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Chapter 3 System Features
Medium-Density DS1 Module
3-62
255-700-025
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
integrated services digital network with a primary rate interface (ISDN PRI)
service, and ATM services.
You can configure the Medium-Density DS1 module to provide N x 64 Kbps
(fractional T1) structured circuit emulation service. When configured for DS1
circuit emulation service, the module interfaces with TDM channelized DS1
circuits. It converts channelized data (usually voice data) to ATM virtual
channels. By using structured (channelized) circuit emulation, this module
can adapt a maximum of 24 DS1channels per port to ATM virtual channels
with individual virtual path identifiers (VPIs) and virtual channel identifiers
(VCIs). Signalling bit transport is also provided, based on ATM Forum
standards for channel-associated signalling (CAS). With the 64 Kbps "clear
channel" capability, this module can connect to a device using an ISDN PRI
service. Because this structured circuit emulation service can be configured to
use only a fraction of the time slots, you can configure several independent
emulated circuits to share one service interface.
The Medium-Density DS1 module uses ATM Forum Specification UNI 3.0 or
UNI 3.1, which allows any DS1 port to act as a user network interface (UNI),
an interim inter-switch protocol (IISP) user or network interface to an ATM
network.
Software Features
The software supports the following Frame Relay Forum (FRF)
Implementation Agreements:
•
FRF.1—User-to-Network Interface (UNI)
•
FRF.2—Network-to-Network Interface (NNI)
•
FRF.5—Frame Relay/ATM PVC Network Interworking
•
FRF.8—Frame Relay/ATM PVC Service Interworking
ATM Forum Technical Committee Specifications:
•
Circuit Emulation Service Interoperability Specification Version 2.0
af_vtoa_0078.00
•
User to Network Interface Version 3.0
•
User to Network Interface Version 3.1
•
Private Network-Network Interface (PNNI), Version 1.0
, af-pnni-0055.000
•
Integrated Local Management Interface Specification Version 4.0,
af-ilmi-0065.000
Multi-Services:
•
ATM: ATM UNI 3.0 and 3.1; Interim inter-switch signaling protocol (IISP)
user, IISP network
•
CE: Circuit emulation service (CES) with ISDN PRI using 64 Kbps clear
channel; 1 x 64 Kbps structured CAS; unstructured CES