The statement that the cross-connect granularity is "GFor Any" is false. Tributary Sub-Network Connection Protection (SNCP) is configured to protect specific client-side services, such as E1, T1, or STM-1. These services correspond to specific Virtual Container (VC) granularities within the SDH frame structure, such as VC-12, VC-3, or VC-4. Therefore, the cross-connection for tributary SNCP must be configured with a specific granularity matching the service being protected. The terms "GF" and "Any" are not valid cross-connect granularities in this context.

A. This is a true statement. When configuring SNCP, you must specify the protection subtype, such as SNC/I (Sub-Network Connection with Inherent monitoring) or SNC/N (Sub-Network Connection with Non-intrusive monitoring), which defines how the path quality is monitored.

B. This is a true statement. Tributary SNCP operates on the principle of dual-feeding a signal from the electrical cross-connect unit to two separate tributary boards (or ports) and selectively receiving the signal from the active, non-faulty path.

C. This is a true statement. SNCP switching is triggered by specific fault conditions. These include hardware failures (such as a board being removed or failing, i.e., "cannot be detected") and signal integrity issues like Signal Fail (SF) and Signal Degrade (SD).

1. Huawei OptiX OSN 8800/6800/3800 Product Documentation

Feature Description

Section: Protection > SNCP.

This document details the principles of various protection schemes. The SNCP section explains that tributary SNCP uses a dual-feeding and selective-receiving mechanism at the cross-connect matrix to protect tributary services. It also lists the trigger conditions

which include hardware alarms (like BDSTATUS) and path-level alarms corresponding to SF and SD criteria.

2. Huawei OptiX OSN Equipment

Configuration Guide - Service Management

Chapter: Configuring SDH Services > Creating SNCP Services.

This guide provides the procedural steps for service configuration. When creating a tributary SNCP service

the configuration interface requires the user to select a specific service type and its corresponding signal granularity (e.g.

VC-12

VC-4). It does not provide an option for "GF" or "Any". The guide also shows the selection of an SNCP subtype (SNC/I or SNC/N) as a mandatory configuration parameter.