Black Box LR120A, Руководство по началу работы

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Hardware installation 28
WAN Access Routers Getting Started Guide 3 • Initial configuration
Installing an interface cable on the Black Box LR122A’s V.35 interface port
The Black Box LR122A comes with a V.35 interface presented on a DB-25 female connector (see figure 10 ).
Figure 10. Rear view of the LR122A showing location of Ethernet and V.35 connectors
Note
The Black Box comes with a V.35 tail circuit cable. Use this cable to inter-
connect the Black Box’s V.35 port to a device configured as a DCE.
Figure 11. Connecting the LR122A to a DCE device
The serial port on the Black Box LR122A is configured as a DCE; it connects directly to a DTE using a stan-
dard straight-through V.35 cable.
However, in many applications, the Black Box’s V.35 interface will connect to a DCE (modem or multiplexer),
in this situation use the special cable provided with your LR122A. This DB-25/M35 cable presents the
LR122A’s V.35 interface as a DTE for direct connection to a DCE. (See
figure 11 .)
MDI-X
Crossover
10/100
Ethernet Power
MDI-X
Crossover
10/100
Ethernet
WA
N
X.21 Interface
V.35 Interface
Power
V.35 Interface connector
(DB-25)
Ethernet connector
(RJ-45)
2635 IPLink
Use cable provided
with 2635 IPLink
V.35
Modem
DCE
M DI-
X
Cro
sso
ve
r
10
/10
0
Eth
ern
et
W AN
X.2
1 In
terf
ace
Po
we
r