255-700-447
D-47
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Appendix D PSAX Module Features
Serial Interface Modules
mum aggregate port rate is 32 Mbps. The Quadserial interfaces support
synchronous RS-232, EIA-449, EIA-530, EIA-530A, V.35
2
, X.21, and Kg.
Each port can be independently configured as either data terminating equip-
ment (DTE) or data communications equipment (DCE).
The Quadserial module also supports bit stuffing and 56K–64K circuit emula-
tion service (CES) conversion, available as standard features in the
Release 9.0.0 software. The framing for SS7 Message Transfer Part (MTP)
Level 2 is a modified version of high-level data link control (HDLC). The dif-
ference between SS7 MTP framing and standard HDLC is in the opening and
closing 1-byte flag. The 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 Quadserial 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 AAL1 adaptation) to a native Quadserial (TDM) or CES
(TDM) circuit. The SS7 traffic can originate from the Quadserial interface and
terminate on the Enhanced DS1 interface.
Software Features
The Quadserial module supports the following services:
•
ATM: ATM UNI 3.0 and 3.1; Interim inter-switch signaling protocol (IISP)
user, IISP network; PNNI user, PNNI network
•
CE: Circuit emulation service (CES) with AAL1 adaptive clocking and
unstructured DS1 or E1 interfaces configured in accordance with AF-
VTOA-0078.000
•
HDLC Passthrough
•
Frame relay UNI and NNI (FRF.1, FRF.2, FRF.5, and FRF.8)
•
ITU-T I.370 (Frame relay policing)
•
Congestion management
•
Traffic policing
Hardware Features
The Quadserial module provides the following hardware features:
•
Number of ports: 4 serial (serial interface leads comply with AF-VTOA-
0119.000)
•
Connector type: Mini-DB26
•
Line rate (synchronous):
~
Minimum: 56 Kbps per port
~
Maximum: 16 Mbps per port
~
Aggregate of all ports maximum: 32 Mbps
•
Physical interfaces supported: RS-232, EIA-530, EIA-530A, EIA-449, V.35
(subset of V.11 ), X.21, and Kg with the Multiservice Media Gateway sys-
tem configured as either a data terminating equipment (DTE) or a data
communications equipment (DCE) device
2
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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