Building Fault-tolerant SS7 Systems Using the Intel® NetStructure™ SIU520 SS7 Signaling Gateway Application Note

A) Load sharing between link set 0 and link set 1 under normal

Link Set id 0

STPA

 

 

id

0,

slc

0

 

 

Link

 

 

 

 

Point Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SIU520

 

 

 

 

0x200

SSP/SCP

 

 

 

 

 

 

 

Link

 

 

 

 

 

 

 

 

 

 

 

 

id

 

 

 

 

 

Point Code

1,

slc

0

 

 

 

 

 

 

Point Code

 

 

STPB

 

0x100

 

 

 

 

 

 

 

 

0x400

 

 

 

 

 

 

 

Link Set id 1

 

 

 

 

 

 

 

 

Point Code

 

 

 

 

 

 

 

 

 

 

0x300

 

B)Traffic sent over link set 1 under failure of STP

Link Set id 0

 

 

id

0,

slc

0

 

 

 

 

Link

 

 

 

 

 

 

 

 

 

 

 

 

SIU520

 

 

 

 

 

 

 

SSP/SCP

 

Link

id

1,

slc

0

 

 

 

Point Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Point Code

 

 

 

 

 

 

 

0x100

 

 

 

 

 

STPB

 

 

 

 

 

 

 

0x400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Link Set id 1

 

 

 

 

Point Code

 

 

 

 

 

 

 

0x300

 

Figure 4. SIU520 Connected to Mated STP Pair Providing Route Resiliency

Failure of Routes

Problem — With a single route to a destination point code (DPC), service can be disrupted if all the links of the link set used to reach that signaling node fail. Route failover is a standard MTP3 operation which does not require any specific action from the user application.

Solution — To eliminate this single point of failure, an alternative link set can be provided in the SIU520 system configuration to reach the same DPC. Route failover is a standard MTP3 operation which does not require any specific action from the user application.

Note: When an alternative route to a given DPC is

defined in an SIU520 configuration file, a choice must be made between two different traffic modes: load sharing or failover. In load-sharing mode, traffic sent towards the remote signaling point is shared between the two link sets. In failover mode, all traffic sent towards the remote signaling point will normally be sent using the primary link set, unless this link set fails, in which case the traffic will use the alternative link set. See the Intel NetStructure SIU520 Developer’s Manual for more information on the selection of traffic mode in the MTP_ROUTE command.

Details — This example (see Figure 4) shows two link sets (each containing one link) being used in load-sharing mode to reach destination point code 0x400.

*MTP_LINKSET <linkset_id> <adjacent_spc> <num_links> <flags> <local_spc> <ssf> MTP_LINKSET 0 0x200 2 0x0000 0x100 0x08

MTP_LINKSET 1 0x300 2 0x0000 0x100 0x08

*MTP_LINK <link_id> <linkset_id> <link_ref> <slc> <bpos> <blink> <bpos2> *<stream> <timeslot> <flags>

MTP_LINK 0 0 0 0 0 0 0 0 16 0x0006 MTP_LINK 1 0 1 1 0 1 0 1 16 0x0006 MTP_LINK 2 1 0 0 0 2 0 2 16 0x0006

MTP_LINK 3 1 1 1 0 3 0 3 16 0x0006

*MTP_ROUTE <dpc> <linkset_id> <user_part_mask> <flags> <second_ls> <pc_mask> MTP_ROUTE 0x400 0 0x0020 0x0003 1 0x00000000

5

Page 8
Image 8
Intel SIU520 SS7 manual Failure of Routes, Link

SIU520 SS7 specifications

The Intel SIU520 SS7 is a significant advancement in the realm of telecommunications, specifically designed for seamless signaling in a wide array of telecommunication infrastructures. As a part of Intel's pioneering suite of products, the SIU520 plays a critical role in managing signaling for telephony systems that require efficient handling of SS7 protocols.

One of the main features of the SIU520 is its support for the SS7 signaling protocol, which is pivotal for the establishment and management of telephone calls over traditional circuit-switched networks. With its robust design, the SIU520 ensures reliability in signaling, contributing to the reduction of call set-up times and the minimization of errors, thus enhancing the overall quality of communication services.

The SIU520 incorporates advanced technologies such as high-speed data processing capabilities, allowing it to handle multiple signaling messages concurrently. This is particularly important in environments with high call volumes, where efficient processing can significantly affect the performance of telecommunication services. Furthermore, the architecture of the SIU520 is designed for scalability, enabling easy integration into existing infrastructures while accommodating future expansions as demand increases.

Another characteristic that sets the SIU520 apart is its support for various signaling types beyond standard SS7, including ISDN and SIP. This makes it a versatile tool for service providers aiming to offer diverse services, such as voice, video, and data communications. The SIU520 is also designed with a focus on interoperability, which ensures that it can effectively communicate with equipment from different manufacturers, thus providing flexibility in deployment.

In terms of security features, the SIU520 is architected to withstand common threats in the communication landscape. It employs encryption and authentication protocols to safeguard signaling traffic, ensuring that sensitive information remains protected during transmission.

In summary, the Intel SIU520 SS7 represents a robust and flexible signaling solution crucial for modern telecommunications. With its support for multiple protocols, high processing speeds, scalability, and secure communication capabilities, it stands as a testament to Intel's commitment to advancing telecommunication technologies and enhancing the efficiency and reliability of communication networks worldwide.