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18-2 Preliminary May 9, 2000 APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide
Signaling System 7 (SS7)
System requirements for SS7 operations
System requirements for SS7 operations
A TAOS unit configured for SS7 in communication with an SS7 signaling gateway is a service
switching point (SSP). To operate in this capacity, the TAOS unit must have the following
equipment and licenses:
• SS7 software license, either for ASGCP or IPDC
• Sufficient T1, T3, or E1 trunks
• Sufficient modem or Hybrid Access (HDLC) cards (or both) to terminate data calls
• One or more Ethernet cards (recommended to offload the shelf controller)
If the system is a MAX TNT unit and will operate as a MultiVoice gateway in an SS7
environment, a MultiVoice software license must also be enabled and one or more MultiDSP
cards must be installed to enable the system to terminate voice calls. For details about
MultiVoice, see the MultiVoice for MAX TNT Configuration Guide.
TAOS unit as terminator of data calls in an SS7 network
With the ASGCP license, TAOS units can decrease congestion on the Public Switched
Telephone Network (PSTN) caused by users connecting to the Internet. An example of a
TAOS unit being used for this purpose is shown in Figure 18-1.
Figure 18-1. TAOS terminating data calls in an SS7 network
The TAOS unit is connected to the entry (ingress) central office (CO) switch via intermachine
trunks (IMTs) and to a signaling gateway by means of dual-link (primary and secondary)
TCP/IP links. Each CO switch is a service switching point (SSP). The combination of a TAOS
unit and signaling gateway is also an SSP. The signaling gateway is connected to the SS7
network by access links (A-links). The signaling gateway and the TAOS unit together act as a
switch that routes calls intended for ISPs directly to the TAOS unit, thus avoiding the PSTN
tandem or transit switches and interoffice trunks.
PSTN
Ingress CO
switch
Egress CO
switch
SS7 Network
IMT data
trunk
ISP B
ISP C
signaling gateway
A-links
Tandem CO
switch
Data path without ASGCP
Data path with ASGCP
Frame Relay,
ATM, or IP
PRI
TCP/IP
ASGCP
ISP A
TAOS