Cisco AS5850 Руководство по установке оборудования - Страница 6
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Functional Overview
A dial wholesale customer can connect to a Cisco AS5850, then tunnel PPP (Point-to-Point Protocol)
packet information to a retail service provider using dial Virtual Private Network (dial VPN).
For detailed system specification tables, refer to
Traffic Flow
Figure 1-3
Figure 1-3
A typical user connection flows as follows:
1.
2.
3.
4.
5.
Cisco AS5850 Universal Gateway Hardware Installation Guide
1-6
shows inbound connection flow for the Cisco AS5850.
Inbound DS0 Traffic Flow
Backplane
2
T1/E1
T3
CAT5
COAX
1
Modem
Twisted pair
The user PC connects to an attached or internal modem.
The modem call connects to a central office (circuit switched) and is multiplexed into a T1/E1, T3,
or STM1 trunk.
The T1, E1,T3, or STM1 interface is terminated, and individual serial DS0s are sent to port-handling
hardware and software. Universal ports may be located in the same physical slot, as part of a hybrid
trunk card, or in a universal port card (UPC). (See
Universal ports interface with modem protocols and convert TDM data into Ethernet packets.
Ethernet packets are routed and send out through the Fast Ethernet or gigabit Ethernet egress
interfaces to a backbone network.
Appendix A, "Cisco AS5850 Specifications."
OC3/STM-1
Backbone
SMF
Network 1
(Gigabit Ethernet)
Figure
Chapter 1
Cisco AS5850 Product Overview
Cisco AS5850
universal gateway
Backbone
Network 0
(Gigabit Ethernet)
1-3.)
78-10573-06 0A