ADTRAN MX2800 STS-1 - Synchronous Payload Envelope (SPE); Table 1-1. STS-1 Framing Structure; Transport Overhead (TOH)

MX2800 STS-1 User Manual Introduction, Section 1
STS-1 Overview
61204659L1-1A 1-3
Transport Overhead (TOH)
The first three columns are the TOH, which contains the overhead bytes for the Section and Line layers.
Section overhead is comprised of 9 bytes and Line overhead is comprised of 18 bytes.
STS-1 Synchronous Payload Envelope (SPE)
The SPE has 87 columns and 9 rows of bytes for a total of 783 bytes. Column 1 contains the STS Path
Overhead and has 9 bytes. The remaining 774 bytes are available for payload.
Table 1-1. STS-1 Framing Structure
TOH SPE
Rows
Column
1 through 3
Column
4 (POH)
Columns
5 through 90
1
2
3
4
5
6
7
8
9
H1 H2 H3 J1
B3
C2
G1
F2
H4
Z3
Z4
Z5
STS-1
Payload
Region
1
2
3
4
5
6
7
8
9
H1 H2 H3 J1
B3
C2
G1
F2
H4
Z3
Z4
Z5
STS-1
Payload
Region
1
2
3
4
5
6
7
8
9
H1 H2 H3 J1
B3
C2
G1
F2
H4
Z3
Z4
Z5
STS-1
Payload
Region
1
2
3
4
5
6
7
8
9
H1 H2 H3 J1
B3
C2
G1
F2
H4
Z3
Z4
Z5
STS-1
Payload
Region