Byte | AIB Field Description
--- | ---
2 | Address Element: 0x01
3 | Data Length 0x01
4 | Data[0] Slot Number Front Of Chassis 0x00–0x0F Line Card Slots 0–15 0x10 Front Fan Tray 0x11 Power2/PSC2 0x12 Power1/PSC1 0x16 Fan Tray 0x20 CSP Matrix Series 3 Card for CPU1 0x21 CSP Matrix Series 3 Card for CPU2 Back Of Chassis 0x13 Midplane 0x14 CSP Matrix Series 3 Card I/O for CPU1 0x15 CSP Matrix Series 3 Card I/O for CPU2 0x16 Rear Fan Tray 0x30–0x3F Line Card I/Os

0x01 Slot

* Some API messages such as the Line Card Switchover message require two AEs as follows:

Byte | AIB Field Description
--- | ---
2 | Address Element: 0x01
3 | Data Length 0x01
4 | Data[0] Starting Slot Number
5 | Address Element 0x01
6 | Data Length 0x01
7 | Data[0] Ending Slot Number

Slot Numbering

The tables below show the slot numbering schemes for the front and back of the CSP chassis.

Front Slot Numbering, CSP

Front Slots | Power Cards | Line Cards | Matrix Cards | Fan Tray
Chassis Label | Power2 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | CPU2 | 0x16
Software (Hex) | 0x11 | 0x0F | 0x0E | 0x0D | 0x0C | 0x0B | 0x0A | 0x09 | 0x08 | 0X21 | 0x10
Chassis Label | Power1 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | CPU1 |
Software (Hex) | 0x12 | 0x07 | 0x06 | 0x05 | 0x04 | 0x03 | 0x02 | 0x01 | 0x00 | 0x20

Back Slot Numbering, CSP

Back Slots | Matrix I/Os | Redundant or Standby Line Card I/Os
Chassis Label | CPU1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
Software (Hex) | 0x14 | 0x30 | 0x31 | 0x32 | 0x33 | 0x34 | 0x35 | 0x36 | 0x37
Chassis Label | CPU2 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15
Software (Hex) | 0x15 | 0x38 | 0x39 | 0x3A | 0x3B | 0x3C | 0x3D | 0x3E | 0x3F

See Address Information Block.
The information in an AIB that follows the header, down to the data field. An AIB can have one or more Address Elements. AEs correspond to Span, Channel, and SS7 Link.