Transport Overhead (Toh); Synchronous Payload Envelope (Spe); Table 1-1. Sts-1 Framing Structure - ADTRAN MX2800 STS-1 System Manual

MX2800 STS-1 User Manual

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.
61204659L1-1A

Table 1-1. STS-1 Framing Structure

TOH
Column
Rows 1 through 3
1 H1 H2 H3
2
3
4
5
6
7
8
9
1 H1 H2 H3
2
3
4
5
6
7
8
9
1 H1 H2 H3
2
3
4
5
6
7
8
9
1 H1 H2 H3
2
3
4
5
6
7
8
9
SPE
Column Columns
4 (POH) 5 through 90
J1
B3
STS-1
C2
Payload
G1
Region
F2
H4
Z3
Z4
Z5
J1
B3
STS-1
C2
Payload
G1
Region
F2
H4
Z3
Z4
Z5
J1
B3
STS-1
C2
Payload
G1
Region
F2
H4
Z3
Z4
Z5
J1
B3
STS-1
C2
Payload
G1
Region
F2
H4
Z3
Z4
Z5
Introduction, Section 1
STS-1 Overview
1-3