Node Element Descriptor (NED)
The sequence number indicator field (bits 3-4 of the flags byte)
contains a code of X'01' to indicate that the sequence number in the
NED may not be the sequence number of the processor complex. The first
4 bytes of the sequence number field are used for nonsequenced number
purposes. See Table 1.
All FICON® CTC devices for every FICON CTC channel on a processor complex share the processor complex's sequence number; the last 7 bytes of which are stored in the last 7 bytes (bytes 23-29) of the sequence number field.
The information in bytes 18-21 and bytes 30-31 are needed to make FICON CTC devices NED-unique to an operating system.
Programs sending Read Configuration Data commands to either side of an FICON CTC device receive the same NED data.
The NED has the following format:
| Word | NED Format | ||||
|---|---|---|---|---|---|
| 0 | Flags | Type | Class | Reserved. | Level |
| 1 | Type Number | ||||
| 2 | Type Number (c) | Model Number | |||
| 3 | MN (c) | Manufacturer | |||
| 4 | Plant of Mfg. | Sequence Number | |||
| 5 | Sequence Number (c) | ||||
| 6 | Sequence Number (c) | ||||
| 7 | Sequence No. (c) | Tag | |||
- Flags
- X'C8'
- Type
- X'01'
- Class
- X'09'
- Reserved
- B'0000000'
- Level
- B'0'