In this section:

Overview

The DSC is designed to support SIGTRAN [name derived from the former Internet Engineering Task Force (IETF)] and SS7 time division multiplexed (TDM) links.

Note

 The SS7 TDM links are not supported on the DSC SWe. For more information, refer to the Limitations for the DSC Platforms.


Supported SIGTRAN Links

For information about configuring SIGTRAN or SS7 TDM Links, refer to the appropriate pages in SS7 Application Guide 1.

The following table lists and describes the SIGTRAN signaling link types supported on the DSC.

For detailed information about these links, refer to Configuring Links.

Supported SIGTRAN Link Types

Common Name         DestinationNotes                         Industry Standard
M2PA LinkSTP or Network Element

Message Transfer Part 2 (MTP2) User Peer-to-Peer Adaptation Layer (M2PA) is a SIGTRAN protocol that supports the transport of SS7 MTP2 user part signaling messages over IP using Stream Control Transmission Protocol (SCTP). Therefore, an M2PA link is used for communication between SS7 systems over IP rather than T1 or E1 TDM links.

M2PA links are based on RFC4165. M2PA links require that both ends in the link have a unique PC. This link type is commonly used for STP to STP links.

Yes
M3UA LinkIP application like Home Location Register (HLR)

The MTP Level 3 (MTP3) User Adaptation Layer (M3UA) links are used in networking scenarios where an Application Server Process (ASP) connects to a DSC, where this platform is configured as an SG.

This connection method is extensively used in many networks [for example, Home Location Registers (HLRs)]. An M3UA ASP must register to the SG with a PC. Some additional parameters may be also required for this registration. The PC can be the SG Local Point Code (LPC) or Virtual Point Code (VPC).

M3UA links are based on RFC4666.

For more information about the LPC, refer to Local Point Code. For information about VPC, refer to Virtual Point Code.

Yes
SUA LinkIP application

The SCCP User Adaptation Layer (SUA) links are similar to the M3UA links but are utilized at the SCCP layer. The SUA application registers with a PC and a Subsystem Number (SSN).

SUA links are based on RFC3868.

Yes
M2UA LinkRemote I/O card

M2UA allows for a remote I/O card to be connected to the STP.

M2UA links are based on RFC3331.

Yes
Generic Links 

A Generic Link may be an Internet Protocol Signaling Points (IPSP) link, an M3UA Media Gateway (MG) link, an M3UA Server, or an M3UA SG link.

IPSP and MG links are customer-proprietary. M3UA Server links provide a subset of M3UA SGP functionality (RFC 4666). The M3UA SG links provide a subset M3UA ASP functionality (RFC 46666). 

All Generic Links utilize SCTP associations for transport.

For more information about Generic Links, refer to Configuring Generic Links.

No

The following table lists and describes the SS7 TDM link types supported on the DSC 8000.

For detailed information about these links, refer to Configuring Links.

Note

The supported J1 interface is the TTC 1.5 Mbps interface, not the NTT 2.0 Mbps interface.

Supported SS7 TDM Link Types

Common NameNotesCapacity                       
Low-speed LinkLow-speed Channelized (LS) time division multiplex (LS or TDM) links. Time division multiplexing is a mechanism for dividing the bandwidth of a T1 or E1 into separate channels or time slots to be used as links.


An E1 TDM provides a 2.048Mbps communications link divided into 32 time slots of 64Kbps each. A T1 TDM provides a 1.544 Mbps communication link divided into 24 time slots of 64 Kbps.

56 Kbps, 64 Kbps, and 48 Kbps

ATM QSAAL (High-speed Link)

Asynchronous Transfer Mode (ATM) links are in compliance with Q.2931. This protocol over the signaling ATM adaptation layer (QSAAL) supports connection control signaling. The messages are sent over this layer, which ensures their reliable delivery. The message types for Q.2931 are point-to-multipoint messages and include ALERTING, PROGRESS, SETUP ACKNOWLEDGE, INFORMATION, and NOTIFY.

Dependent upon MSU size, link quality, and other items.

Typically eight to 15 times the capacity of an LS link.

Unchannelized Annex A (High-speed Link)

Annex A (high-speed unchannelized) links are similar to a channelized TDM link, but the Annex A links utilize the full bandwidth available on E1 or T1 according to Q.703/Annex A.

This link type provides data rates of 1.5 and 2.0 Mbps as a national option, which means that an entire T1 or E1 is used as a single Annex A link.

1.5 Mbps (ANSI), 2.048 Mbps (ITU/ETSI)

The DSC supports Access-links (A-links), Bridge-links (B-links), Cross-links (C-links), Diagonal links (D-links), Extended links (E-links), and Fully Associated-links (F-links).

 

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