An SS7 linkset is defined as the set of all SS7 signaling links connecting a given node to the same adjacent node on the circuit-switched SS7 network. There can be only one SS7 linkset between two adjacent signaling points.
The DSC - SP2000 Platforms supports the following link types:
LS (low-speed channelized) time division multiplex (LS or TDM) links
Time division multiplex 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 1.544Mbps communication link divided into 24 time slots of 64K bps.NoteThese links are commonly known as SS7 Links, although the other listed link types also carry SS7 traffic.
- Annex A (high-speed unchannelized) links
An unchannelized link or Annex A link is similar to a channelized LS channelized TDM link, but the Annex A link utilizes the full bandwidth available on the E1 or T1 according to Q.703/ Annex A. This link provides data rates of 1.5 and 2.0Mbit/s as a national option, which means that an entire T1 or E1 is used as a single Annex A link. - Asynchronous Transfer Mode (ATM) links
Q.2931 protocol over 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. - M2PA links
M2PA is a SIGTRAN protocol that supports the transport of SS7 MTP2 user part signaling messages over IP using 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 RFC4615. - M2UA links
The MTP3 to MTP2 interface is described in ITU Q.701 and ANSI T1.111.1 in terms of abstract primitives. M2UA is an IETF protocol (RFC3331) that provides a realization of the MTP3 to MTP2 interface in terms of messages exchange over SCTP and associated procedures. This allows M2UA-capable MTP3 and MTP2 from different vendors, or in different geographic locations, to inter-operate.
Several links may be configured on the (remote) MTP2, and several links may be managed using the same M2UA/SCTP association. In the Web UI, the M2PA connection between MTP3 and MTP2 is modeled as an L2 Connection with Type set to HWM_SCTP and M2UAProtocol Type set to M3UA. The links that use an M2UA L2 Connection are M2UA Links. M2UA links can be any link type supported by the (remote) MTP2, so the underlying link type may be a Low-Speed SS7 Link, a High-Speed Link, an Annex A link, an M2PA Link, and so on. - Generic Links
A Generic Link may be an IPSP, MG, or M3UA SG link, which are customer-proprietary link types. These links are M2PA-like in their network function, but use an M3UA-like message format.
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