Configuring Cpos Interfaces; Overview; Cpos Interfaces; Overhead Bytes - H3C SR6602-X Configuration Manual

Configuring CPOS interfaces

Overview

The low-speed tributary signals multiplexed to form an SDH signal are called channels. The
channelized POS (CPOS) interface makes full use of SDH to provide the following benefits:
•
Provides precise bandwidth division.
•
Reduces the number of low-speed physical interfaces on devices.
•
Enhances aggregation capacity.
•
Improves the access capacity of leased lines.

CPOS interfaces

The device supports the CPOS interfaces in
Table 1 CPOS interfaces
Interface type
CPOS E1
CPOS T1
High-speed CPOS
interfaces:
2.5 Gbps CPOS

Overhead bytes

SDH provides layered precise monitoring and management.
SDH monitoring functions are implemented using overhead bytes. SDH provides monitoring at
section and channel levels.
•
Sections are subdivided into regenerator and multiplex sections.
•
Channels are subdivided into higher-order and lower-order paths.
SDH provides a variety of overhead bytes, but only those involved in CPOS configuration are
discussed in this section.
SOH
The section overhead (SOH) is further classified into the regenerator section overhead (RSOH) and
the multiplex section overhead (MSOH).
The J0 regenerator section trace byte is included in RSOH to repeatedly send the section access
point identifier. The receiver uses this identifier to make sure it is in continuous connection with the
sender. This byte can be any character in the network of the same carrier. If the networks of two
carriers are involved, the sending and receiving devices at network borders must use the same J0
byte. With the J0 byte, carriers can detect and troubleshoot faults in advance or use less time to
recover networks.
POH
The payload of an STM-N frame includes the path overhead (POH), which monitors low-speed
tributary signals.
Table
Channelization/multiplexing capabilities
63 E1 channels (E1 channel configurable).
84 T1 channels (T1 channel configurable).
OC-48/OC-48c (STM-16)
37
1.