Chapter 3 System Features
Channelized STS-1e (T1) Module
3-46
255-700-019
PacketStar
™
PSAX 20 Access Concentrator User Guide
, Issue 1
Release 6.3.0
emulation, the Channelized STS-1e T1 module can adapt a maximum of 28
DS-1 channels per port to ATM virtual channels with individual VPIs and
VCIs. Signalling bit transport is also provided, using ATM Forum standards
for channel-associated signaling (CAS). This module can connect to a device
using 56 Kbps or 64 Kbps for service transport, with 8 Kbps for robbed-bit
signalling per DS-0. With the 64 Kbps "clear channel" capability, this module
can connect to a device using ISDN primary rate interface (PRI) service.
Because this structured circuit-emulation service can be configured to use
only a fraction of the time slots, the user can configure several independent
emulated circuits to share one service interface.
The Channelized STS-1e T1 module uses ATM Forum specifications UNI 3.0
or UNI 3.1, which allow any DS-1 port to act as a user network interface
(UNI), or an interim inter-switch protocol (IISP) user or IISP network
interface to an ATM network.
Software Features
The following services are supported:
•
Circuit emulation service (CES) with unstructured and structured DS1
signal transport
•
N X 64 kbps circuit emulation service (1 = N = 24)
•
Primary ISDN service with optional HDLC pass-through mode for the
D-channel
•
Channel-associated signalling (CAS)
The PacketStar
™
Access Concentrator system software supports the
following specifications, agreements, and protocols:
•
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 Specification Version 3.0,
af-uni.0010.001
~
User-to-Network Interface Specification Version 3.1, af-uni.0010.002
~
Integrated Local Management Interface (ILMI) Specification Version 4.0, af-
ilmi-0065.000
~
Private Network-Network Interface (PNNI), Version 1.0
, af-pnni-0055.000
•
Multiservices:
~
ATM: ATM UNI 3.0 and 3.1; Interim inter-switch signaling protocol
(IISP) user, IISP network, ILMI, PNNI
~
CE: Circuit emulation service (CES) with ISDN PRI using 64 Kbps clear
channel; 1 X 56 Kbps structured CAS; unstructured CES
Summary of Contents for PacketStar PSAX 20
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