3.0 CONFIGURATION
3.0 CONFIGURATION
The Model 1186RC 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 configu-
rations.
3.1 CONFIGURE THE HARDWARE DIP SWITCHES
The 8 external dip switches are accessible from the underside of
the Model 1186RC (See Figure 2, below).
Figure 3 shows the orientation of the DIP switches in the “ON” and
“OFF” positions.
5
Figure 3.
Close-up of configuration switches
Figure 2.
Underside of Model 1186RC, showing location of the DIP Switches
Front
Rear
3.1.1 Configuration of Model 1186RC
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 1186RC.
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.
6
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 1186RC units are intended to work in pairs. When set-
ting the clock modes for the Model 1186RC units, one end of the link
must be set for Receive Recover and the other end must be set for either
Internal or Network.
}
}
Internal
Clock
HDB3
On
Off
