This attribute is a vector of three elements that indicate the quality
of service parameters for the forward direction for this connection.
This attribute is used for SPVC and SVC connections on a PNNI
interface.
The cdv element indicates the acceptable peak-to-peak Cell Delay
Variation (CDV) of real-time connections (CBR and rt-VBR).
The ctd element indicates the acceptable maximum Cell Transfer
Delay (maxCtd) of real-time connections (CBR and rt-VBR).
The clr element indicates the acceptable Cell Loss Ratio (CLR) of
CBR, rt-VBR, and nrt-VBR connections.