Telos Zephyr Xstream User Manual page 176

Channel Assignment:
DSU's for use with T1 or E1 will have a menu that determines which channel(s) should be
brought out (or aggregated and brought out) to each V.35 port. This will need to be set on each
end.
If you are using a fractiona1 T1 or E1 you will need to know which channels are active. The
Telco can give you that information.
USER'S MANUAL
Section 9: The V.35/X.21 Interface Option 164