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255-700-025
3-57
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
Chapter 3 System Features
Enhanced E1 Module
•
Line rate: 1.544 Mbps
Enhanced E1 Module
The Enhanced E1 module provides six ports, each with a line rate of
2.048 Mbps. The interfaces support ITU-T G.703 and ITU G.704. Each port
can be independently configured to provide services for channelized and
unchannelized frame relay configurations, circuit emulation service, and
ATM service. This module has three types of light-emitting diode (LED)
indicators: FAIL, ACTIVE, and LOS (loss of signal).
Configured for channelized E-1 service, the Enhanced E1 module maps up to
31 individual high-level data links (HDLCs) on a single E-1 connection (180
HDLCs per module). This module provides a data service unit (DSU)/channel
service unit (CSU) for each port in order to configure individual DS-0s. The
module has a built-in CSU capability that allows it to interface directly to an
E-1 line with multiple repeaters. This feature allows the module to interface
with a time-division multiplex (TDM) channelized E-1 circuit.
The user can configure the Enhanced E1 module to provide n X 64 Kbps
(fractional E-1) structured circuit emulation service. When configured for
E-1 circuit emulation service, the module interfaces with TDM channelized
E-1 circuits. It converts channelized data (usually voice data) to ATM virtual
channels. This module can adapt a maximum of 31channels per port to ATM
virtual channels with individual virtual path identifiers (VPIs) and virtual
channel identifiers (VCIs), using structured (channelized) circuit emulation.
Signaling bit transport from time slot 16 is also provided, based on ATM
Forum standards for channel-associated signaling (CAS). With the 64 Kbps
"clear channel" capability, this module can connect to a device using a
integrated services digital network with a primary rate interface (ISDN 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 Enhanced
E1 module uses ATM Forum Specification UNI 3.0 or UNI 3.1, which allows
any E-1 port to act as a user network interface (UNI), an interim inter-switch
protocol (IISP) user or network interface to an ATM network.
Note:
The Enhanced E1 Circuit Emulation (CE) module is functionally
identical to the Enhanced E1 module, except that the Enhanced
E1 (CE only) module provides a license for circuit emulation
functions only.
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