Patton electronics 1186RC User Manual

Contents

3.0 CONFIGURATION3.0 CONFIGURATIONThe Model 1186RC is equipped with eight DIP switches, whichallow configuration of the unit for a wide variety of applications. Thissection describes the switch location and explains all possible configu-rations.3.1 CONFIGURE THE HARDWARE DIP SWITCHESThe 8 external dip switches are accessible from the underside ofthe Model 1186RC (See Figure 2, below).Figure 3 shows the orientation of the DIP switches in the “ON” and“OFF” positions.5Figure 3. Close-up of configuration switchesFigure 2. Underside of Model 1186RC, showing location of the DIP SwitchesFront Rear3.1.1 Configuration of Model 1186RCSwitches S1 through S8 may be used to configure clocking modesand line coding. Default settings of the switches are shown in the tablebelow. A description of the switch options follows the table.Switches S1 and S2: Clock ModeUse Switches S1 and S2 to determine clock mode of the 1186RC.S1 S2 Setting DescriptionOn On Internal Transmit clock generated internallyOn Off Receive Recover Transmit clock derived from the lineOff On Network Transmit clock derived from G.703/G.704equipment interfaceOff Off Not Used Internal use onlySwitch S3 and S4: Line Coding OptionsUse Switches S3 and S4 to determine whether the G.703/G.704 linecoding is HDB3 or AMI (for older telecommunications equipment). Theline 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 transmitterdeliberately inserts a bipolar violation when excessive zeros in thedata stream are detected.6Position Function Default SettingS1 Clock Source ONS2 Clock Source ONS3 Line OFFS4 Coding OFFS5S6 Reserved for Future Applications OFFS7S8OFFONS1Note: 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 linkmust be set for Receive Recover and the other end must be set for eitherInternal or Network.}}InternalClockHDB3On Off