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Chapter 4 Troubleshooting and Diagnostics ASM-20 Installation and Operation Manual
4-6 Frequently Asked Questions
4.6 Frequently Asked Questions
Q. How is the new version of ASM-20 different from the older version?
A. ASM-20 has been improved in order to get CE mark approval and has some
new features. A different ordering name, ASM-20-2, was given to the newer
version. Presently, any order received for ASM-20 or ASM-20-2 will be delivered
as ordered until the stock of existing ASM-20 products is depleted. After the stock
is depleted, orders for any version will be delivered with the new ASM-20-2
boards only.
The following table describe the differences between the old ASM-20 and the new
version.
Table 4-1. Differences in Versions
ASM-20 ASM-20-2
Non-modular interfaces (V.24,
X.21 etc.); part of the main board
Modular interfaces
Two ordering options for
synchronous rates:
32 kbps - 128 kbps
32 kbps - 144 kbps
All synchronous rates from
19.2 kbps - 256 kbps.
No Ethernet support Ethernet built-in bridge
Metal box Plastic box
Terminal block with screws Clip terminal block
Main chip RJ008 and external
BERT chip
Main chip RJ016 which includes
BERT chip
No CE mark CE mark
No asynchronous transmission Asynchronous transmission
capability
The above versions are compatible with each other within similar synchronous
rates.
Additionally, the ASM-20-2 has been improved in order to get a better line surge
protection. In many cases line surges are caused by lightening strikes. The
improved line protection of ASM-20-2 complies with the ITU-T/K.21 standard.
The line interface has been modified by adding two Gas surge protection diodes
and another two Transorber surge protection diodes. The Gas diodes protect
against line surges above 300V and the Transorber diodes protect against surges
below 300V.