How to Plan Orderwire Phone Interfaces on Huawei Optix OSN2500?

Capability of Supporting Orderwire Phone Interfaces

The capability of supporting orderwire phone interfaces is defined.
The Q1SEI board of the Huawei OptiX OSN 2500 provides one orderwire phone interface, two NNI
voice interfaces and two NNI signaling interfaces. The five interfaces are all of the RJ-45 type.

Planning Principles

The principles for planning the orderwire phone interfaces are defined.
Adhere to the following principles when planning orderwire phone interfaces:

• Make sure that the orderwire signaling is compatible in the entire network.
• Make sure the orderwire phone number of each node is of the same length. It is recommended that the orderwire phone number be set as four characters.
• Set the orderwire phone number in the format: subnet number (one character) + user number (three characters).
• Make sure that the conference phone numbers in the entire network are the same and the number should be larger than the orderwire phone number. It is recommended that the conference phone number be set to 9999.
• Make sure that all orderwire phone numbers in the entire network, except the conference phone number, are unique.
• Make sure that the dial-up scheme of the orderwire phone of each node is dual-tone multifrequency.
• Make sure the call waiting time of each node is the same. If less than 30 nodes are present in the network, set the call waiting time to 5s. If more than 30 nodes are present in the network, set the call waiting time to 9s.
• The orderwire phone number should increase as the node ID increases.
• Consider the possibility of howl in the orderwire loop. Release the loop to solve the problem of howl in the conference phone. The loop is automatically released, if an OptiX OSN 2500 system is networked with other OptiX OSN 2500 systems, or with Huawei OptiX OSN 7500, OptiX OSN 3500, OptiX OSN 3500T, OptiX OSN 2500REG and the OptiX OSN 1500. If the OptiX OSN 2500 is networked with other equipment, manually release the loop.
• If no optical path is available between two nodes, which, however, require orderwire communication, use the orderwire NNI connection for the orderwire communication. Use Voice 1 or Voice 2 as the voice interface, and Serial 3 or Serial 4 as the data interface for the orderwire NNI connection.

Planning Example

An example is given to show how to plan the orderwire phone interfaces.

Set the orderwire phone number as four characters, with the last two characters being the same

as the node ID. The conference phone number has four characters and is 9999.

Planning the TPS Protection for the STM-1 Electrical Interface Service Boards

Capabilities of Supporting the TPS Protection for the STM-1 Electrical Interface Service Boards

The N1SEP, the STM-1 service board for Huawei OptiX OSN 2500, supports two 1:1 TPS protection groups.

Planning Principles
When planing the TPS protection for the STM-1 electrical interface service boards, follow the
basic principles.
Adhere to the following principles when planning the TPS protection for the STM-1 electrical
interface service boards.
Determine whether to configure the TPS according to the importance of the services.
When the N1SEP1 board works with the interface board to provide optical interfaces, choose the N1SEP.
When configuring the TPS protection group for the STM-1 electrical interface service
board, choose the N1SEP as the processing board, N1EU08 or N1EU04 as the interface
board, and N1TSB8 or N1TSB4 as the switching and bridging board.
When the slot for the protection board is slot 6, the slot for the working board is slot 7.
When the slot for the protection board is slot 13, the slot for the working board is slot 12.

Planning Cases
A case is given to show how to plan the TPS protection for the STM-1 electrical interface service boards.
TPS configuration for Huawei STM-1 electrical interface service boards

Capabilities of Supporting Clocks on Huawei OSN2500

The clocks supported by the equipment and the clock protection are defined.

Basic Functions

Huawei OptiX OSN 2500 have the following functions:
Tracing of the external clock source, line clock source, tributary clock source and internal
clock source.
Non-SSM, standard SSM and extended SSM.
Clock working modes compliant with ITU-T G.781, such as locked, hold-over, and free
run.
Output of the line clock, tributary clock and external clock.
Tributary re-timing.
ASON clock tracing scheme.

Clock Protection

Huawei OptiX OSN 2500 can realize the clock protection switching in the following ways:
l Do not enable the SSM, and then perform the clock source selection and switching
according to the priority list. In this case, do not configure two clocks in two directions on
one NE into the priority list. Otherwise, the clocks form a loop.
l Enable the standard SSM mode, and then configure the priority list to ensure that the OptiX
OSN 2500 can automatically select the clock source with the highest priority to avoid the
locked loop.
l Enable the extended SSM mode. Use the fifth to eighth bits of the S1 byte to define the
quality of the clock source, and use the first to fourth bits of the S1 byte to define the clock
source ID. Thus, the clock loop can be avoided. The principles for setting the clock IDs are
as follows:
– All external BITSs should be assigned with clock IDs.
– In the case of nodes with external BITSs, the internal clocks of these nodes should be
assigned with clock IDs.
– In the case of nodes that access the chain or ring network to another ring network, the
clock sources of these nodes should be assigned with clock IDs.
– In the case of nodes that access the chain or ring network to another ring network, when
the clock tracing level includes the line clock source, the line clock sources accessed to

another ring network should be assigned with clock IDs.

Basic Principles and Planning NE IDs of Planning the DCN

When constructing the DCN, select proper communication protocols according to the actual
networking situation, and follow the planning principles.
The principles for planning the DCN are as follows:

• When Huawei OptiX OSN 2500 constructs a network with other Huawei equipment, the HWECC or IP over DCC protocol is recommended. Use the same communication protocol in the entire DCN network.
• When the OptiX OSN 2500 constructs a hybrid network with equipment from other vendors, use the IP over DCC or OSI over DCC protocol according to the protocol supported by the equipment from other vendors.
• The OptiX OSN 2500 constructs a hybrid network with equipment from other vendors. In this case, if the equipment from other vendors do not support the IP over DCC or OSI over DCC, use the DCC bytes or the Ethernet service channels to transparently transmit the management information.
• When a communication protocol is used to construct the DCN network, properly set the DCN network scale and divide the network according to the network situation. Thus, the effect of large network scale on the DCN network can be reduced.
• The DCN network should be of the ring type to ensure the reliability of the network communication. Thus, route protection can be provided when fiber cuts or NE abnormalities occur. If fibers of the equipment cannot form a ring, extra DCN channels should be constructed to form a ring, and thus the route protection function can be realized.

NE IDs are used to identify Huawei transmission equipment. Thus, the NE IDs should be

configured when the DCN network uses the HWECC, IP over DCC, and OSI over DCC

protocols.

The principles for planning the NE IDs are as follows:

• The ID of each NE should be unique.
• In the same DCN network, the ID of each NE should be unique.
• An NE ID is 24 bits in binary, which can be divided into the former eight bits and the latter 16 bits.

– The former eight bits indicate the extended ID (the default value is 9), also called the subnet number, which identifies different subnets. The subnet number cannot be 0 or 0xFF (255 in decimal).

– The latter 16 bits indicate the basic ID. The value of the basic ID cannot be 0 or 0xBFF0(49136 in decimal), or be greater than 0xBFF0.

In the ring network, the NE IDs should be increased one by one in the same direction along

the ring network.

A complex network should be divided into rings and chains. First set IDs for NEs on the

ring from 1 to N, and then set the IDs for NEs on the chain as N+1, N+2,…