2-10
Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter2 Illustrated Card List for MGX Switches and the MGX 8880 Media Gateway
Front Cards
Front Cards

AUSM

Supported models: MGX 8830, MGX 8830/B, MGX 8850 (PXM1E), MGX 8850 (PXM1E)

AUSM cards are service modules that provide ATM Network-to-Network Interfaces (NNIs)/UNIs that
operate at T1 or E1 rates so that ATM UNI user devices can transmit and receive traffic.
Consistent with the Cisco intelligent quality of service (QoS) management features, AUSM cards
support per-virtual circuit (VC) queuing on ingress and multiple class-of-service queues on egress.
AUSM/Bs fully support continuous bit rate (CBR), variable bit rate (VBR), unspecified bit rate (UBR),
and available bit rate (ABR) service classes.
When the AUSM is combined with a back card, a card set is created. Tab le 2-8 provides information
about each AUSM, interface, and corresponding backcard.
The AUSM cards also support ATM Forum-compliant inverse multiplexing over ATM (IMA) 1.0. This
capability enables multiple T1 or E1 lines to be grouped into a single high-speed ATM port. This n x T1
and nx E1 capability fills the gap between T1/E1 and T3/E3, providing bandwidth up to 12 Mbps
(n x T1) or 16 Mbps (n x E1), without requiring a T3/E3 circuit.
Note For information on AUSM software features and configurations, refer to the Cisco ATM Services
(AUSM/MPSM-8-T1E1) Configuration Guide and Command Reference for MGX Switches, Release 5.2.
For technical specifications for the AUSM cards, see the “Single-Height Service Module Specifications”
section on page A-2.
Table2-8 AUSM Cards, Interfaces, and Supported Back Cards
AUSM
Interface
Connections
# of Lines
Supported
Types of Lines
Supported Supported Back Cards
AUSM-8E1/B NNI/UNI Up to 8 E1 (up to 2.048
Mbps +/–50 bps)
•MGX-RJ48-8E1 (for use in
Australia)
•RJ48-8E1
•R-RJ48-8E1
•SMB-8E1
•R-SMB-8E1
AUSM-8T1/B NNI/UNI Up to 8 T1 (up to 1.544
Mbps +/–50 bps)
•RJ48-8T1
•R-RJ48-8T1