Model 3610 Installation2-133610-A2-GB41-70 July 1999Adding a TDM/Flex orMCMP/Flex to an InstalledModel 3610 DSUThis section describes the procedure for adding aTDM/Flex or MCMP/Flex upgrade for the Model 3610DSU.The time division multiplexer (TDM/Flex) ormultichannel multipoint (MCMP/Flex) upgrade for theModel 3610 (standalone) DSU includes a circuit card thatrests in an expanded base with an expanded rear panel.If this upgrade is to be installed on a DSU withfirmware version 6.3x or greater, each port (Port 1 orPort 2 for the 2-port version, or Ports 1 through 6 for the6-port version) can be configured independently tooperate as an EIA-232 or V.35 interface via the DCP, anasync terminal, or a 6700 or 6800 Series NMS.If the upgrade is to be installed on a DSU withfirmware version less than 6.3x, Switch S1 must bechanged to switch all ports from EIA-232 to V.35operation. Only the 6-port TDM/Flex or MCMP/Flex canbe used with DSUs with firmware version (DSU SW ver:)less than 6.3x; the 2-port TDM/Flex or MCMP/Flex is notsupported.If installing a 6-port TDM/Flex or MCMP/Flex andyour DSU has a wall-mount ac transformer, a table-toptransformer must be ordered (part number654-0099-0131).If connecting a port to data communications equipment(DCE), a crossover cable is required (feature number3211-178F for a V.35 Crossover Cable or feature number4951-035F for an EIA-232 Crossover Cable). For V.35operation, a V.35 adapter plug or V.35 adapter cable(feature number 3000-F1-510) is required for Ports 2through 6; the V.35 connector on the DSU is used forPort 1.Before disconnecting the DSU: Procedure1. Copy the applicable Configuration Worksheetfrom Appendix B.2. Access Stat (Status branch) and ID (Identitysubbranch).3. Record the unit’s serial number at the top ofPage 1 of the Configuration Worksheet.4. Access Confg (Configuration branch).5. Record the configuration option settings for eachoption set (DSU, Diag, etc.).If a DBM is installed, continue with:1. Record all Backup Directory entries.2. Record the unit’s local telephone number (Phone).For instructions and handling precautions for openingthe DSU, refer to the Hardware Straps and Changing theHardware Settings sections of this chapter.
