Appendix D PSAX Module Features
Serial Interface Modules
D-44
255-700-447
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
~
Wink-start, 2-way and User
~
Off-premises station (OPS)
Tones
•
Busy tone
Hardware Features
The Tones and Announcements Server module has 32 digital signal processer
chips. All TAS modules connect to the CPU and other modules by a back-
plane connection.
The number of Tones and Announcements Server modules supported by the
PSAX 4500, PSAX 2300, PSAX 1250, and PSAX 1000 Multiservice Media
Gateways depends on how your network configuration is affecting PSAX
System CPU memory availability. (See the Power Consumption table in the
Memory Allocation and Power Consumption section of this document to cal-
culate your network load). A TAS module can be placed in any available I/O
slot on these chassis.
Serial Interface Modules
6-Port Multiserial Module (20N07)
The 6-Port Multiserial module provides several types of serial data interfaces,
with a maximum line rate of 2.048 Mbps, and a maximum aggregate rate of
4 Mbps.
Bit Stuffing and CES
Conversion
The module also supports bit stuffing and 56K–64K circuit emulation service
(CES) conversion.
The framing for SS7's Message Transfer Part (MTP) Level 2 is a modified ver-
sion of HDLC. The difference between SS7 MTP framing and standard HDLC
is in the opening and closing 1-byte flag. SS7 MTP messages use only the
closing flag. In order to support external SS7 transport requirements, it is
necessary to exchange information via T1 circuits where each 64 Kbps DS0 of
the T1 is filled with 56 Kbps of SS7 data and 8 Kbps of overhead (stuffing)
data.
The SS7 circuits originating from the Multiserial interface can be mapped
using AAL1 to an individual ATM constant bit rate (CBR) class of service
exiting on a DS3 ATM cell-bearing interface. At the far-end, the ATM circuit
is adapted (based on AAL-1 adaptation) to a native Multiserial (TDM) or CES
(TDM) circuit. SS7 traffic can originate from the Multiserial interface and ter-
minate on the Enhanced DS1 interface.
Interfaces
The interfaces support RS-232 (synchronous and asynchronous), EIA-449,
EIA-530, V.35
1
, X.21, and Kg. For synchronous interfaces, each port can be
independently configured as either data terminating equipment (DTE) or
data communications equipment (DCE). Each port can be independently
1
V.35 has been superceded by V.11. Although the V.35 protocol is a subset of V.11,
V.35 more accurately describes the module’s capabilities.
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