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C-13
3160-A2-GB21-80
March 1999
Table C-5. Data Port Channel Configuration Options (2 of 4)
Port Rate: 384
Next 64 128 192 256 320 384 448 512 576 640 704 768
832 896 960 1024 1088 1152 1216 1280 1344 1408 1472 1536
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OR
Next 56 112 168 224 280 336 392 448 504 560 616 672
728 784 840 896 952 1008 1064 1120 1176 1232 1288 1344
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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.