Acx Series Router Architecture; Junos Os; Interfaces; Mobile Backhaul - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

ACX Series Router Architecture

Junos OS

Interfaces

Mobile Backhaul

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The ACX Series router is a single-board router with a built-in Routing Engine and one
Packet Forwarding Engine that has two "pseudo" Flexible PIC Concentrators (FPC 0 and
FPC 1). Because there is no switching fabric, the single Packet Forwarding Engine takes
care of both ingress and egress packet forwarding.
Routing Engine—Provides Layer 3 routing services and network management.
Packet Forwarding Engine—Performs Layer 2 and Layer 3 packet switching, route
lookups, and packet forwarding.
The general architecture for ACX Series routers is shown in
Figure 1: ACX Series Router Packet Forwarding and Data Flow
Ingress classification
In order of
decreasing precedence:
Incoming packet
MF classification (DFW)
Fixed classification
BA classification
The ACX Series router is powered by Junos OS, supporting extensive L2 and L3 features,
IP/MPLS with traffic engineering, rich network management, fault management, service
monitoring and Operation, Administration, and Maintenance (OAM) capabilities, and an
open software development kit (SDK) system that allows providers to customize and
integrate operations with their own management systems. For a list of related Junos OS
documentation, see
http://www.juniper.net/techpubs/software/junos/
As part of the mobile backhaul, the ACX Series router at the cell site and the MX Series
router at the aggregation layer provide comprehensive end-to-end Ethernet, MPLS, and
OAM features with the one Junos OS running on both platforms.
The ACX Series routers support time-division multiplexing (TDM) T1 and E1 interfaces
and Gigabit Ethernet (10GbE, 100GbE, 1000GbE copper, and 1GbE and 10GbE fiber)
interfaces to support both the legacy and evolution needs of the mobile network. Support
for Power over Ethernet Plus (PoE+) at 65 watts per port mitigates the need for additional
electrical cabling for microwaves or other access interfaces.
In the mobile backhaul scenario, the ACX Series router is primarily used in the access
layer as the cell site router and the MX Series router is used as the edge and aggregation
router. As the cell site router, the ACX Series router connects the base station (BS) to
the packet network. Several cell site routers can be connected in a ring or hub-and-spoke
fashion to the upstream preaggregation and aggregation routers (MX Series routers).
Buffering Queuing Scheduling
Copyright © 2017, Juniper Networks, Inc.
Figure 1 on page 4.
Outgoing packet
Egress rewrite