Boca NET-8, Installation Manual, Page: 19 / 56

19 19
19 19
19
* The “+” and “-” signs are used to represent the polarity of the
two wires that make up each wire pair.
NO NO
NO NO
NOTE: TE:
TE: TE:
TE: Eac Eac
Eac Eac
Each wir h wir
h wir h wir
h wire pair m e pair m
e pair m e pair m
e pair must be connected to the RJ-45 connector ust be connected to the RJ-45 connector
ust be connected to the RJ-45 connector ust be connected to the RJ-45 connector
ust be connected to the RJ-45 connectorsssss
in a specif in a specif
in a specif in a specif
in a specific or ic or
ic or ic or
ic orienta ienta
ienta ienta
ientation. Ref tion. Ref
tion. Ref tion. Ref
tion. Refer belo er belo
er belo er belo
er below to 3.3 Cr w to 3.3 Cr
w to 3.3 Cr w to 3.3 Cr
w to 3.3 Crosso osso
osso osso
ossov vv
vver Function f
er Function f
er Function f er Function f
er Function for or
or or
or
details. details. details. details. details.
3.3 Cr 3.3 Cr
3.3 Cr 3.3 Cr
3.3 Crosso osso
osso osso
ossov v
v v
ver Function er Function
er Function er Function
er Function
Two Ethernet 10Base-T devices can communicate only if the
transmitter on one device is connected to the receiver of the
other device. The 10Base-T specification suggests that the
crossover function be implemented in the concentrator itself.
On the BOCA NET-8, this crossover function is implemented in
all ports. However, the last port can be switched to straight-
through to simplify installation when cascading concentrators.
This switch is labelled “X” and located on the front of the
BOCA NET-8.
The BOCA NET-8 features internal cross-over for each port. So,
when a BOCA NET-8 port labelled with an “X” is connected to
a network card that does not feature internal crossover, then
straight-through wiring must be used.
When connecting two identical twisted-pair ports (that is, ports
that either BOTH support or NOT support the crossover
function), a crossover must be implemented in the wiring (see
3.5).
Cab Cab Cab Cab Cabling Characteristics ling Characteristics ling Characteristics ling Characteristics ling Characteristics
9370.p65 1/28/99, 2:57 PM 19