that cross-connects at DS- 3/STS-1 or higher rates and was developed to mitigate
the need for many pair-wise tie links needed for ring-hopping among many
ADMs in a given office. In fact, the value of a single B-DCS with multiple
interface cards with ports that act as single SONET ring nodes (called subtending
rings) was studied and recommended many years ago [6]. Basically, this reduced
multiple ADMs in a CO to just one equipment platform. However, the B-DCS
was not widely adopted in the metro networ k segment; consequently, although it
exists, we do not depict it in Figure 13.5. The reason for its limited deployment
was mostly because of overlap issues with regard to the W-DCS, which was
widely deployed prior to the advent of the B-DCS, and further ...