Huawei OSN 3500 SSN1EDQ41 4-Port Optical Interface Ethernet Double Domain Multiple Function Processing Board EDQ41 Function

OSN 3500 is a new-generation optical transmission system developed by Huawei. It adopts a unified switching architecture and can function as an MPLS/MPLS-TP-based packet device or a TDM device. When working with other devices of Huawei, OSN 3500 supports various networking modes, including the pure packet mode, hybrid networking (packet + TDM) mode, and pure TDM mode, achieving optimal processing for packet services and traditional SDH services. Thus, OSN 3500 efficiently transmits voice and data services over the same platform.

Version Description

The EDQ41 is available in one functional version, namely, N1.

Version Mapping

Board	Start Version
N1EDQ41	V200R011C00

Board Updates

This section describes the hardware updates in V200R013C30 and later versions as well as the reasons for the updates. Any product versions that are not listed in the document means that they have no hardware updates.

Application

The EDQ41 is mainly used for interoperation between the SDH network and the packet network. The board converges the TDM signals and Ethernet packets from the SDH access network and deconverges the TDM signals to the SDH ring and the Ethernet packets to the packet ring. In this manner, the board achieves the interoperation between the TDM domain and the packet domain, facilitating the smooth evolution of the network.

Figure 1 shows the typical networking and application of the EDQ41.

Figure 1 Networking and application of the EDQ41

The EDQ41 is applicable in five typical networking scenarios. Figure 2 shows the service signal flow in each application scenario.

Application 1: The EDQ41 receives EoS services from other NEs and then converts the EoS services to packet services, therefore implementing transition from the STM-1/STM-4 SDH network to the GE/10GE packet network.
Application 2: The EDQ41 receives EoS services from line boards on the same NE and then converts the EoS services to packet services, therefore implementing transition from the SDH network to the GE/10GE packet network.
Application 3: The EDQ41 board receives SDH services (including SDH services and EoS services) from SDH line board, processes and then distributes the services to GE/10GE packet networks and STM-1/STM-4 SDH networks.
Application 4: The EDQ41 board receives SDH services (including pure SDH services and EoS services) from SDH line boards, processes and then sends the services directly to the SDH network. In this case, the EDQ41 board functions like an SDH line board.

NOTE:

The EDQ41 supports the maximum processing capacity of 2.5 Gbit/s. Therefore, only 2.5 Gbit/s services of the services received from STM-N (1≤N≤64) line boards can be processed and sent to the packet network.

Figure 2 Service signal flow on the EDQ41

Functions and Features

EDQ41 boards process 4x155 Mbit/s or 4x622 Mbit/s SDH services and 2.5 Gbit/s EoS services at the same time.

As a dual-domain board, EDQ41 boards are applicable in the case of SDH services, packet services, and EoS services. Table 1, Table 2, and Table 3 provide the functions and features supported by EDQ41 boards in each service application scenario.

**Table 1** Functions and features supported by EDQ41 boards
Function and Feature	Description
Basic functions	Transmits and receives 4xSTM-1/STM-4 optical signals.
Port specifications	The STM-1 or STM-4 optical module can be used. When the STM-1 optical module is used, the standard S-1.1, L-1.1, and L-1.2 optical ports are supported. The optical ports comply with ITU-T G.957. When the STM-4 optical module is used, the standard S-4.1, L-4.1, L-4.2, and Ve-4.2 optical ports are supported. The optical ports of the S-4.1, L-4.1, and L-4.2 types comply with ITU-T G.957. The optical ports of the Ve-4.2 type comply with the standards defined by Huawei.
Optical module specifications	Supports the detection and query of the information about optical modules. Supports the usage and detection of SFP pluggable optical modules, facilitating the maintenance of optical modules. Provides the ALS function. The optical ports support the function of setting the on/off state of a laser.
Service processing	Supports VC-12/VC-3/VC-4 services when the STM-1 optical module is used. Supports VC-12/VC-3/VC-4/VC-4-4c services when the STM-4 optical module is used.
Overhead processing	Processes the section overheads of STM-4/STM-1 signals. Processes path overheads. Supports the setting and query of the J0, J1, and C2 bytes. Supports the ECC communication. NOTE: Ports 1 to 4 do not support the setting of lower order overhead bytes. That is, only port 5 supports the setting of lower order overhead bytes.
Loopback function	Supports inloops and outloops at optical ports. Supports inloops and outloops at the VC-4 level.
Alarms and performance events	Reports various alarms and performance events, which facilitates the management and maintenance of the equipment.
Protection scheme	Supports Two-fiber ring MSP. Supports Four-fiber ring MSP. Supports Linear MSP. Supports SNCP. Supports SNCMP. Supports SNCTP. Supports fiber-shared virtual trail protection.
Maintenance features	Supports warm resets and cold resets. Warm resets do not affect services. Supports the PRBS function in the line direction. Supports the alarm detection function and reports various alarms and performance events, which facilitates the management and maintenance of the equipment. Hot board swapping.

**Table 2** Packet features supported by EDQ41 boards
Function and Feature	Description
Basic functions	Bridges a maximum of 2.5 Gbit/s EoS services to the packet domain.
Format of service frames	Supports the encapsulation in IEEE 802.3 format, Ethernet II format, or IEEE 802.1q/p format. Supports a jumbo frame with a maximum length of 9600 bytes.
Maximum uplink bandwidth	2.5 Gbit/s
MFL for ports	Supports the query of the MFLs specified for ports but does not support MFL setting. The default MFL specified for ports is 9600 bytes.
MTU for services	Supports the setting of the packet length, which ranges from 64 bytes to 9600 bytes.
Type of Ethernet services	Supports point-to-point E-Line services. Supports multipoint-to-multipoint E-LAN services. NOTE: EDQ41 boards support only PW-carried E-Line and E-LAN services on the NNI side.
Number of supported E-Line services	When working with the N4GSCC: 4K When working with the N6GSCC: 8K
Number of supported E-LAN services	1K
HQoS	Supports service WRED policies, WFQ policies, V-UNI ingress policies, and V-UNI egress policies on the UNI side. Supports service WRED policies, WFQ policies, and PW polices on the NNI side.
Protection scheme	Tunnel APS	Supports 1+1 (single-ended/dual-ended) and 1:1 (dual-ended) tunnel APS in compliance with ITU-T Y.1720 and ITU-T G.8131. Number of supported tunnel APS protection groups: 1K
	PW APS	Supports the 1+1 (single-ended/dual-ended), 1:1 (dual-ended), and PW FPS (single-ended) PW APS in compliance with ITU-T Y.1720 and ITU-T G.8131. Number of supported PW APS protection groups: 1K
	LAG	Supports manual link aggregation. Supports the load non-sharing mode. Complies with IEEE 802.3ad.
	MC-LAG	Supported, which complies with IEEE 802.3ad.
Maintenance features	ETH OAM	Not supported NOTE: EDQ41 boards do not support creation of maintenance points but support transparent transmission of ETH OAM packets.
	Distributed MPLS OAM/Centralized MPLS OAM	MPLS tunnel OAM^a	Supports CV, FFD, BDI, FDI, Tunnel ping, and Tunnel traceroute. These functions comply with ITU-T Y.1711. Number of MPLS tunnels that support OAM: 2K
	Distributed MPLS OAM/Centralized MPLS OAM	MPLS PW OAM^a	Supports CV, FFD, BDI, FDI, PW traceroute, and PW ping. These functions comply with ITU-T Y.1711. The number of supported MPLS PW OAM is 2K.
	MPLS-TP OAM	MPLS-TP tunnel OAM^a	Supports CC, RDI, AIS, LB, LT, LM, 1DM, TST, LCK, and 2DM. These functions comply with ITU-T G.8113.1. Number of tunnels that support MPLS-TP OAM: 2K
	MPLS-TP OAM	MPLS-TP PW OAM^a	Supports CC, RDI, AIS, LB, LT, LM, 1DM, TST, LCK, CSF, and 2DM. These functions comply with ITU-T G.8113.1. Number of PWs that support MPLS-TP OAM: 2K
MSTP	Not supported
IGMP Snooping	Protocol enabling	Supported
	Port aging time	Supported
	Fast leave	Supported
	Discarding of unknown broadcast packets	Supported
	Static broadcast entry	Supported
NOTE: a: MPLS tunnel OAM, MPLS PW OAM, MPLS-TP tunnel OAM, and MPLS-TP PW OAM share OAM resources.

**Table 3** EoS data features supported by EDQ41 boards
Function and Feature	EDQ41
Basic function	Supports transparent transmission of Ethernet services.
Encapsulation format	Supports the GFP-F protocol.
EPL	Supports transparent transmission of PORT-based EPL services.
Number of VCTRUNKs	Binds a maximum of 62 VCTRUNKs, equivalent to 504 VC-12s, 48 VC-3s, or 16 VC-4s. Configuration features: The first eight VC-4s (including VC-3s and VC-12s in the VC-4s) and the last eight VC-4s (including VC-3s and VC-12s in the VC-4s) cannot be bound to the same VCTRUNK. Only 5th to 8th and the 13th to 16th VC-4s can bind VC-12 paths. In addition, VC-12s in the 5th to 8th VC-4s cannot be bound to the same VCTRUNK as the VC-12s in the 13th to 16th VC-4s. VCTRUNK1 to VCTRUNK8 each can be bound to a maximum of eight VC-4s. VCTRUNK9 to VCTRUNK63 each can be bound to a maximum of one VC-4, three VC-3s, or 63 VC-12s. A VC-4 cannot bind VC-3 and VC-12 paths at the same time. NOTE: VCTRUNK62 cannot be configured on the NMS.
LCAS	Dynamically increases or decreases the bandwidth and protects the bandwidth in compliance with ITU-T G.7042.
Test frames	Supports the transmitting and receiving of GFP test frames or Ethernet test frames.

Working Principle and Signal Flow

The EDQ41 consists of network processing module, encapsulation/mapping and SDH overhead processing module, clock module, logic control module, O/E converting module, SDH overhead processing module, and power module.

Figure 1 shows the functional block diagram of the EDQ41.

Figure 1 Functional block diagram of the EDQ41

Services in the SDH Domain

In the transmit direction: The O/E converting module converts the received STM-1/STM-4 optical signals into electrical signals and sends the electrical signals to the SDH overhead processing module. Then, the SDH overhead processing module extracts and processes the overheads, converts the signals into a format that applies to the backplane bus, and then sends the signals to the SDH cross-connect unit.
In the receive direction: The SDH overhead processing module inserts overhead bytes into the electrical signals from the SDH cross-connect unit, and sends the electrical signals to the E/O converting module. The E/O converting module converts the STM-1/STM-4 electrical signals into optical signals, and then sends the optical signal to fibers for transmission.

Services Transmitted from the SDH Domain to the Packet Domain

The mapping module demaps the signals from the SDH cross-connect module and compensates the delay of virtual concatenation. The mapping module decapsulates the packets through alignment and sends the data to the network processing module. The network processing module processes the data according to service types and configuration requirements, and then sends Ethernet services to the packet switching unit.

Services Transmitted from the Packet Domain to the SDH Domain

The network processing module processes the Ethernet services from the packet switching unit, and then sends the services to the mapping module. The mapping module encapsulates the Ethernet services in LAPS or GFP format and concatenates the services. Then, the mapping unit converts the Ethernet services into STM-16 signals and sends the signals to the SDH cross-connect unit.

Network Processing Module

The network processing module performs the functions at the MAC layer, including code conversion, Ethernet packet framing, CRC check, and Ethernet performance statistics. In addition, the network processing module classifies the services according to service types and configuration requirements. Then, the module encapsulates or decapsulates frames. The module supports the Ethernet/VLAN encapsulation formats.

The module supports the following functions:

Traffic detection and traffic classification
Unicast, multicast, and broadcast of flows
Priorities of data
Weighted fair queuing (WFQ) scheduling
Three service classes

Encapsulation/Mapping and SDH Overhead Processing Module

The encapsulation/mapping and SDH overhead processing module performs encapsulation/mapping functions and processes SDH overheads.

In the upstream direction, the mapping module encapsulates Ethernet signals in LAPS, GFP-F, or HDLC format and then performs concatenation. The module supports LCAS. Then, the mapping module converts Ethernet signals into SDH signals.
In the downstream direction, the mapping module demaps SDH signals and compensates the delay of virtual concatenation. The mapping module decapsulates packets accordingly through the alignment operation. The decapsulated data is finally transmitted to the network processing module.

Logic Control Module

The logic control module is connected to external circuits through the bus. The logic control module performs the following functions:

Manages and configures the other modules on the local board.
Implements inter-board communication through the internal Ethernet interface.

O/E Converting Module

In the receive direction, the O/E converting unit converts the received optical signals into electrical signals.
In the transmit direction, the O/E converting unit converts the received electrical signals into SDH optical signals and transmits the optical signals to optical fibers.
This module also detects the R_LOS alarm and provides the ALS function.

SDH Overhead Processing Module

The SDH overhead processing module includes the RST, MST, MSA, and HPT sub-modules. This module provides the inloop and outloop functions.

RST sub-module
- In the receive direction, the RST sub-module terminates the RSOH. That is, the RST sub-module detects the frame alignment bytes (A1 and A2), descrambles all the bytes except the first row of the RSOH, restores and checks the J0 byte, and checks the B1 byte.
- In the transmit direction, the RST sub-module generates the RSOH. That is, the RST sub-module writes bytes such as A1, A2, and J0, calculates and writes the B1 byte, and scrambles all the bytes except the first row of the RSOH.
MST sub-module
- In the receive direction, the MST sub-module terminates the MSOH. That is, the MST sub-module generates the MS_AIS or MS_RDI alarm after detecting the K2 byte. In addition, the sub-module generates the B2_SD or B2_EXC alarm after checking the B2 byte and sends the MS_REI alarm to the opposite end.
- In the transmit direction, the MST sub-module generates the MSOH. That is, the MST sub-module writes bytes such as E2, D4-D12, K1, K2, S1, and M1, and calculates and writes the B2 byte.
MSA sub-module
- In the receive direction, the MSA sub-module de-interleaves AUGs, divides an AUG into N AU-4s, detects the AU_LOP and AU_AIS alarms, and performs pointer justifications.
- In the transmit direction, the MSA sub-module adds the AU-PTR to a VC-4 to generate an AU-4. N AU-4s are multiplexed into an AUG through byte interleaving.
HPT sub-module
- In the receive direction, the HPT sub-module terminates the POH. That is, the HPT sub-module sends the HP_REI alarm to the opposite end after detecting byte B3. In addition, the sub-module generates the HP_TIM and HP_SLM alarms, and sends the HP_RDI alarm to the opposite end after detecting bytes J1 and C2 (the sub-module also generates the HP_UNEQ alarm if it detects the VC-4 path unequipped).
- In the transmit direction, the HPT sub-module generates the POH. That is, the HPT sub-module writes bytes such as J1 and C2, and calculates and writes the B3 byte.

Clock Module

The clock module traces the system reference clock and generates the required working clock for each chip.

Power Module

The power module converts the accessed DC voltage into the DC voltages that the modules of the board require.

Front Panel

The front panel of the EDQ41 has indicators, interfaces, a bar code, and a laser safety class label.

Diagram of the Front Panel

Figure 1 shows the front panel of the EDQ41.

Figure 1 Front panel of the EDQ41

Indicators

Board hardware status indicator (STAT) - two colors (red and green)
Service activation status indicator (ACT) - one color (green)
Board software status indicator (PROG) - two colors (red and green)
Service alarm indicator (SRV) - three colors (red, green, and yellow)

For the meanings of the indicators, see Alarm Indicators on the Boards.

Interfaces

The front panel of the EDQ41 has four optical interfaces. Table 1 lists the types and usage of the optical interfaces of the EDQ41.

**Table 1** Interfaces of the EDQ41
Interface	Type of Interface	Usage
IN1-IN4	LC (pluggable)	Receives the STM-1/STM-4 optical signals.
OUT1-OUT4	LC (pluggable)	Transmits the STM-1/STM-4 optical signals.

Valid Slots

The EDQ41 must be installed in a valid slot in the subrack. Otherwise, the EDQ41 fails to work normally.

EDQ41 can be housed in any of slots 4-8 and slots 11-14. The bandwidth of SDH services in all slots is 2.5 Gbit/s, and the bandwidth of packet services in all slots is 2.5 Gbit/s.

NOTE:

The EDQ41 cannot work with a cross-connect board whose logical board is configured as N1PSXCS.

Technical Specifications of the EDQ41

The technical specifications of the EDQ41 include the specifications of optical interfaces, mechanical specifications, and power consumption.

Specifications of Optical Interfaces

The EDQ41 supports the STM-1/STM-4 optical modules.

Table 1 lists the parameters specified for the optical interfaces of the EDQ41.

**Table 1** Specifications of the ports
Port type	Description
S-1.1	15 km STM-1 two-fiber bidirectional optical interfaces
L-1.1	40 km STM-1 two-fiber bidirectional optical interfaces
L-1.2	80 km STM-1 two-fiber bidirectional optical interfaces
S-4.1	15 km STM-4 two-fiber bidirectional optical interfaces
L-4.1	40 km STM-4 two-fiber bidirectional optical interfaces
L-4.2	80 km STM-4 two-fiber bidirectional optical interfaces
Ve-4.2	100 km STM-4 two-fiber bidirectional optical interfaces

Mechanical Specifications

The mechanical specifications of the EDQ41 are as follows:

Dimensions (mm): 25.4 (W) x 235.2 (D) x 261.4 (H)
Weight: 1.0 kg

Power Consumption

The maximum power consumption of the EDQ41 at room temperature (25°C) is 70 W.

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