Byte is allocated for user purpose to carry proprietary messages
The channel is terminated at each regenerator location
Data Communications Channel Bytes (D1/D2/D3)
Data Communications Channel (DCC)
D1, D2 and D3 together form a 192kbps message channel for OAM purposes
It can generate internal or external messages
It can also be used as a BER function
Pointers
AU Pointers Bytes (H1/H2/H3)
Enable transfer of STM-1 frames with STM-N frames and are processed by the MS terminating equipment
AU Pointer Byte
Line Layer / Multiplexer Section
B2 Byte (MS-BIP)
A 24-bit interleaved even parity code used to determine if transmission errors have occurred over the Multiplexer Section
Its calculated over all the bits of the STM-1 frame except those in the Regenerator Section overhead
The computed checksum is placed in the MSOH of the following STM-1 frame
K1 Byte (APS-Linear)
Used to activate and deactivate the switching between the main and protection paths on a multiplexer section
APS message type conforms to ITU-T G.783 and Bellcore GR.253 for Linear network architectures
Bits 1-4 (G.783 Protocol)
1111 Lockout of protection
1110 Forced switch
1101 Signal fail, high priority (1:n only)
1100 Signal fail, low priority
1011 Signal degrade, high priority (1:n only)
1010 Signal degrade, low priority
1000 Manual switch
0110 Wait to restore
0100 Exercise
0010 Reverse request (bidirectional systems only)
TX300S_e-manual_D07-00-064P_RevA00
Содержание VePAL TX300M
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