[j-nsp] QPP PIC STM-1 channel capacity

[Daniel]

Hi everybody.. how do you guys read the following table..

http://www.juniper.net/techpubs/software/junos/junos60/feature-guide-60/html/fg-channelized-qpp2.html#1031725

where it says maximum per pic for STM-1 128... but then nxDS0.. 310.. 
pardon my ignorance but 310 is the max number of groups of DS0s right? and 
128 is the maximum number of interfaces per PIC? so in reality.. you can 
only have 128 nxDS0s right? 

Thanks

Daniel