VC3 Path Overhead

Normally, the default values of the overhead bytes to be received or transmitted are adopted to meet the relevant requirements. You need to configure the J1 or C2 byte in the VC3 path overheads, when the E3/T3 interface board on the local or opposite NE reports the LP_TIM or LP_SLM alarm or when the Ethernet board on the local or opposite NE reports the LP_TIM_VC3 or LP_SLM_VC3 alarm. You can query and set overhead bytes of the VC3 path in this user interface.

Navigation Path

In the NE Explorer, click the board and select Configuration > Overhead Management > VC3 Path Overhead from the Function Tree.

Radio Buttons

Radio button	Description
Display in Text Format	Enables the text format display of overhead bytes.
Display in Hexadecimal	Enables the hexadecimal display of overhead bytes.

Parameters

Field	Value	Description
Object	Equipment that supports the master and slave shelf management: NE name-shelf ID(shelf name)-slot number-board name-port number(port name)(-monitoring level) Equipment that does not support the master and slave shelf management: NE name-slot number-board name-port number(port name)(-monitoring level)	Displays the name of the operation object.
J1 to be Sent ([Mode] Content)	Default: [16 Bytes]HuaWei SBS	Sets the higher-order path overhead byte J1 to be sent. [Mode] indicates whether the overhead byte is of the single-byte mode, 16-byte mode or 64-byte mode. Object: VC3 path It is applicable to SDH line boards. The default value is usually used, but in the case of Huawei equipment interconnecting with third-party equipment, you need to set the same value as the J1 to be received at the opposite end. If the remote NE reports the LP_TIM or LP_TIM_VC3 alarm, set this parameter according to the J1 byte to be received at the remote NE.
J1 to be Received ([Mode] Content)	Default: [16 Bytes]HuaWei SBS	Sets the higher-order path overhead byte J1 to be received. [Mode] indicates whether the overhead byte is of the single-byte mode, 16-byte mode or 64-byte mode. Object: VC3 path It is applicable to SDH line boards. The default is usually used, but in the case of Huawei equipment interconnecting with third-party equipment, you need to set the same value as the J1 to be sent of the opposite end. When this parameter is set to Disable Mode, the board does not detect the received J1 byte.
C2 to be Sent	(0x00)Unequipped, (0x01)Reserved, (0x02)TUG Structure, (0x03)Locked TU-n, (0x04)34M/45M into C-3, (0x05)Experimental Mapping, (0x12)140M into C-4, (0x13)ATM Mapping, (0x14)MAN DQDB Mapping, (0x15)FDDI Mapping, (0x16)HDLC/PPP Mapping, (0x17) SDL with SDH Scrambler, (0x18)HDLC/LAPS Mapping, (0x19)SDL with Set-Reset Scrambler, (0x1A)10G Ethernet Frames, (0x1B)Flexible Topology Data Link, (0xCF)Reserved, (0xE1)Reserved, (0xFC)Reserved, (0xFE)O.181 Test Signal, (0xFF)VC-AIS	Sets the signal label byte C2 to be sent. Object: VC3 path It is applicable to SDH line boards. The default value is usually used, but when accessing signals of non-TUG structure (for example, ATM, FDDI), you need to set the C2 to be sent as required. If the remote NE reports the LP_TIM or LP_TIM_VC3 alarm, set this parameter according to the C2 byte to be received at the remote NE.
C2 to be Received	(0x00)Unequipped, (0x01)Reserved, (0x02)TUG Structure, (0x03)Locked TU-n, (0x04)34M/45M into C-3, (0x05)Experimental Mapping, (0x12)140M into C-4, (0x13)ATM Mapping, (0x14)MAN DQDB Mapping, (0x15)FDDI Mapping, (0x16)HDLC/PPP Mapping, (0x17) SDL with SDH Scrambler, (0x18)HDLC/LAPS Mapping, (0x19)SDL with Set-Reset Scrambler, (0x1A)10G Ethernet Frames, (0x1B)Flexible Topology Data Link, (0xCF)Reserved, (0xE1)Reserved, (0xFC)Reserved, (0xFE)O.181 Test Signal, (0xFF)VC-AIS	Sets the signal label byte C2 to be received. Object: VC3 path It is applicable to the SDH line board. The default is usually used, but when accessing signals of non-TUG structure (for example, ATM, FDDI), you need to set the C2 to be received as required. If the local NE reports the LP_TIM or LP_TIM_VC3 alarm, set this parameter according to the C2 byte to be transmitted from the remote NE.
C2 Received	For example: (0x00)Unequipped	Queries the signal label byte C2 received. The NE reports an alarm if it is different from the C2 to be received.
Input in Text Format	For example: HuaWei SBS	Enters the overhead bytes. When setting overhead bytes in text mode, use only ASCII characters.
Byte Mode	Single byte, 16-byte (first byte created automatically), 64-Byte Mode (With Synchronization Bit 0x0D/0x0A), 64-byte (without synchronization bit), Disable Mode	Sets byte mode for the overhead byte.