Riverstone Networks Network Device SSG - Manual (Page 4)

The Alcatel 5070 SSG ANSI serves as a transport
system to provide reliable transfer of Message
Signal Units (MSUs) between network locations
and across network fabric transitions. With the
flexibility of this product, carriers can address
expanded capacity and connectivity needs,
continue to offer a wide variety of applications
in the SS7 network, and bridge directly to packet
networks.
High Capacity
To support basic functions such as Message
Transfer Part (MTP), Signaling Connection
Control Part (SCCP), and the signaling gateway
function, the Alcatel 5070 SSG ANSI offers
the following features and services.
IP Signaling Links
IP signaling links, or IPVHSLs, allow the Alcatel
5070 SSG ANSI to act as the signaling gateway
between SS7-based and IP-based packet networks.
High capacity IPVHSLs support growing call
handling volume between the SS7-based
networks and IP-based networks where the
message capacity exceeds that of SS7 link sets.
The Alcatel 5070 SSG ANSI provides an IP
signaling link that replaces many SS7 links.
Gateway Screening is available on the SS7 side
of the interface to protect the IP network from
unauthorized access by SS7 network elements.
IPVHSLs also provide an alternative form of
high-speed link connectivity within SS7 networks
to support high capacity B, C and D links between
STP nodes, as well as A links to service control
points and HLRs.
The Alcatel 5070 SSG ANSI includes SS7-IP
protocols as defined by the Internet Engineering
Task Force (IETF) SIGTRAN working group.
The base protocol layer is SCTP, with multiple
adaptation layers such as M2PA, M3UA, SUA and
M2UA, depending on the network application.
The initial adaptation layer implemented is M2PA.
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