Frame Generator Module With Clock Bypass Switch Block S1 - Symmetricom TSG-3800 Series User Manual

Rocker 1 controls the CRC4 function of the E1 framing. When this switch is in the
OFF position, CRC4 coding is enabled. In the ON position, CRC4 coding is
disabled. Set this switch appropriately for the equipment receiving this signal.
The setting of Rocker 2 determines the type of framing used by the E1 frame
generator.
On Rocker 3, the OFF position selects HDB3 encoding. The ON position selects
AMI encoding.
The setting of Rocker 5 determines the multiframe format generated by the T1
frame generator. In the OFF position the Extended Super Frame (ESF) format is
enabled. In the ON position, Rocker 5 enables D4 framing. Set this according to the
equipment using the framed, all ONEs output of the output modules.
SSMs are controlled by Rocker 6. When this function is enabled (Rocker 6 OFF),
the CPU sends a status message to the frame generator, which transmits it through
the Facility Data Link of the ESF signal (Rocker 5 OFF). If the CPU module is
removed from the TSG-3800, the frame generator begins sending the SSM,
"00001000," which indicates "Sync Quality Unknown" in the DS1 ESF signal. SSMs
are disabled when Rocker 6 is ON. This causes all of the message bits on the
Facility Data Link to be sent as ONEs.
Setting Switch Block S1
S1 is located in the upper right corner of the module (see
three rocker switches labeled 1, 2 and 3, which are used to set the bit position in
time slot zero of the not frame alignment word of an E1 signal, where the SSM will
be inserted. By setting these switches to a specific combination of OFFs (switches
depressed on the OFF side) and ONs (switches depressed on the ON side), the
SSM will be inserted into the desired bit position in the bit stream.
Table 6-22 shows the settings of the three rocker switches for each of the five
allowed bit positions. Be careful to set the S1 rockers on both Frame Generators in
the TSG-3800 to the same positions. If this is not done, the SSM will change bit
position when the selected Frame Generator is changed from A to B, or B to A.
Table 6-22. Frame Generator Module with Clock Bypass Switch Block S1
Rocker
1
2
3
1
2
12778474-002-2 Revision F – March 2004
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Bit 4 Bit 5
Off On Off
Off On On
On Off Off
Off On On
Off On On
CPU, Frame Generator, and Clock Modules
T1/E1 Frame Generator Module with Clock Bypass
Figure
Bit 6 Bit 7 Bit 8
On Off
Off Off
Off Off
On Off
Off Off
6-11). It consists of
TSG-3800 User's Guide 201