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C. Configuration Options
3160-A2-GB21-90 February 2001
C-13
Port Rate: 384
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Data Port Rate (appears when using the block or ACAMI channel allocation method, or
when a synchronous data port is assigned to another synchronous data port). Designates
the data rate for the port. Available selections depend on the current base rate configured
for the port. The factory default for Nx64 is 384 kbps, and Nx56 is 336 kbps.
NOTES:
– This configuration option does not appear if the individual channel allocation
method (Chan) is selected using the Assign By configuration option.
– Changing this configuration option from one rate to another deallocates all DS0
channels assigned to either the network interface or the DTE Drop/Insert (DSX-1)
interface.
– When you enable EDL (for 2-port and 4-port DSU/CSUs), 8 kbps of the total
bandwidth allocated for this port is not available to the synchronous data port. For
example, if you select 256 kbps and EDL is enabled, only 248 kbps are available.
– When you enable EDL (for 2-port and 4-port DSU/CSUs) on a synchronous data
port and the clock source is set to that synchronous data port, the external device
must provide a clock of 8 kbps less than the expected data port rate. For example, if
you select 64 kbps, the external clock source must supply a 56 kbps clock signal.
– For the 3164 DSU/CSU there is a hardware limitation that limits the combined
bandwidth used by Port 1 and Port 3 to a total of 2048 kbps and the combined
bandwidth used by Port 2 and Port 4 to 2048 kbps. Thus, when entering this menu,
the rate choices are limited due to this constraint. This limitation only occurs in
configurations mapping a port to a port or when mapping ports to the DTE
Drop/Insert (DSX-1) interface and to the network.
Table C-5. Data Port Channel Configuration Options (2 of 4)