Cisco 7120 Series User Manual page 11

Chapter 1 Overview
Cisco 7120-AT3, Cisco 7120-AE3, and Cisco 7120-SMI3
The Cisco 7120-AT3 provides one high-speed, ATM port that supports full-duplex operation at T3
(45-Mbps) speeds. The Cisco 7120-AE3 provides one high-speed, ATM port that supports full-duplex
operation at E3 (34-Mbps) speeds. The Cisco 7120-SMI3 provides one ATM port that supports
full-duplex operation at OC-3c/STM1 single-mode intermediate reach (155-Mbps) speeds.
These models provide the following features:
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Figure 1-11
router.
Figure 1-11 Cisco 7120-AT3—Back View
Modular port adapter
5
I
EN
LEDs
78-6341-03
Up to 4096 total virtual circuits (open VCs)
Up to 1024 simultaneous segmentations and reassemblies (SARs)
ATM adaptation layer 5 (AAL5) for data traffic
Traffic shaping on a per-VC basis
IP-to-ATM class of service (CoS)
Non-real time variable bit rate (nrt-VBR), unspecified bit rate (UBR), and available bit rate (ABR)
quality of service (QoS)
Operation, Administration, and Maintenance alarm indication signal (OAM AIS) cells
LAN emulation (LANE)
User-Network Interface (UNI) signaling
Integrated Local Management Interface (ILMI)
Loopbacks
RFC 1483 and RFC 1577
shows the back of the Cisco 7120-AT3. Access to the interfaces is located at the back of the
Fast Ethernet 0/0
Service module
TX RX
DS3
RX
CEL CAR ALM
ATM T3 WAN port
ATM 1/0
Fast Ethernet 0/1
SLOT 0 SLOT 1
ACT ACT
LNK LNK
0 1
FE 0 / 0 FE 0 / 1
Fixed LAN ports Console and
auxiliary ports
PC Card
slots (covered)
Cisco 7100 Series VPN Router Installation and Configuration Guide
Cisco 7120 Series Overview
PWR
0
SYS
CONS AUX
RDY
2
7120 - AT3
Power supply
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