5
Autonegotiation
Autonegotiation is a procedure in which the
switch automatically selects the operating
mode of its 10/100 RJ-45 ports. When a
connection is set up for the first time, the
switch detects the speed (10 or 100 Mbit/s)
and the transmission mode of the connec-
ted network (half duplex or full duplex).
Autocrossing
The SPIDER detects the transmit and recei-
ve pairs (MDI, MDI-X). The SPIDER automa-
tically configures its port for the correct
transmit and receive pins. Consequently it
does not matter whether you connect devi-
ces using a cross-over or straight cable.
1.3 SPECIFIC FUNCTIONS OF THE
F/O INTERFACE
Link control
The device
– SPIDER 1TX/1FX...
– SPIDER 4TX/1FX...
monitors the connected F/O line for inter-
rupts in accordance with IEEE standard
802.3 100BASE-FX.
Low Light Detection
If the optical input power decreases below
the low light threshold the transmit and
receive path will be disabled for data and
the idle signal will be transmitted.
Far-End Fault
The optical transmission distance of the
– SPIDER 1TX/1FX...
– SPIDER 4TX/1FX...
can be monitored in receiving direction as
well as in transmitting direction, if the other
side also supports Far-End Fault. If the other
side does not support Far-End Fault, the
optical transmission distance is monitored
only in receiving direction.
Far-End Fault is sent, if the optical input
power at the optical port has fallen under
the low light level. If Far-End Fault is re-
ceived, the link stays inactive (DA/STAT LED
dark).
1.4 FURTHER FUNCTIONS
AND FEATURES
Reset
The SPIDER will be reset by the following
action:
– input voltages fall below a threshold
After a reset the following action is carried
through:
– initialization
1.5 DISPLAY ELEMENTS
Equipment status
These LEDs provide information about
statuses which affect the function of the
entire SPIDER.
P – Power
(green LED)
– lit:
– supply voltage present
Port Status
These LEDs display port-related
information.
1. Functional description
The 10/100BASE-T(X) ports of an SPIDER
represent a terminal connection for the
connected LAN segment. You can connect
single devices or complete network
segments.
1.1 FRAME SWITCHING FUNCTIONS
Store and Forward
All data received by the SPIDER from the
system bus or at the ports are stored and
checked for validity. Invalid and defective
frames (> 1.522 byte or CRC error) as well
as fragments (< 64 byte) are discarded. The
SPIDER forwards the valid frames.
Multi address capability
A SPIDER learns all source addresses per
port. Only packets with
– unknown addresses
– addresses learnt at this port
– a multi/broadcast address
in the destination address field are sent to
this port.
A SPIDER learns up to 1,000 addresses. This
becomes necessary if more than one termi-
nal device is connected to one or more
ports. In this way several independent sub-
networks can be connected to an SPIDER.
Learnt addresses
An SPIDER monitors the age of the learned
addresses. The SPIDER deletes address
entries from the address table which exceed
a certain age (300 seconds).
Note:
Restarting deletes the learned
address entries.
Tagging
(IEEE 802.1Q)
The IEEE 802.1 Q standard designates the
VLAN tag to be included in a MAC data
frame for the VLAN and prioritizing func-
tions. The VLAN tag consists of 4 bytes (2
bytes tag protocol identifier TPID, 2 bytes
tag control information TCI). It is inserted
between the source address field and the
type field. Data packets with VLAN tag are
transmitted unchanged by the SPIDER.
1.2 SPECIFIC FUNCTIONS OF THE
TP/TX INTERFACE
Link control
The SPIDER monitors the connected TP line
segments for short-circuit or interrupt using
regular link test pulses in accordance with
IEEE standard 802.3 10BASE-T/100BASETX.
The SPIDER does not transmit any data to a
TP segment from which it does not receive
a link test pulse.
Note:
A non-occupied interface is assessed
as a line interrupt. The TP line to terminal
equipment which is switched off is likewise
assessed as a line interrupt as the de-
energised bus coupler cannot transmit link
test pulses.
Auto polarity exchange
If the receive line pair is incorrectly connec-
ted (RD+ and RD- switched) polarity is auto-
matically reversed.
DA/STAT – Data, Link status
(green LED)
– not lit:
– no valid link
– lit green:
– valid link
– flashes green: – data traffic
10/100 – Data rate
(yellow LED)
Twisted Pair Ports)
– leuchtet nicht: 10 Mbit/s link
– leuchtet yellow: 100 Mbit/s link
1.6 INTERFACES
10/100 MBit/s connection
– One port (port 2, SPIDER 1TX/1FX...)
– Three ports (port 1 to 3, SPIDER 3TX-TAP)
– Four ports (port 2 to 5, SPIDER 4TX/1FX...)
– Five ports (port 1 bis 5, SPIDER 5TX,
SPIDER 5TX EEC)
– Eight ports (port 1 to 8, SPIDER 8TX,
SPIDER 8TX EEC)
(10/100 Mbit/s, 8-pin R45 sockets) allow ter-
minal equipment or (depending on type) up
to eight independent network segments
complying with the standards IEEE 802.3
100BASE-TX / 10BASE-T to be connected.
These ports support autonegotiation, auto-
polarity and autocrossing.
– Pin configuration
of the RJ45 socket:
– 1 line pair: pin 3 and pin 6
– 1 line pair: pin 1 and pin 2
– remaining pins: not used.
Fig. 2: Pin configuration of an TP interface
100 Mbit/s connection (FX port)
The 100 MBit/s ports of the
– SPIDER 1TX/1FX...
– SPIDER 4TX/1FX...
supports the IEEE 802.3 100BASE-FX FDX
standard.
The devices
– SPIDER 1TX/1FX
– SPIDER 1TX/1FX EEC
– SPIDER 1TX/1FX-SM
– SPIDER 1TX/1FX-SM EEC
– SPIDER 4TX/1FX
– SPIDER 4TX/1FX EEC
– SPIDER 4TX/1FX-SM EEC
use a duplex SC connector,
the SPIDER 4TX/1FX-ST EEC uses a ST
connector.
The 100 MBit/s port allows one further DTE
or an optical network component to be
connected.
3pin terminal block
The supply voltage is connected via a 3pin
terminal block.
Note:
Terminal tightening torque of line binding
screws: 0.5 Nm
z
Warning!
The SPIDER devices are designed
for operation with a safety extra-low
voltage. Thus, they may only be
connected to the supply voltage
connections with PELV circuits or
alternatively SELV circuits with the
voltage restrictions in accordance
with IEC/EN 60950-1.
n.c.
Pin 8
n.c.
Pin 7
TD-
Pin 6
n.c.
Pin 5
n.c.
Pin 4
Pin 3
TD+
Pin 2
RD-
Pin 1
RD+
