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.
| Item | Description |
|---|---|
| Functional versions |
The PEX1 is available in two functional versions, namely, N1 and N2.
|
| Differences |
|
| 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.
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.
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 2 shows the appearance 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.
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.
| 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.
| 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.
| 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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