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Introduction of 2-Port 10GE Switching and Processing Board-N3EAS2

Whats N3EAS2?

The EAS2 is used to transmit/receive Ethernet services, manage bandwidths, and realize Layer 2 switching of Ethernet services, applied to Huawei OSN3500 and OSN7500. EAS2 boards support the transmission of 10 GE Ethernet services, LCAS, and test frame functions.

Front Panel Ports

The front panel of the EAS2 provides two 10GE ports. One port is IN1-IN2 to receive 10GE signals; the other is OUT1-OUT2 to transmit 10GE signals. Both ports are the LC connector type.


Front panel of the EAS2 

Working Principle and Signal Flow

The EAS2 consists of the interface processing module, mapping module, interface converting module, logic and control module, clock module, and power module.

  • In the Transmit Direction

The encapsulation or conversion module demaps and decapsulates the signals received from the cross-connect unit. Then, the interface converting module performs the interface converting operations and transmits the signals to the service processing module. The service processing module implements the functions of the Layer 2 switching and private line service. After the interface processing module converts parallel signals to serial signals and encodes the serial signals, the Ethernet interface module transmits the serial signals.

  • In the Receive Direction

The optical module performs O/E conversion on the 10 GE Ethernet signals, and then transmits the signals to the Ethernet interface module. The Ethernet interface module transmits the parallel signals to the service processing module to realize the functions of the Layer 2 switching and private line service. The encapsulation module encapsulates and maps the Ethernet GFP-F frames, and then transmits the signals to the cross-connect unit.

  •  Logic and Control Module

The logic and control module provides the communication, control, and service configuration functions of the board.

  • Clock Module

The clock module traces the system reference clock, and generates the required clock signals when the board is working.

  • Power Module

It converts the –48 V/–60 V power supply into the DC voltages that the modules of the board require.

Functional block diagram of the EAS2


PN: 03053445

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N3EAS2 Detailed Specification

Basic functions Receives/Transmits 2×10 GE Ethernet services.
Front panel port IN1-IN2: receives 10GE signals.
OUT1-OUT2: transmits 10GE signals.
Port type Supports 10GBASE-LR and 10GBASE-LW Ethernet optical ports, which comply with IEEE 802.3ae.
Functions when being used with

an interface board

Provides ports on the front panel.
Service specifications Formats of Ethernet data frames IEEE 802.3 Supported
Ethernet II Supported
IEEE 802.1 q/p Supported
Frame length range Supports the setting of the frame length to a value

ranging from 1518 bytes to 9600 bytes.

Supports a jumbo frame with a maximum length of 9600 bytes.
Concatenation granularities The following adjacent concatenation granularities are supported on N3EAS2 boards:

VC-4-Xv (X≤64) and VC-4-4c/16c/64c.

For N3EAS2 boards, VCTRUNK1 and VCTRUNK18 support VC-4-16c/64c adjacent concatenation.
Other VCTRUNKs only support VC-4-4c adjacent concatenation.
N3EAS2 boards support adjacent concatenation only for bidirectional services.
Encapsulation formats HDLC Not supported
LAPS Not supported
GFP-F Supported
MPLS technology Tunnel-based EVPL (transit) supported on N3EAS2 boards
VLAN technology Supports a total number of 4094 VLANs, which comply with IEEE 802.1q/p.
Maximum uplink bandwidth An N3EAS2 board supports a maximum of 20 Gbit/s upstream bandwidth and

can adapt to the bandwidth of its slot.

Maximum bound bandwidth N3EAS2: 128xVC-4
Maximum Power consumption 83 W
Temperature 25°C
Dimensions (mm) 25.4 (W) x 235.2 (D) x 261.4 (H)
Weight (kg) 01-Jan-00

Difference between N1 and N3 functional version

The EAS2 is available in the following functional versions: N1 and N3. Differences are as below:

Functional Version N1 N3
ERPS function Not supported Supported
One-fiber bidirectional optical modules Not supported Supported
Pluggable optical module XFP optical module SFP+ optical module
Ethernet virtual private line (EVPL) service Supports a maximum of 2048 link Supports a maximum of 4096
Maximum uplink bandwidth Supports a maximum of 10 Gbit/s Supports a maximum of 20 Gbit/s
Bound bandwidth 64xVC-4 or 192xVC-3 128xVC-4
MPLS technology Not supported Supported
MSTP Not supported Supported
ERPS Not supported Supported

From above information, we shall know the N3EAS2 basic functions and can better undertstand the differences between N1EAS2 and N3EAS2.

If any questions about N3EAS2, please contact our Thunder-link team

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