Does Huawei GPON ONT HS8145V Support WLAN 802.11ac?

Huawei GPON ONT HS8145V is Huawei high-end GPON ONT, support 802.11ac dual band 2.4G/5G WIFI, with 4*GE+1*POTS+1*USB interface, Huawei Logo, English version. 

Also it supports IPv4 and IPv6.

What are the security features of Huawei S5720-36C-PWR-EI-AC?

What are the security features of Huawei S5720-36C-PWR-EI-AC?

• Hierarchical user management and password protection
• DoS attack defense, ARP attack defense, and ICMP attack defense
• Binding of the IP address, MAC address, interface number, and VLAN ID of a user
• Port isolation, port security, and sticky MAC
• MAC Forced Forwarding (MFF)
• Blackhole MAC address entries
• Limit on the number of learned MAC addresses
• IEEE 802.1x authentication and the limit on the number of users on an interface
• AAA authentication, RADIUS authentication, HWTACACS+ authentication, and NAC SSH v2.0
• Hypertext Transfer Protocol Secure (HTTPS)
• CPU defense; Blacklist and whitelist; MACSec ready

What is the Working Principle and Signal Flow of Huawei STM-4 service board SLD4A?

SLD4A consists of the O/E converting module, CDR module, SDH overhead processing module, logic and control module, and power module. 

SLD4A can apply to Huawei MSTP equipment OSN1500B, OSN2500, OSN3500 and OSN7500.

Figure 1 shows the functional block diagram of the SLD4A.

Figure 1 Functional block diagram of the SLD4A

The functional modules of the STM-4 units are described as follows:

O/E Converting Module

• Converts the received optical signals into electrical signals, in the receive direction.
• Converts the electrical signals into SDH optical signals, and then sends the SDH optical signals to fibers for transmission, in the transmit direction.
• The SPI detects the R_LOS alarm and provides the laser shut down function.

CDR Module

This module restores the clock signal.

SDH Overhead Processing Module

this 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 regenerator section overhead (RSOH). That is, the RST sub-module detects the frame alignment bytes (A1 and A2), descrambles all the bytes except the first line of the RSOH, restores and checks the regenerator section trace byte (J0), 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 line of the RSOH.
• MST sub-module
  • In the receive direction, the MST sub-module terminates the multiplex section overhead (MSOH). That is, the MST sub-module generates the multiplex section-alarm indication signal (MS_AIS) alarm and detects the multiplex section-remote defect indication (MS_RDI) alarm after detecting the K2 byte, and detects the multiplex section-remote error indication (MS_REI) alarm and generates the B2-excessive errors (B2_EXC) alarm after checking the B2 byte.
  • 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 the administration unit group (AUG), divides an AUG into N AU-4s, detects the administration unit-loss of pointer (AU_LOP) alarm and the administration unit-alarm indication signal (AU_AIS) alarm, and performs pointer justifications.
  • In the transmit direction, the MSA sub-module assembles the AUG and generates the 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 path overhead (POH). That is, the HPT sub-module detects the higher order path-remote error indication (HP_REI) alarm after checking the B3 byte, generates the higher order path-trace identifier mismatch (HP_TIM) alarm and the higher order path-signal label mismatch (HP_SLM) alarm and detects the higher order path-remote defect indication (HP_RDI) alarm after detecting the J1 and C2 bytes, and generates the higher order path-unequipped (HP_UNEQ) alarm after detecting the C2 byte.
  • 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.

Logic and Control Module

• Manages and configures the other modules of the board.
• Performs inter-board communication through the internal Ethernet interface.
• Traces the clock signal from the active and standby cross-connect units.
• Controls the laser.
• Passes the orderwire and ECC bytes through an ADM that consists of two paired slots when the GSCC is not in position.
• Selects the clock signal and frame header signal from the active and standby cross-connect units.
• Controls the indicators on the board.

Power Module

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

What Is the Bandwidth Limitation on Huawei Switch Subcards?

The subcards in the front slot and rear slot use the same chip that provides 4x10 Gbit/s
bandwidth. Therefore, S5700-EI Switch or S5700-SI stacks set up through stack cards have the
following limitations:
A stack card can be used with a 2 x 10G subcard. The two stack interfaces on the stack card
occupy 20 Gbit/s bandwidth, and the 2 x 10G subcard occupies 20 Gbit/s. A stack subcard
cannot be used with a 4 x GE subcard. The GE interfaces on the 4 x GE subcard are actually
10GE interfaces with their rates limited, so the actual bandwidth of the subcard is 4x10
Gbit/s. This subcard occupies all the 4x10 Gbit/s bandwidth of the chip, and thus there is no
available bandwidth for the stack card.

What is the Hardware Configuration of Huawei DSLAM MA5616?

In Huawei MA5616 chassis, slot 0 houses the control board, slots 1-4 service boards, and slot 5 power board.

MA5616s support H831MABA and H831MABB backplanes. If an MA5616 is required to support vectoring, configure an H831MABB backplane for it..

Figure 1 shows the layout of the MA5616 chassis.

Figure 1 Layout of the MA5616 chassis, service boards can be ADSL2+ or VDSL2 board, like ADLE VDLE board.

Board configuration and slot restriction in the MA5616 chassis

Troubleshooting Case For CRC Issue Between Switch And DWDM

Problem Description:

A bank Customer report that there are CRC frame in Huawei Switch S7700 (connect to DWDM 1800), but the CRC do not increase all the time, Customer replaced trail fiber and Optical module, but the problem couldn’t be solved.

CRC error received in Switch (D side):

CRC ERROR transmitted in 1800 (D side):

Topology:

Troubleshooting process:

1.      The optical module and fiber trail in D site has been replaced but problem is not solved, so faulty should not be on site D (including Switch and 1800).

2.      Check DWDM performance, the error after FEC in the direction from M to D is 0, the DWDM channel quality is very good. Problem is not found till now.

3.      Discuss with R&D expert, DWDM can check CRC but it will transmits the CRC error frames instead of dropping them, so the CRC error frames may come from site M.

4.      All the CRC counter is set to 0, after one day time, the result will be clear that where are the CRC frames produced.

5.      After one day, 11 CRC frames received in Switch(D site)

Check DWDM side:

D side transmitted 10949 bytes bad packets to Switch:

In M side, DWDM received 10949 bad bytes from Switch:

So the counter as bellow picture. It is easy to confirm the problem between DWDM and Switch in M site produce the CRC frame.

Solution:

Replace the optical module and fiber between DWDM and Switch in M site.

What do we learn from the case?

In Huawei OTN equipment, bit transparently transmitted mode can check CRC too, but even if CRC frame is found, OTN will continue to transmit instead of drop it. So in this mode, we can use the CRC counter function to help to do troubleshooting where produce CRC frames.

GPON, XG-PON, XGS-PON, What is the difference?

Specification Differences Between 10G GPON and GPON

The following table lists specification differences between the two technologies.

Huawei MA5683T 5680T and MA5800 series OLT all support GPON and XGPON. Huawei GPON boards and XGPON boards are in bulk supplied in Thunder-link.com. If you have needs, you can contact Daisy@thunder-link.com for more details.