Services can be configured for an ONT(such as HG8245HHG8245H) only after the ONT is successfully added to an OLT.
- The PC gains access to the Internet in PPPoE dialup mode.
- The ONT is connected to the GPBC card of the OLT through an optical fiber.
- The broadband remote access server (BRAS) provides broadband user access and functions of authentication and accounting.
Figure 1 Configuring the GPON FTTH Internet service
Table 1 Data plan
DBA Type: Assured Bandwidth/Maximum Bandwidth
Assured bandwidth: 8 Mbit/s
Maximum bandwidth: 20 Mbit/s
|ONT line profile
||Profile name: ftth
T-CONT ID: 4
GEM port ID for Internet access services: 14
|ONT service profile
||Profile name: ftth
ONT port capability set:
- Number of POTS Ports: Adaptive
- Number of ETH Ports: Adaptive
- Number of CATV Ports: Adaptive
|Network topology data
||Upstream port: 0/19/0
PON port: 0/1/0
ONT ID: 1
ID of the port on the ONT that is connected to the PC: 1
- S-VLAN ID: 100
- S-VLAN type: smart
- S-VLAN attribute: stacking
- C-VLAN ID: 1001
- C’VLAN ID: 1010
VLAN translation policy:
- ONT: ONTs configure the VLAN and add the same C-VLAN tag to packets. All ONTs are in the same C-VLAN.
- OLT: The OLT performs VLAN translation: C<->S+C’. The C’-VLAN of every ONT differs from each other.
- Implement pre-configurations.
After all profiles are configured, perform the following steps to issue them to the device:
- In the information list, right-click the record and choose
from the shortcut menu.
- In the dialog box that is displayed, select the required NE(s), and click OK.
- Configure a DBA profile.
- Configure a line profile.In a line profile, a GEM port can be bound to up to eight service streams. In a GEM port, different GEM connections need to be set up for different service streams.
In this example, the mapping between GEM ports and ONT-side services is implemented through VLANs, and the service streams of each service are mapped to GEM port 14. In addition, different GEM connections are set up for the management VLAN and the VLANs for the Internet, voice, and multicast services.
- Configure a service profile.Set the port capability set to adaptive. Then, the system adapts the port capability set of an online ONT to its actual capability. Then, in the ONT service profile, configure a VLAN translation policy to translate C-VLAN 1001 to VLAN 100.
- Configure an MEF IP traffic profile.The profile name is ftth_hsi, CIR is 4 Mbit/s, and the priority is 0. Traffic is scheduled based on the priority specified in the profile.
- Configure a service VLAN on the OLT side.The prerequisite for performing operations in the navigation tree is to navigate to the NE Explorer of the OLT. To navigate to the NE Explorer of the OLT, do as follows: In the Main Topology, double-click the required OLT in the navigation tree; or right-click the required OLT and choose from the shortcut menu.
A service VLAN is the VLAN used for the Internet service.
- Provision services.The prerequisite for performing operations in the navigation tree is to navigate to the NE Explorer of the OLT. To navigate to the NE Explorer of the OLT, do as follows: In the Main Topology, double-click the required OLT in the navigation tree; or right-click the required OLT and choose from the shortcut menu.
- Add an ONT.The ONT connects to the GPON port 0/1/0 is ONT 1. The serial number of the ONT is 32303131D659FD40, password is 0100000001, discovery mode for password authentication is Always On, management mode is OMCI, bound ONT line profile name is ftth, and the ONT service profile name is ftth.
HG8245H is used as an example. For other ONTs, set Terminal Type based on practical conditions.
The ONT software version is the same (V3R017C00) for the SIP protocol and H.248 protocol.
- Configure an ETH port of the GPON ONU.
- Add a service virtual port on the OLT side.
Check whether the user successfully gains access to the Internet through dialup on the PC.
- The LAN1 port of the ONT is connected to the Ethernet port of the PC properly.
- Dial up on the PC using the PPPoE dialup software.
- The user gains access to the Internet on the PC after the dialup is successful.
The WXCP protection cannot be implemented due to wrong configuration of the LQG boards.
In the case of the OptiX Metro 6100 V100R007C01B02a, the user tries to configure the WXCP protection for a new service by using the LQG boards. During the configuration, however, the T2000 reports errors and thus the configuration of the WXCP protection fails.
The configuration mismatch could be the most probable reason for not working.
- Log in to the T2000 server remotely to check whether the LQG boards at the local and opposite station are configured properly.
- Double-click the ONE icon on the Main Topology. The NE Panel tab is displayed.
- Right-click the NE and then choose NE Explorer.
- In the NE Explorer, select the LQG board and then choose
from the Function Tree. The steps for checking the board configuration are as follows:
- Check the value of Automatic Laser Shutdown. It is found that the parameter is set to Disabled.
- Check the value of Laser Status for the optical interfaces on the WDM side and client side. It is found that the parameter is set to Open.
- Check other parameters and make sure that the settings of the LQG boards at the local site and opposite site are the same.
In the check process, it is found that LPT Enabled is set to Enabled for one LQG board but Disabled for the other board. That is why the configuration of the WXCP protection fails. After LPT Enabled for both LQG boards is set to Disabled, the WXCP protection is configured successfully.
The parameter settings of the LQG boards at both ends should be consistent so that the WXCP protection can be configured successfully.
When the Ethernet boards are interconnected, the test frame cannot function normally due to the inconsistent bearing modes.
When the N2EFS4 board is interconnected to the N1EFT8/R1EFT4/N1EFT8A board, the receive end fails to receive any test frame, and the transmit end fails to receive any response frame.
The N2EFS4 board transmits the test frames in Ethernet bearing mode, but the N1EFT8/R1EFT4/N1EFT8A board supports GFP bearing mode only.
- Before enabling the function of the test frame, check whether the bearing modes at the two interconnected ends are consistent.
- For the board whose bearing mode of the test frame can be set and queried, you just need to query on the T2000.
- For the board whose bearing mode of the test frame cannot be set or queried, you need to refer to “Availability” in “Test Frame” of Features Description to obtain its bearing mode.
- If the bearing modes of the boards at the two interconnected ends are inconsistent, change the bearing modes to be the same so that the test frame can function normally.
Before transmitting test frames, ensure that the VC trunk port on which the function of the test frame is enabled, and that the corresponding cross-connection is configured.
The bearing modes of the boards at the two interconnected ends must be consistent. The boards in equipment of different versions may support different bearing modes for the test frame. See “Availability” in “Test Frame” of Features Description.
When you delete the PQ1 boards on the T2000, you also need to delete the corresponding interface boards. Otherwise, deleting the tributary boards may fail.
On the OptiX OSN 2500, one PQ1 board is inserted in slot 13, which is protected by the other PQ1 board in slot 5. The PQ1 board in slot 13 needs to be deleted. Firstly, the TPS protection group between the PQ1 boards in slot 13 and slot 5 is deleted and then the PQ1 in slot 5 is deleted. When the PQ1 board in slot 13 is deleted, however, the T2000 returns a prompt indicating that the service source cannot be released and the error code is “39492”. The NE software is 5.27.01.16 and the board software of the PQ1 is 1.17.
You may fail to delete the PQ1 board on the T2000 in the following cases:
- The PQ1 board may belong to a TPS protection group.
- The PQ1 board is configured with services.
- The interface board corresponding to the PQ1 board is not deleted.
- Check whether the PQ1 board belongs to the TPS protection group. It is found that the TPS protection group is already deleted before the PQ1 board in slot 13 deleted.
- Check the services on the PQ1 board in slot 13. It is found that the PQ1 board is not configured with any services or paths.
- It is found that the PQ1 board in slot 5 does not have the corresponding interface board, and can be deleted. Then, Check the relevant information. It is found that the PQ1 board in slot 13 has two D12S interface boards in slot 17 and slot 18. Delete the two interface boards, and then the PQ1 board in slot 13 is successfully deleted.
Determine whether the type and connections of the dispersion compensation module (DCM) are proper according to the insertion loss between the TDC and the RDC optical interfaces on the OAU when the OTU_LOF, R_OOF, R_LOF, and BEFFEC_SD alarms are reported discontinuously on the WDM(such as OSN6800, OSN8800) side of LWF board.
Optical Transponder Unit
During the deployment commissioning of the OptiX BWS 1600G system of a certain site, if is found that the OTU_LOF, R_OOF, R_LOF, and BEFFEC_SD alarms are generated discontinuously on the WDM side of certain LWF boards with the AFEC function. In addition, the BER before correction is 1, and the services are unavailable. In the system, only four wavelengths are added. And no regeneration OTU board is configured in the pass-through OTM station, which means that the west and east mux/demux boards are connected directly by using fiber jumpers.
The causes may be as follows:
- Optical power
- Signal-to-noise ratio (SNR)
- Failure of the LWF board
- Dispersion compensation
- Check whether the optical power on the entire network is normal. The optical power of multiplexed wavelength signals and the received and launched optical power of the board are found normal.
- Use an optical spectrum analyzer (OSA) to measure the OSNR in each faulty channel. It is found that the OSNR is above 20 dB. This is normal for either the LWF boards with the AFEC function or common LWF boards.
- Replace the west and east LWF boards and set the FEC Working Mode to be the same. The fault persists.
- The preceding steps exclude the possibility that the fault is caused by the LWF boards, the optical power, or the OSNR. Thus, the dispersion compensation may be improper. After recalculation, it is confirmed that the dispersion compensation value in the design is proper.
- We suspect that the DCMs on the network are improperly connected or the types of the customer fiber on the network are inconsistent with the fiber types specified in the design document. After confirmation with the customer, it is found that the customer fiber types meet the design requirements.
- To further determine whether the dispersion is improper, adjust the dispersion compensation range of a single wavelength of the faulty board by increasing or decreasing the dispersion compensation at the receive end. To increase the dispersion compensation, configure a DCM module between the D40 and LWF board at the receive end of the single wavelength; to decrease the dispersion compensation, replace the DCM module on the line side at the receive end with another DCM module with smaller compensation value. During the test, it is found that the dispersion of the single wavelength is over-compensated.
- On the network, only a small number of wavelengths are added, and no regeneration OTU board is used. Hence, it is difficult to narrow down the range in which the dispersion compensation is improper.
- On the T2000, query the difference between the optical power at the TDC optical interface and the optical power at the RDC optical interface on the OAU board where the DCM module is configured. Focus on the sites where the actual optical power difference differs greatly from the typical insertion loss of the DCM module, especially the sites where the OAU board is used at the receive end in the east and west directions but the DCM modules in the two directions are different. During the deployment, it is probable that the DCM modules are connected improperly, which results in over-compensation in one direction but under-compensation in the other direction.
- During the check, it is found that the insertion loss between the TDC and RDC optical interfaces on the OAU board in slot 1 at a certain OLA station is 5.6 dB, and the insertion loss between the TDC and RDC optical interfaces on the OAU board in slot 12 is 6.4 dB. According to the design requirements, the OAU board in slot 1 should be configured with E-type DCM module, and the OAU board in slot 12 should be configured with the C-type DCM module. That is, the insertion loss in the case of the OAU board in slot 1 should be greater than the insertion loss in the case of the OAU board in slot 12. The symptom indicates that the DCM modules in the east and west directions of the OLA station are configured reversely. After a check on site, it is found that the connections of the DCM modules reverse the connections specified in the design document. After the DCM modules are connected properly, the system performance becomes normal again, and the BER before error correction of the LWF boards on the entire network is restored to 0.
The problem is solved after the operation is finished as the requests.
During the deployment of WDM equipment, the west and east DCM modules in the OLA station or the back-to-back OTM station are connected reversely due to design or artificial factors. In such cases, probably over-compensation of dispersion occurs in one direction, while under-compensation of dispersion occurs in the other direction. As a result, the system fails to function. Therefore, it is vital to check the types and connections of the DCMs at all stations during the deployment of long haul WDM projects. The types and connections of the DCMs will also affect the system expansion.
During the deployment or expansion of a WDM system, locate the fault by increasing or decreasing the dispersion compensation at the receive end if you suspect that the dispersion compensation is improper. This method enables you to determine whether the current system experiences over-compensation or under-compensation of dispersion. This facilitates you to solve the problem.
How many NEs at a site can interconnect with each other using automatic extended ECC?
Many NEs in a certain site interconnect with each other using automatic extended ECCs. As a result, many NEs that are connected to each other using automatic extended ECC are unreachable to the T2000.
When extended ECC communication is established based on Ethernet, the number of NEs that are interconnected with each other through automatically extended ECC must be below seven (inclusive). In the case of manually extended ECCs, the number of clients connected to a server must be below seven (inclusive). Each of the clients, however, can function as a server and connect to other clients. Hubs or routers can be cascaded. The number of cascaded hubs or routers is subject to the network scale. This basic principle is applicable to all products and related to the specific platform.
In the case of the OptiX Metro 6100 and OptiX BWS 1600G, ETHERNET1 and ETHERNET2 in the interface area of a subrack are cascaded for communication. The number of cascaded NEs should be equal to or less than eight.