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 PEX2 is available in one functional version, namely, N1.
Version Mapping
| Board | Start Version |
|---|---|
| N1PEX2 | 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 | New add the function "ETH-TRUNK". |
| Add | New add the function "LLDP (Link Layer Discovery Protocol)". |
Application
The PEX2 is mainly used in the packet data transmission field to transmit/receive data packets, manage bandwidths, and implement switching of data packets.
Figure 1 shows the typical networking and application of the PEX2. The PEX2 works with the cross-connect board that provides the packet switching function to meet the requirement of packet features. With this board, the TDM domain can be overlapped with the packet domain on the OptiX OSN equipment so that the data can be transmitted in the two domains. In this manner, an MSTP network can smoothly evolve to a packet switching network.
Functions and Features
PEX2 boards process and forward 2x10 Gbit/s Ethernet services and support QoS functions such as traffic management, congestion control, and queue scheduling of data packets.
Table 1 lists the functions and features supported by PEX2 boards.
Working Principle and Signal Flow
The PEX2 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 PEX2.
Receive Direction
The network processing module receives 2x10GE 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 schedules 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 PEX2 can process the 20 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 for the flow queue and port queue, and the bandwidth restricting function, and provides the corresponding statistics information.
- Large volume buffering: The transmission management module supports traffic of 20 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 board. 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 PEX2. It performs the following functions:
- Decodes the address signals of the peripheral modules, allocates the registers, and controls the logic.
- Reports and controls the board status, for example, the shutdown or startup of the laser.
- Controls the logic of the CPU module and decodes the address signals of the CPU module.
- Configures services, queries the performance, and controls alarms.
- Implements some clock functions.
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 clock signals for each module of the PEX2.
- 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 PEX2 require.
Front Panel
The front panel of the PEX2 has indicators, interfaces, 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 PEX2.
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 PEX2 has two optical interfaces. Table 1 describes the type and usage of the optical interfaces of the PEX2.
Jumpers and DIP Switches
The PEX2 does not have any jumpers or DIP switches that are used for board settings.
Valid Slots
The PEX2 must be installed in a valid slot in the subrack. Otherwise, the PEX2 fails to work normally.
The following part lists the valid slots of the PEX2 and the corresponding bandwidths:
- 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:
One-slot boards cannot work with cross-connect boards whose logical boards are N1PSXCS.
Technical Specifications of the PEX2
The technical specifications of the PEX2 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 PEX2.
| Port type | Description |
|---|---|
| 10GBASE-LR (LAN) | 10 km 10GE two-fiber bidirectional optical interfaces(XFP) |
| 10GBASE-ER (LAN) | 40 km 10GE two-fiber bidirectional optical interfaces |
| 10GBASE-ZR (LAN) | 80 km 10GE two-fiber bidirectional optical interfaces |
| 70 km CWDM | 70 km 10GE CWDM optical interfaces |
| 40 km DWDM | 40 km 10GE DWDM optical interfaces |
| 80 km DWDM | 80 km 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 PEX2 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 PEX2 at room temperature (25°C) is 49 W.
As a world leading Huawei networking products supplier, Hong Telecom Equipment Service LTD(HongTelecom) keeps regular stock of Huawei router and switch and all cards at very good price, also HongTelecom ship to worldwide with very fast delivery.
For related articles, visit the HongTelecom Blog and HongTelecom Blogger.
For real pictures of related product, visit the HongTelecom Gallery.
To buy related product, visit the HongTelecom Online Shop.
Comments
Post a Comment