5.3 TWO-UNIT MODEL (ZERO LINE CAPACITY)
Like the single-server model, analytical results can be obtained for a two-server model of a server-to-customer spatially distributed queueing system. Moreover, a two-server model is the simplest model incorporating cooperative interaction (workload sharing) between servers. This type of interaction is generalized to N servers with the hypercube model (to be discussed in the next section).
The two-server model to be discussed here was originally analyzed in 1972 by Carter, Chaiken, and Ignall [CART 721, and by Larson and Stevenson [LARS 72].