Description: This specifies data type supported by the CBR service.

unstructured(1) : This is also known as 'clear channel'. This service utilizes the entire T1 bandwidth. The switch does not look into the T1, but simply reproduces a stream of bits with clocking from the receiving port to the target port. structured(2) : This is also known as channelized T1 or cross-connect. This provides emulation point-to-point fractional T1(Nx64) connections. This aloows the T1 to break into multiple DS-0 channels towards different destinations. More than one circuit(AAL1) entity will share the same physical T1 interface. To provide this service, AAL1 is capable of delineating repetitive fixed-size blocks of data. The card limitations: - CESM-4P supports only Unstructured mode. - CESM-8P supports both structured and unstructured mode for T1/E1 - CESM-8P supports unstructured mode for T3/E3 - CESM-T3 supports only unstructured mode.