Glossary B

Binding

In virtual cascaded payload configuration, designating one bind number to identify the VC4s of the same virtual cascaded payload is called "bind". If a fault occurs to one of the bound services, all bound services will switch as a whole. The bind ID is of 1-24 characters. On the same NE, the bind ID is unique. However, the bind IDs of the same virtual cascaded payload on the passed NE can be different.

Bit error alarm threshold

Bit error means that an error occurs to some bits in the digital code stream after being received, judged, and regenerated, thus damaging the quality of the transmitted information. When the bit error reaches a specific limit, the equipment will report the alarm. This limit is the bit error alarm threshold. The threshold can be divided into the crossing threshold and defect threshold.

Bound path

The VC Trunk refers to the 2M paths which are bound together to transmit the Ethernet data. The VC Trunk is an entity between the Ethernet port and the 2M path. It is introduced for the use of the routing and convergence functions in the future. Each ET1 has eight Ethernet ports and each ET1 board can be configured with up to 16 VC Trunks. The number of VC12s assigned to each VC Trunk are configurable. As in the networking application one ET1 board can provide 48 VC12s at most, one VC Trunk can be configured with up to 48 VC12s, with the corresponding bandwidth as 100M, of which the payload bandwidth is 90M. The specific configuration is dependent on the bandwidth that users need. On the same ET1 board, one VC12 can be assigned to only one VC Trunk.

Broadcast service

The unidirectional services from one service source to multiple service sinks are called the broadcast service. Since the tone interface provided by the TDA board does not contain such call and control signals as ringing current and signaling, it is only applicable to the semi-permanent connection between the equipment with the tone interface, either point-to-point private line connection or point-to-multipoint broadcast connection. Broadcast service is a wide application of the TDA board. For example, in a paging center, the TDA board is adopted to sent the signals to the TDA boards of other stations via fibers, and send the received signals to the wireless paging transmitters for further transmission.