Chapter 2. Installation and Setup ASM-10/8
Installation and Operation Manual
2-6 Installation and Setup 09/10/00 16:26
Table 2-1 ASM-10/8 Internal Jumpers and Switches (Cont.)
Item Jumper Description Values Default Setting
15 DIP Switch The DIP switch consists of four sections. The S1 section is reserved for future use.
S2 Selects the amount of sto
p
bit
shortening to be used in async mode.
ON – 25%
OFF – 12.5%
OFF
S3, S4 Selects character length in async mode S3 S4 No of bits
Refer to Configuration Considerations OFF OFF 8 BIT
below for detailed explanation. OFF ON 9 BIT
ON OFF 10 BIT 10 BIT
ON ON 11 BIT
16 V.54-DLY Controls the V.54 delay to prevent
multiple loopbacks.
Refer to Confi
g
uration Considerations
below for detailed ex
p
lanation of the
V-54 delay settings.
ON – V.54 delay
enabled
OFF – V.54 delay
disabled
OFF
Configuration
Considerations
Setting AGC and CTS Delay
The ASM-10/8 receiver consists of the following components:
• The receiver filter, which removes all the out-of-band frequencies.
• The automatic equalizer, which comprises several equalizers activated
according to baud rate.
• The digital AGC, which automatically compensates for the attenuation of
the line.
The following are general recommendations for the setup position of the
AGC and CTS delay:
• For point-to-point applications, set AGC to ON and CTS delay to 8 msec.
• In multipoint or star applications, the AGC and CTS delay settings
depend on the distances between the modems (see Table 2-2 and Table
2-3).
Table 2-2 AGC and CTS Delay Settings for Short-Range Applications
Range Rate AGC Setting CTS Delay Setting
Less than 4.5 km
6 km
9.6 to 19.2 kbps
3.6 to 7.2 kbps
CTRL (master and slave) 0 msec (master)
4.8 kbps 8 msec (slave)
2.4 to 4.8 kbps 8 msec or 64 msec
(slave)
2.4 kbps and below 64 msec (slave)
Note: The selection between delays depends on the polling environment behavior. Therefore, it is different
from application to application