Patton electronic 1186 user manual Configure the Hardware DIP Switches, HDB3

3.0CONFIGURATION

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).

Rear Front

On

S1

Off

Figure 2. Underside of Model 1186, showing location of the DIP Switches

Figure 3 shows the orientation of the DIP switches in the ÒONÓ and ÒOFFÓ positions.

ON

OFF

Figure 3. Close-up of configuration switches

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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.

Position	Function	Default Setting
S1	Clock Source	ON			Internal
				}
S2	Clock Source	ON			Clock
S3	Line	OFF
			}
						HDB3
S4	Coding	OFF
S5
S6	Reserved for Future Applications	OFF
S7
S8

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

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.

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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