Appendix D PSAX Module Features
DS1/T1 Interface Modules
D-4
255-700-447
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
6-Port Enhanced DS1/T1 Module (20N36)
The 6-Port Enhanced DS1/T1 Multiservice module provides six ports, each
with a line rate of 1.544 Mbps. The interfaces support American National Stan-
dards Institute (ANSI) T1.403, af-phy-0016.000 and af-test-0037.000. Each port
can be independently configured to provide services for channelized and
unchannelized frame relay configurations, circuit emulation service, dynamic
bandwidth circuit emulation service, and ATM service. Three light-emitting
diode (LED) status indicators provide the operational status of the module.
The module has built-in channel service unit (CSU) capability that allows it
to interface directly to a DS1/T1 line with multiple repeaters. This feature
allows the module to interface with a time-division multiplex (TDM) chan-
nelized DS1/T1 circuit. Configured for channelized T1 service, the 6-Port
Enhanced DS1/T1 Multiservice module maps up to 24 individual high-level
data link control (HDLC) data links on a single T1 connection (144 HDLC
data links per module). This module also provides a data service unit/channel
service unit (DSU/CSU) for each port in order to configure individual DS0s.
The user can configure this module to provide N x 64 Kbps (fractional DS1)
structured circuit-emulation service. When configured for DS1 circuit-emu-
lation service, the 6-Port Enhanced DS1/T1 Multiservice module interfaces
with TDM channelized DS1 circuits. It converts channelized digital signals
(usually voice data) to ATM virtual channels. This module can adapt a maxi-
mum of 24 DS0 channels 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 is also pro-
vided, based on ATM Forum standards for channel-associated signaling
(CAS). This module can connect to a device using 56 Kbps with 8 Kbps for
robbed-bit signaling per DS0. With the 64 Kbps "clear channel" capability,
the 6-Port Enhanced DS1/T1 Multiservice module can connect to a device
using an 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 6-Port Enhanced DS1/T1 Multiservice module uses an ATM UNI 3.0,
UNI 3.1, or 4.0 interface, which allows any DS1 port to act as a user network
interface (UNI), or an interim inter-switch protocol (IISP) user or network
interface to an ATM network.
Software Features
Multiservices:
•
ATM: ATM UNI 3.0, 3.1,and 4.0; ATM Interim inter-switch signaling proto-
col (IISP) user, IISP network; ATM private network-network interface
(PNNI) 1.0
•
CE: Circuit emulation service (CES) with ISDN PRI using 64 Kbps clear
channel; 1 X 56 Kbps structured CAS; unstructured CES
•
HDLC Passthrough
•
Frame relay UNI and NNI (FRF.1, FRF.2, FRF.5, and FRF.8)
•
PRI ISDN