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Appendix D PSAX Module Features
Serial Interface Modules
D-46
255-700-447
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
HDLC Passthrough
Each port on the 6-Port Multiserial module can be configured to perform
adaptation for high-level data link control (HDLC) pass-through. Without
this feature, AAL-1 adaptation would be required for data from HDLC
devices connected to a port on the 6-Port Multiserial module. With this fea-
ture, AAL-5 adaptation can be used to allow HDLC data to be handled as if it
were VBR rather than CBR. Since ATM cells are only generated when HDLC
is present, optimal bandwidth is utilized.
ATM
Each port on the 6-Port Multiserial module can be configured for ATM ser-
vice as per the ATM Forum’s UNI 3.0, 3.1, and 4.0 specifications. With this
feature, a port on the 6-Port Multiserial module can be used as an ATM net-
work interface, using the LANET protocol.
With this feature, statistical multiplexing gains can be achieved over low
speed serial links. By using LANET, the advantages of ATM can be used over
serial links to optimally interleave traffic for efficient bandwidth utilization
and multi-media capability. The LANET protocol efficiently adapts ATM to
low speed, high noise applications such as wireless and satellite. It is a physi-
cal layer protocol that maintains cell extraction capability at bit-error rates up
to 10 to the negative second power (-2). LANET overhead accounts for
0.63% of link bandwidth. It can be implemented over each of the supported
serial interface types, and is independent of the transmission rate.
Hardware Features
The 6-Port Multiserial module provides the following hardware features:
•
Number of ports: 6 serial
•
Connector type: micro-DB15
•
Physical interfaces supported: RS-232, EIA-530, EIA-449, V.35 (subset of
V.11), X.21, and Kg with the Multiservice Media Gateway system config-
ured as either a data terminating equipment (DTE) or a data communica-
tions equipment (DCE) device.
•
Line rate:
~
Minimum: 75 bps per port (asynchronous); 300 bps per port (synchro-
nous)
~
Maximum: 2.048 Mbps per port
~
Aggregate of all ports maximum: 4 Mbps
•
Throughput: 5,000 packets per second maximum
•
Line encoding mode: N/A
•
Loopback capabilities: external DTE loopback
•
Line buildout: N/A
•
Framing modes: cyclic redundancy check multi-frame (CRC-mf), LANET
Quadserial Module (23N07)
The Quadserial module provides four serial ports for several types of serial
data interfaces. Each port on the Quadserial module can be independently
configured for circuit emulation, HDLC Passthrough, frame relay, and asyn-
chronous transfer mode (ATM). Each port on the module provides a maxi-
mum line rate of 16 Mbps and a minimum line rate of 56 Kbps. The maxi-