Lexmark T620 Technical Reference - Page 348

8-50 Interfaces Input Buffer Your printer has an input (link) buffer for each interface. The maximum size of the input buffer depends upon the amount of RAM memory installed. The input buffers serve the same purpose as a print spooler and can be allocated automatically by the printer. The size of the input buffer may be modified or disabled from the operator panel menus or through MarkVision Professional. If NPAP is active on a port, two-thirds of the buffer memory is reserved for NPAP and one-third is set aside for the input buffer. If NPAP is not active, all the memory is available for the input buffer. Table 8-8 shows the sizes automatically selected for the buffers when the buffer size is set to Auto in the menus. Table 8-8: Input Buffer Sizes in Bytes Memory Size Parallel Buffer Size Serial Network Buffer Size Buffer Size 2MB 12K 12K 12K 4MB 12K 12K 48K 6MB 24K 12K 48K 8, 10, or 12MB 48K 24K 48K 16, 18, or 20MB 48K (1MB if no optional 24K adapter is installed) 1MB 24, 28, 32, or 34MB 192K (1MB if no optional adapter is installed) 150K 1MB 36, 38, or 40MB 384K (1MB if no optional adapter is installed) 300K 1MB 44MB or larger 2MB 300K 2MB Note: MB represents 1,048,576 bytes. K represents 1024 bytes. N/A means non-applicable. LocalTalk 12K 12K 24K 48K 1MB 1MB 1MB 2MB USB 12K 12K 12K 24K 24K 150K 300K 300K Fax N/A 350K 350K 350K 1MB 1MB 1MB 1MB Note: When using serial communication, the printer signals the host computer to stop transmitting bytes when the serial input buffer is within 640 bytes. In addition, when XON/XOFF protocol is used, the printer signals the host computer to stop transmitting when the serial input buffer is 384, 256, and 128 bytes from full.