Installing The Ami 20-Output Module; Primary And Secondary Distribution Slots; T1 Line Length Selections - Symmetricom TSG-3800 Series User Manual

Output Modules
AMI 20-Output Module
Finally, the output drivers must be configured for the length of cable being used.
This is accomplished by setting the LEN0, LEN1 and LEN2 rocker switches in S1.
Table 7-4 shows the possible switch settings, the option selected and the
applications. If the module is generating E1 signals, these switches do not affect the
outputs, and can be set to any value except all On. A safe setting for these three
switches is all Off when E1 signals are being generated.
Set these three switches for your application. Remember the settings apply to all 20
outputs of the AMI Output module, which means that the same length and type of
cable must be used on all outputs for the pulse shapes to be correct. If the cable
length is not known, change the switches while monitoring the wave shape until a
suitable wave shape is obtained. This may also be a useful method for setting the
switches when different types of cables are used, see
Table 7-4. T1 Line Length Selections
LEN2
ON OFF
OFF ON
OFF ON
OFF OFF
OFF OFF

Installing the AMI 20-Output Module

The AMI 20-Output modules are designed to operate in pairs. Insert one module in
the primary distribution slot; insert the other in the secondary distribution slot.
7-5 lists the primary and secondary distribution slots in the TSG-3800 series.
Table 7-5. Primary and Secondary Distribution Slots
Model
3800/3800E
19-inch Shelves
3800 23-inch
Shelf
3800X/3800EX
19-inch Shelves
3800X 23-inch
Shelf
212 TSG-3800 User's Guide
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LEN1 LEN0
OFF 0–133 feet (0 – 40 m)
ON 133–266 feet (40–80 m)
OFF 266–399 feet (80–120 m)
ON 399–533 feet (120–160 m)
OFF 533–655 feet (160–197 m)
Primary Distribution Slots
18, 20
18, 20, 22
4, 6, 8, 10, 12, 14, 16, 18, 20
4, 6, 8, 10, 12, 14, 16, 18, 20,
22, 24
Table 7-4.
Option Selected
Secondary Distribution Slots
19,21
19, 21, 23
5, 7, 9, 11, 13, 15, 17, 19, 21
5, 7, 9, 11, 13, 15, 17, 19, 21,
23, 25
12778474-002-2 Revision F – March 2004
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