SEM910
Connectors
The RF connection on the SEM is the antenna on the top of the SEM910D. The antenna
connector is a reverse-TNC male type connector. An antenna may be connected directly to this
connector. Alternatively, an antenna may be located away from the SEM using RF cable to
connect the SEM to the antenna. Cirronet does not recommend using RF cables longer than 5
feet. If more distance is required between the SEM and the antenna Cirronet recommends using
the SEM910X/DX. If the SEM910X/DX is not used, high-quality, low-loss RF feed line must be
used.
The 10/100BaseT Ethernet connector is the standard RJ-45 connector located on the front of the
SEM910D and the rear of the SEM910. The SEM is set up to use a straight through cable to
connect to a PC. If a straight through cable is used to connect the SEM to other devices through a
hub, the SEM must be connected to the uplink port on the hub. Both a straight-through and a
crossover Ethernet cable are included.
The SYNC IN and SYNC OUT signals are provided for special applications where multiple
master SEMs are co-located. The synchronizing signals are RS-485 levels and may be connected
using an RJ-11 connector. If the sync signals are required, one of the master SEMs must be
designated as the sync master. See the section
SEM/Radio
Commands for details. If there are no
co-located master SEMs, sync should be left disabled.
The Console port is an RS-232 serial port that may be used to configure the SEM. Connection to
this port is made with the 9-pin to RJ-11 serial cable included with the SEM. This is useful when
the default IP address of the SEM cannot be used with the existing network preventing
configuration through a telnet session. See the section
Configuring the SEM
for details of using
this port.
The power connector is a 2-pin terminal block connector. The provided AC adapter provides a
12 volt power level to the SEM. The SEM can accept DC voltages ranging between 12VDC and
30VDC if alternative power supplies are to be used.
Status Indicators
The PWR indicator on the front panel indicates that power is applied to the SEM. The SEM does
not have a power switch. Power is applied and removed to the SEM by connecting and
disconnecting the power connector.
The Ethernet LEDs include LINK, TXD and RXD. The LINK LED lights when a valid Ethernet
connection is made. The SEM is set up to use a straight through cable to connect to a PC. TXD
and RXD are indicators of Ethernet data activity. They indicate the transmission and reception of
data over the Ethernet connection. Note that these LEDs can be active even when the SEM is not
communicating with another SEM.
On a slave SEM, the RF Link LED indicates the SEM has established a connection with the
master SEM. When a slave SEM is powered on, it will take a few seconds for this LED to turn
on. On a master SEM the RF Link LED is on as long as any one Slave is linked. On the X and D
models, the XCVR OK LED indicates that the remote radio assembly is connected and operating
properly.
©
2000- 2004 Cirronet
™
Inc
4
M-910-0003 Rev -
