Patton electronics 1186, Руководство пользователя, Страница: 4 / 11

3 3..0 0 C CO ON NF FIIG GU UR RA AT TIIO ON N
The Model 1186 is equipped with eight DIP switches, which allow
configuration of the unit for a wide variety of applications. This section
describes the switch location and explains all possible configurations.
3.1 CONFIGURE THE HARDWARE DIP SWITCHES
The 8 external dip switches are accessible from the underside of
the Model 1186 (See Figure 2, below).
Figure 3 shows the orientation of the DIP switches in the “ON” and
“OFF” positions.
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Figure 3. Close-up of configuration switches
Figure 2. Underside of Model 1186, showing location of the DIP Switches
Front
Rear
On
Off
3.1.1 Configuration of Model 1186
Switches S1 through S8 may be used to configure clocking modes
and line coding. Default settings of the switches are shown in the table
below. A description of the switch options follows the table.
Switches S1 and S2: Clock Mode
Use Switches S1 and S2 to determine clock mode of the 1186.
S1 S2 Setting Description
On On Internal Transmit clock generated internally
On Off Receive Recover Transmit clock derived from the line
Off On Network Transmit clock derived from G.703/G.704
equipment interface
Off Off Not Used Internal use only
Switch S3 and S4: Line Coding Options
Use Switches S3 and S4 to determine whether the G.703/G.704 line
coding is HDB3 or AMI (for older telecommunications equipment). The
line coding must be the same line coding prescribed by the NAP (Network
Access Provider). Most applications will use HDB3.
High Density Bipolar 3 (HDB3) : In HDB3 coding, the transmitter
deliberately inserts a bipolar violation when excessive zeros in the
data stream are detected. The receiver recognizes these special vio-
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Position Function Default Setting
S1 Clock Source ON
S2 Clock Source ON
S3 Line OFF
S4 Coding OFF
S5
S6
Reserved for Future Applications OFF
S7
S8
OFF
ON
S1
Note: The Model 1186 units are intended to work in pairs. When setting
the clock modes for the Model 1186 units, one end of the link must be set
for Receive Recover and the other end must be set for either Internal or
Network.
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Internal
Clock
HDB3