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255-700-025
3-53
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
Chapter 3 System Features
E1 IMA Module
~
Frame relay UNI and NNI (FRF.1, FRF.2, FRF.5, and FRF.8)
~
ITU-T I.370 (frame relay policing)
~
Congestion management
~
Traffic policing
~
HDLC pass-through
Frame Relay
The DS3 Frame Relay module has interfaces for frame-relay network-level
interworking (FRF.5) and service-level interworking (FRF.8). A maximum of
350 permanent virtual circuits (PVCs) can be assigned on each frame relay
user-network interface (UNI) port. These features enable the Access
Concentrator system to act as a gateway between routers, remote dial-access
servers, IBM SNA equipment, and other devices configured for frame-relay
operation.
Frame relay policing, and user-selected point-to-point SVCs are supported on
the DS3 Frame Relay module. Frame relay policing enables the user to
manage traffic at the user-network interface (UNI) or network-network
interface (NNI) by setting performance parameters such as the Committed
Information Rate (CIR), Excess Burst size (Be), and Committed Burst size
(Bc).
HDLC Pass-through
Each port on the DS3 Frame Relay module can be configured to perform
adaptation for high-level data link control (HDLC) pass-through. Without
this feature, AAL-1 adaptation would be required for data from HDLC
devices connected to a port on the DS3 Frame Relay module. With this
feature, AAL-5 adaptation can be used to allow HDLC data to be handled as if
it were VBR rather than CBR. Since ATM cells are only generated when
HDLC is present, optimal bandwidth is used.
Hardware Features
•
Number of ports: one
•
Connector type: two BNC connectors for the single port which has one
receive connector and one transmit connector
•
Line rate: 44.736 Mbps (typical)
E1 IMA Module
The E1 IMA module has six physical RJ-45 ports. Inverse multiplexing over
ATM permits a user to strap two to six of the physical ports together to create
ATM interfaces that support 4 to 12 Mbps of bandwidth. A maximum of
three IMA groups may be configured per module.
Source data enters the module from the backplane and is divided between
the ports within the IMA group specified in the virtual circuit connection.
The data leaves the front of the module and is transported across individual
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