Zhone IMACS 8000 User Manual page 259

CPU Card
RATE
The Rate setting allows you to adjust the speed of the circuit according to the application
requirements. The only speed available for ports C1 to C4 is 64k (64 kbps). However, ports 1
to 64 can be set to either 56k or 64k.
MTU
The MTU needs to be 240 for 1x64 in order to communicate with the MCC. Since the MTU
is desired larger than that this needs to be a configurable option. Dependent on implementation
this can either be a number entered in a given range, or the selection from a predefined list of
fixed MTU sizes.
System Cards
IP Packet Routing
7-49