connections), optical fibres, etc. Based on the type of equipment, its location and distance from the master, these techniques can be used to transfer the management bus from the master to the slave. Routing of Management Buses Generally, management bus interfaces are of two types: maintenance interfaces and data interfaces. The cabling is planned in such a way that the connections from the master come from the maintenance interface while the outgoing signal uses the data interface. This is done because the maintenance interface is connected to the microprocessor of the equipment that needs the management instructions from the master. There are various topologies in which these interfaces can be connected for which NMS vendor instructions should be followed. Parameter Planning As shown in Figure 3.72, various parameters need to be defined for the management bus. This includes defining the addresses of the management bus. Along with the equipment, station and interface, the ID should be defined. The addressing scheme is based on the specifications given by the vendor. Another parameter that needs to be defined is the speed of the management bus, also called the baud rate. It should be noted that if a single management bus is connected to many equipments, then the lowest bit rate defines the speed of the whole bus. If the PCM is used to carry the management bits, then those bit numbers along with the TS carrying those bits should be defined, e.g. TS 31, bits 1 and 2. Parameter Planning Transmission Unit Group Setting Value/Operation Synchronization According to defaults Identifications Equipment ID According to plan/ ID (text) of the station identification TRUA equipment on this site. Service options Mgmt address 4080 or 4081 Displayed with (Physical address) command 6,1,2,0 Mgmt Bus baud rate 9600 bit/s Default:9600 bit/s Data hybrid Default: OFF O&M configuration Default: ON (local master) Data Channel Default: OFF Protection 2M settings / Use of data channel Default: Fixed 1 Default: Fixed 1 TS(0) settings DIR 1