Cisco Systems AS5850 manual Traffic Flow, OC3/STM OC3/STM-1 SMF RSC

Chapter 1 Cisco AS5850 Product Overview

Functional Overview

Adial 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 Appendix A, “Cisco AS5850 Specifications.”

Traffic Flow

Figure 1-3shows inbound connection flow for the Cisco AS5850.

Figure 1-3 Inbound DS0 Traffic Flow

Backplane

trunk card	universal port card
T1/E1	T3

2

T1/E1 T3

CAT5 COAX

1

Modem

Twisted pair

1 trunk card	universal port card
OC3/STM-

OC3/STM-1

SMF

RSC	Cisco AS5850
	universal gateway

GigE egress

Backbone Backbone

Network 1 Network 0

(Gigabit Ethernet) (Gigabit Ethernet)

72964

A typical user connection flows as follows:

1.The user PC connects to an attached or internal modem.

2.The modem call connects to a central office (circuit switched) and is multiplexed into a T1/E1, T3, or STM1 trunk.

3.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 Figure 1-3.)

4.Universal ports interface with modem protocols and convert TDM data into Ethernet packets.

5.Ethernet packets are routed and send out through the Fast Ethernet or gigabit Ethernet egress interfaces to a backbone network.

	Cisco AS5850 Universal Gateway Hardware Installation Guide
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