0x16 ISDN Secondary D Channel

Byte | AIB Field Description
--- | ---
2 | Address Element: 0x16
3 | Data Length: 0x07
4 | Data[0] Slot Number
5, 6 | Data[1, 2] Primary Logical Span ID (MSB, LSB)
7 | Data[3] Primary D Channel
8,9 | Data[4, 5] Secondary Logical Span ID (MSB, LSB)
10 | Data[6] Secondary D Channel

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.
Range of channels provided by T1 or E1 transmission service. A physical span is a group of channels taking up a single physical wire. A logical span is a group of channels taking up less than a single logical wire, or carried over more than one physical wire.
Most Significant Bit
Least Significant Bit
Data channel. One of two fundamental components of an ISDN interface, it provides a path (16Kbps for BRI, 64Kbps for PRI) for carrying control signals and call data in a packet-switched mode.