Configuration Switches (Model 2042Mt-Mc) - Patton electronics 2042 Series User Manual

2042MC-MT DIP SWITCH SUMMARY TABLE
Position Function
S1 Clock Source
S2 Clock Source
S3 Sync Method
S4 Sync Method
Switches S1 and S2: Clock Source
The setting for Switches S1 and S2 determines the source of the
HSSI Terminal Timing (TT) for the 2042MC-MT. With Switch S1 On
and S2 Off, the Model 2042MC-MT derives the HSSI Terminal Timing
from the ST signal provided by the HSSI DCE. With Switch S1 Off,
and S2 On, the RS-530 DTE provides TT to the HSSI DCE.
S1 S2 Description
Off Off Not a Valid Setting
Off On Terminal Timing Supplied by RS-530 DTE
device
On Off Terminal Timing supplied by HSSI ST signal
On On Not a Valid Setting
Switches S3 and S4: Synchronization Method
Switches S3 and S4 allow the Model 2042MC-MT to compensate
for timing delays when transmitting HSSI data at high speeds (greater
than 2.5 Mbps). At high bit rates, set Switch S3 On and Switch S4 Off.
In this setting, the RS-530 data will be synchronized to the SD timing
signal before conversion to HSSI. At lower bit rates (less than 2.5
Mbps), set Switch S3 Off and S4 On. In this setting, the RS-530 data
bypasses the synchronization circuit and is passed straight through to
the HSSI DCE.
S3 S-4 Description
Off Off Not a Valid Setting
Off On Data Skips Sync Circuit
On Off Data passes through sync circuit.
On On Not a Valid Setting
Factory Default
On
}
HSSI ST
Signal
Off
Off
}
Bypass
Sync Circuit
On
7

3.2 CONFIGURATION SWITCHES (MODEL 2042MT-MC)

The Model 2042MT-MC has miniature DIP switches that you may
use to configure the units. Each Model 2042MT-MC is factory config-
ured as DTE on the RS-530 end, and DCE on the HSSI end.
Therefore, the RS-530 end "wants" to plug directly into a DCE device.
Conversely, the HSSI end of the converter "wants" to plug directly into
DTE.
Please use this section to configure the internal DIP switches so
that the unit will work properly in your application. Figure 5 shows the
position of the DIP switches on the top side of the PC board.
OFF
Figure 5. The Model 2042MT-MC Assembly Drawing
Figure 6 shows the orientation of the Switches on DIP Switches S1
through S4 with respect to ON/OFF positions. The default settings for
DIP switch S1 are shown in the table on page . Detailed descriptions
of each switch follow the table.
ON
OFF
1 2
Figure 6. Close-up of DIP Switches Showing "ON" and "OFF" Positions
DIP Switches S1 - S4
ON
ON
3 4
8