In addition to calculating HP IHIL I/O Module power requirements and available backplane slots, the utilization of the I/O distribution panel must be considered. The I/O distribution panel is a plate located at the back of the system box designed to simplify cable management. It is used to mount connectors (panel inserts) for communications and peripheral cables that connect the CPU to these devices. Options have panel inserts that come in two sizes for HP IHIL I/O Module: Size A: 2.5 cm by 10.1 cm, (1 in by 4 in); and Size B: 6.6 cm by 8.1 cm, (2.6 in by 3.2 in). The BA23 I/O distribution panel has space for two Size A inserts and four Size B inserts. An adapter place is included for converting two Size B inserts to three Size A in- serts. The BAl23 has space for ten panel inserts of which four are Size A and six are Size B. The HP IHIL I/O Module distribution panel has space for six Size A - inserts and 11 Size B inserts. Refer to the Configuring Charts in the Options chapter and in the Disks and Tapes chapter for the power requirements, bus loads, module size, and I/O distribution panel insert sizes for each option.