 7 and switch 8 are then used to set the speed
and mode for the Ethernet link.
Note:
Switch 7 and 8 are inactive if switch 6 is enabled
(up)
.
7 - Ethernet speed
up
(100Base-TX)
- Sets the Ethernet port to
100Base-TX
(100 Mb/s)
.
down
(10Base-T)
- Sets the Ethernet port to
10Base-T
(10 Mb/s).
8 - Ethernet node
up
(Full-Duplex)
- Sets the Ethernet port to full-duplex mode. The twisted-pair cable
distances are constrained by the cable requirements
(see pages 1 and 2 for the cable
specifications for the various S4TEF10xx-11x models).
down
(Half-Duplex)
- Sets the Ethernet port to half-
duplex mode. The twisted-pair cable distances are
constrained by the 512-bit rule:
In a half-duplex network, the maximum cable
lengths are determined by the round trip delay
limitations of each Fast Ethernet collision domain.
(A collision domain is the longest path between any
two terminal devices, e.g. a terminal, switch, or
router.)
The 512-bit rule determines the maximum length of cable permitted by calculating the
round-trip delay in bit-times (BT) of a particular collision domain. If the result is less
than or equal to 512 BT, the path is good.
For more information on the 512-bit rule, see the white paper titled “Collision
Domains” on the Transition Networks website at: www.transition.com.
up
down
Ethernet Speed = 100 Mb/s
Ethernet Speed = 10 Mb/s
7
up
down
Full-Duplex
Half-Duplex
8
Enable Auto-Negotiation
Disable Auto-Negotiation
6
up
down
7
[email protected] -- Click the “Transition Now” link for a live Web chat.
10 - Fiber Loop-Back
Up - Disable fiber loop-back.
Down - Enable fiber loop-back.
The loop-back setting is used for installation and
network debugging procedures. When the fiber
loop-back function is enabled, the fiber port loops
all T1/E1 and Ethernet signals from the receive
port back to the transmit port. The fiber loop-
back test scenarios are described in detail on page 18.
Enables Loop-Back
Disables Loop-Back
10
up
down
Installation -- Continued
Switch set #2 - serial and ethernet options
9 - Transparent Link Pass-Through
Up - Enable Link Pass-Through
Down - Disable Link Pass-Through
The Transparent Link Pass-Through feature allows the media converter to monitor the
Ethernet copper RX
(receive)
ports for loss of signal. For example, when the Ethernet
copper link on the near end device is lost (1), the local media converter transmits a
signal to the remote media converter (2), thus, “passing through” the link loss. The
remote media converter disables the Ethernet copper link to the far-end device (3),
which prevents the loss of valuable data unknowingly transmitted over an invalid link.
It is important to remember that, although the Ethernet copper link has been disabled,
the fiber link is still valid (4). Thus, there is no disruption to the transfer of T1/E1 or
RS-232 data signals over the fiber link.
3
1
Local
Media
Converter
Remote
Media
Converter
Near-End
Device
Far-End
Device
original fault on the
Ethernet copper link
remote converter disables
the Ethernet copper link
local converter sends a
loss signal over the fiber link
2
fiber link is still valid
4
Enable Link Pass-Through
Disable Link Pass-Through
9
up
down
