Huawei OSN 3500 PEX1 SSN2PEX1 N2PEX1 Application

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 PEX1 is available in N1 and N2. The N1PEX1 is discontinued.

Table 1 describes the versions of the PEX1.

Table 1 Versions of the PEX1

Item	Description
Functional versions	The PEX1 is available in two functional versions, namely, N1 and N2.
Differences	Regarding interface specifications: interface types, working modes, unidirectional-mode setting. Regarding service specifications: tunnel specifications, Ethernet service capability. Regarding protection schemes: MPLS PW APS, MC-LAG. Regarding clock synchronization: IEEE 1588v2. Regarding maintenance features: distributed MPLS OAM/centralized MPLS OAM, MPLS-TP OAM, loopback capability. Regarding other points: The N1PEX1 occupies two slots, but the N2PEX1 occupies only one slot. Therefore, the N1PEX1 and N2PEX1 boards cannot be used interchangeably.
Substitution	None

Version Mapping

Board	Start Version
N1PEX1	V100R009C03
N2PEX1	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.

Hardware Updates in V200R015C30

Type	Description
Add	N2PEX1 new add the function "ETH-TRUNK".
Add	N2PEX1 new add the function "LLDP(Link Layer Discovery Protocol)".

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.

Hardware Updates in V200R015C30

Type	Description
Add	N2PEX1 new add the function "ETH-TRUNK".
Add	N2PEX1 new add the function "LLDP(Link Layer Discovery Protocol)".

Functions and Features

PEX1 boards process and forward 1x10 Gbit/s Ethernet services and support QoS functions such as traffic management, congestion control, and queue scheduling for data packets.

Table 1 lists the functions and features supported by PEX1 boards.

Table 1 Functions and features supported PEX1 boards

Function and Feature		Description
Basic functions		Receives/Transmits and processes 1x10 GE services.
Port types		N1PEX1 supports 10GBASE-LR (LAN), 10GBASE-LW (WAN), 10GBASE-ER (LAN), 10GBASE-EW (WAN), 10GBASE-ZR (LAN), and 10GBASE-ZW (WAN) Ethernet optical ports. The optical ports use LC connectors and support the transmission distances of 10 km, 40 km, and 80 km. N2PEX1 supports 10GBASE-LR (LAN), 10GBASE-ER (LAN), and 10GBASE-ZR (LAN) Ethernet optical ports. The optical ports use LC connectors and support the transmission distances of 10 km, 40 km, and 80 km. N2PEX1 supports CWDM and DWDM colored optical ports. The optical ports use LC connectors. CWDM optical ports support the transmission distance of 70 km. DWDM optical ports support the transmission distance of 40/80 km.
Functions when being used with an interface board		A PEX1 board does not support an interface board, and provides one 10GE port on the front panel.
Port characteristics	Pluggable optical module	Supports XFP optical modules.
	Single-fiber bidirectional optical module	Not supported
	Working modes	N1PEX1 boards support 10GE full-duplex in both LAN (default) and WAN mode. N2PEX1 boards support 10GE full-duplex in LAN mode.
	Flow control at ports	Auto-negotiation mode: not supported
		Non-autonegotiation mode: not supported by N1PEX1 boards but supported by N2PEX1 boards
	Query/Setting of port status	Supported
	Query of port types	Supported
	Query/Setting of optical power thresholds	Supported
	Query/Setting of unidirectional-mode	Not supported by N1PEX1 boards but supported by N2PEX1 boards
Service specifications	Processing capability	Processes 10 Gbit/s services in full-duplex mode.
	Service bearing modes	MPLS: supported
		QinQ: supported
		Port: supported
	PW specifications	Maximum number of PWs: 16K
		Maximum number of MS-PWs: 8K
	Tunnel specifications	Number of unidirectional MPLS tunnels (with tunnels shared): N1PEX1: 4K N2PEX1: When working with the N4GSCC: 4K When working with the N6GSCC: 16K
		Number of bidirectional MPLS tunnels (with tunnels shared): N1PEX1: 2K N2PEX1: When working with the N4GSCC: 2K When working with the N6GSCC: 8K
	MFL for ports	Supports the setting of the packet length, which ranges from 960 bytes to 9600 bytes. After the setting becomes valid, the length of the packets that enter or exit the ports is restricted by the preset MFL.
	MTU for services	For packet services carried by PWs, N1PEX1 boards support the setting of the packet length, which ranges from 64 bytes to 9600 bytes. For packet services carried in other modes, N1PEX1 boards support the setting of the packet length, which ranges from 64 bytes to 9600 bytes. For packet services carried by PWs, N2PEX1 boards support the setting of the packet length, which ranges from 64 bytes to 9600 bytes. For packet services carried in other modes, N2PEX1 boards do not support the setting of the packet length.
	Ethernet service capability	E-Line service: supported Number of supported E-Line services: When working with an N4GSCC board: 4K When working with an N6GSCC board: 8K
		E-LAN service: supported Number of supported E-LAN services: 1020 Number of static MAC addresses in E-LAN services: 2K
		E-AGGR service: supported An N1PEX1 board supports four E-AGGR services, each of which supports 127 leaf ports. An N2PEX1 board does not support E-AGGR services.
	Formats of Ethernet data frames	Supports the encapsulation in IEEE 802.3 format, Ethernet II format, or IEEE 802.1q/p format.
	Maximum number of QinQ links	1K
	Jumbo frame	Supports a jumbo frame with a maximum length of 9600 bytes.
Protection schemes	Tunnel APS	Supports the 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. When working with an N4GSCC board: 1K When working with an N6GSCC board: 4K
	PW APS	Supports the 1+1 (single-ended/dual-ended), 1:1 (dual-ended) PW APS and PW FPS (single-ended) PW APS (only on N2PEX1 boards). Supports a maximum of 1K PW APS protection groups, and a PW protection group can bind a maximum of 512 members (only on N2PEX1 boards) in compliance with ITU-T Y.1720 and ITU-T G.8131. NOTE: PW APS and tunnel APS share the protection resources.
	MRPS	N1PEX1 not support MRPS. Supports MRPS(only on N2PEX1 boards): Protection group type: two-fiber bidirectional Switching type: wrapping switching
	LAG	Supports manual link aggregation and static link aggregation. Supports the load sharing mode and load non-sharing mode. Complies with IEEE 802.3ad and IEEE 802.1AX.
	MC-LAG	Supported only on N2PEX1 boards, which complies with IEEE 802.3ad and IEEE 802.1AX.
	MSTP	Supported only on N2PEX1 boards, which complies with IEEE 802.1s.
	LPT	Point-to-point LPT: supported
		Point-to-multipoint LPT: supported
	ETH-TRUNK	N2PEX1 Supported
Synchronization	Synchronous Ethernet Clock	Supports one channel of synchronous Ethernet clock signals.
	1588v2	Supports one channel of the IEEE 1588v2 time synchronization and clock synchronization (only on N2PEX1 boards).
Maintenance features	ETH OAM	Ethernet Service OAMa: Supports CC, LB and LT. These functions comply with IEEE 802.1ag. Supports LM and 2DM. These functions comply with ITU-T Y.1731. Number of services that support Ethernet OAM (ETH OAM): 2K
		Ethernet Port OAMa: Supports OAM auto-discovery, remote loopback, fault detection, and link performance monitoring. These functions comply with IEEE 802.3ah. Number of ports that support ETH OAM: 2K NOTE: N2PEX1 boards do not support remote loopbacks.
	Distributed MPLS OAM/Centralized MPLS OAM NOTE: N1PEX1 boards support only distributed MPLS tunnel OAM.	MPLS tunnel OAMa: 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
		MPLS PW OAMa: Supports CV, FFD, BDI, FDI, PW traceroute, and PW ping. These functions comply with ITU-T Y.1711. Number of PWs that support MPLS PW OAM: 2K.
	MPLS-TP OAM NOTE: Only N2PEX1 boards support MPLS-TP OAM.	MPLS-TP tunnel OAMa: Supports CC, RDI, AIS, LB, LT, LM, and 2DM. These functions comply with ITU-T G.8113.1. Number of tunnels that support MPLS-TP OAM: 2K
		MPLS-TP PW OAMa: Supports CC, RDI, AIS, LB, LT, LM, and 2DM. These functions comply with ITU-T G.8113.1. Number of PWs that support MPLS-TP OAM: 2K
	Loopback capability	PHY layer at Ethernet ports: N1PEX1: Supports inloops and outloops. N2PEX1: Not support loopbacks.
		MAC layer at Ethernet ports: N1PEX1: Supports inloops. N2PEX1: Supports inloops and outloops.
	RMON	Supported
	Port Mirroring	Supports port mirroring (N2PEX1).
Inband DCN		Supported
LLDP		N2PEX1 Supported
HQoS		Supports service WRED policies, WFQ policies, PW polices, QinQ polices, V-UNI ingress policies, V-UNI egress policies, port policies, port shaping.
IGMP Snooping	Protocol enabling	Supported
	Port aging time	Supported
	Fast leave	Supported
	Discarding of unknown broadcast packets	Supported
	Static broadcast entry	Supported
Query of electronic labels		Supported
NOTE: a: MPLS tunnel OAM, MPLS PW OAM, MPLS-TP tunnel OAM, MPLS-TP PW OAM, and ETH OAM share OAM resources.

Working Principle and Signal Flow

The PEX1 consists of the network processing module, transmission management module, switching network buffering module, CPU management module, logic control module, temperature and voltage detecting module, clock module, and power module.

Figure 1 shows the functional block diagram of the PEX1.

Figure 1 Functional block diagram of the PEX1

Receive Direction

The network processing module receives the 10xGE optical signals, decodes the signals, and converts the serial signals into parallel signals. Then, the network processing module performs route searching or address matching for the data packets, and transmits the corresponding packets to the transmission management module. The transmission management module buffers and grooms the packets, slices the packets into cells that the switching network requires, and sends the cells to the switching network buffering module. The switching network buffering module buffers the cells and sends the cells to the cross-connect unit.

Transmit Direction

The switching network buffering module processes the cells sent by the cross-connect unit and sends the cells to the transmission management module. The transmission management module rearranges the cells to form packets, performs buffering and QoS management for the packets, and sends the packets to the network processing module. The network processing module converts the parallel signals into serial signals and sends the signals to the 10xGE optical interface.

Network Processing Module

The network processing module performs route searching, address matching, and other functions for data packets. The network processing module of the PEX1 can process the 10 Gbit/s data packets in full-duplex mode.

Transmission Management Module

The transmission management module slices packets into cells, and performs QoS management and large volume buffering for the cells.

• QoS management: The transmission management module provides the scheduling function at five levels including the flow queue and port queue, the bandwidth restricting function, and the corresponding statistical information.
• Large volume buffering: The transmission management module supports traffic of 10 Gbit/s and can buffer data for 17 ms in both the upstream direction and downstream direction.

Switching Network Buffering Module

The switching network buffering module performs cell buffering, queue management, scheduling, and other functions. This module and the cross-connect unit form a three-level switching network to switch cells.

CPU Management Module

The CPU management module provides the parallel management bus, Ethernet bus, and other buses to manage the modules of the PEX1. The CPU management module also monitors alarms and performance events and reports the alarms and performance events to the SCC unit.

Logic Control Module

The logic control module controls the logic of the PEX1.

Temperature and Voltage Detecting Module

The temperature and voltage detecting module monitors the temperature and voltage.

Clock Module

The clock module performs the following functions:

• Provides the clock signal for each module of the PEX1.
• Supports the IEEE 1588v2 clock.
• Supports the synchronous Ethernet clock.

Power Module

The power module converts the accessed DC voltage into the DC voltages that the modules of the PEX1 require.

Front Panel

The front panel of the PEX1 has indicators, an interface, a bar code, and a laser safety class label.

Diagram of the Front Panel

Figure 1 shows the appearance of the front panel of the N1PEX1.

Figure 1 Front panel of the N1PEX1

Figure 2 shows the appearance of the N2PEX1.

Figure 2 Front panel of the N2PEX1

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)
• Connection status indicator (LINK) - one color (green)
• Data receiving and transmission indicator (ACT) - one color (orange)

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

Interfaces

The front panel of the PEX1 has one optical interface. Table 1 describes the type and usage of the optical interface of the PEX1.

Table 1 Optical interface of the PEX1

Interface	Type of Interface	Usage
IN1	LC (pluggable)	Receives 10GE signals.
OUT1	LC (pluggable)	Transmits 10GE signals.

Jumpers and DIP Switches

The PEX1 does not have any jumpers or DIP switches that are used for board settings.

Valid Slots

The PEX1 must be installed in a valid slot in the subrack. Otherwise, the PEX1 fails to work normally.

The N1PEX1 occupies two slots, and it can be installed in slots 1-8, and 11-16. The PEX1 slot displayed on the NMS is the slot that has a smaller slot number between the two slots that house the PEX1. For example, if the PEX1 is installed in slots 1 and 2, the PEX1 slot displayed on the NMS is slot 1. The mapping relationships between the valid slots for the PEX1 and the allocated bandwidths are as follows:

• Slot 1: 5 Gbit/s
• Slot 3: 7.5 Gbit/s
• Slot 5, 7, 11, or 13: 10 Gbit/s
• Slot 15: 7.5 Gbit/s

Table 1 lists the slots valid for the PEX1 and the corresponding logical slots of the N1PEX1 on the NMS.

Table 1 Slots valid for the N1PEX1 and the corresponding logical slots of the N1PEX1 on the NMS

Slot Valid for the PEX1	Corresponding Logical Slot
Slots 1 and 2	Slot 1
Slots 3 and 4	Slot 3
Slots 5 and 6	Slot 5
Slots 7 and 8	Slot 7
Slots 11 and 12	Slot 11
Slots 13 and 14	Slot 13
Slots 15 and 16	Slot 15

The N2PEX1 occupies one slot, and it can be installed in slots 1-8, and 11-16. The mapping relationships between the valid slots for the N2PEX1 and the allocated bandwidths are as follows:

• Slots 1-3, and 16: 2.5 Gbit/s
• Slots 4-6, and 13-15: 5 Gbit/s
• Slots 7 and 12: 10 Gbit/s
• Slots 8 and 11: 20 Gbit/s

 NOTE:

• Two-slot boards can work only with cross-connect boards whose logical boards are N1PSXCS.
• One-slot boards cannot work with cross-connect boards whose logical boards are N1PSXCS.
• Two-slot boards and one-slot boards cannot be configured at the same time.

Technical Specifications of the PEX1

The technical specifications of the PEX1 include the parameters specified for optical interfaces, laser safety class, mechanical specifications, and power consumption.

Parameters Specified for Interfaces

Table 1 lists the parameters specified for the optical interfaces of the N1PEX1.

Table 1 Specifications of the ports of the N1PEX1

Port type	Description
10GBASE-LR(LAN)/10GBASE-LW(WAN)	10 km 10GE two-fiber bidirectional optical interfaces(XFP)
10GBASE-ER(LAN)/10GBASE-EW(WAN)	40 km 10GE two-fiber bidirectional optical interfaces
10GBASE-ZR(LAN)/10GBASE-ZW(WAN)	80 km 10GE two-fiber bidirectional optical interfaces

Table 2 lists the parameters specified for the optical interfaces of the N2PEX1.

Table 2 Specifications of the ports of the N2PEX1

Port type	Description
10GBASE-LR(LAN)	10km 10GE two-fiber bidirectional optical interfaces(XFP)
10GBASE-ER(LAN)	40km 10GE two-fiber bidirectional optical interfaces
10GBASE-ZR(LAN)	80km 10GE two-fiber bidirectional optical interfaces
70 km CWDM	70km 10GE CWDM optical interfaces
40 km DWDM	40km 10GE DWDM optical interfaces
80 km DWDM	80km 10GE DWDM optical interfaces

Laser Safety Class

The safety class of the laser on the board is Class 1. The maximum launched optical power of the optical interfaces is less than 10 dBm (10 mW).

Mechanical Specifications

The mechanical specifications of the N1PEX1 are as follows:

• Dimensions (mm): 50.3 (W) x 235.2 (D) x 261.4 (H)
• Weight (kg): 2.4

The mechanical specifications of the N2PEX1 are as follows:

• Dimensions (mm): 25.4 (W) x 235.2 (D) x 261.4 (H)
• Weight (kg): 1.4

Power Consumption

The maximum power consumption of the N1PEX1 at room temperature (25°C) is 107 W.

The maximum power consumption of the N2PEX1 at room temperature (25°C) is 48 W.

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