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Configuration
TID-III Configuration Requirements
With the variety of features and operation flexibility available with the TID-III module, it is im-
portant to review system communications requirements and constraints before attempting module
set-up. The factors to consider are:
•
Which type of TID-III module will be on the remote end of the link (e.g., TID-I, II, or III)?
The answer to this question directs you to one of the system application modes. If TID-III
modules are at both ends of the link, the user has the option to select any of the five
application modes or three operation modes.
•
What are the characteristics of the input and output clocks? Since all clocks exhibit varying
degrees of inaccuracy, this answer will allow the user to select a mode/submode which
optimizes communications with respect to clock accuracy and stability.
•
Are there any special communications requirements, such as non-standard rates or
automatic alternate rates, on system configuration changes? If there are, the user should
consider the applicability of the automatic mode of operation.
•
Are there any special module interface requirements (for example, a requirement to convert
encoded data from one standard to another prior to channel input)? If there are, the user
should consult GDC regarding the applicability of our optional interface adapter
piggyback.
Having reviewed the system application requirements and options, the user may proceed with
TID-III module setup.
TID-III Module Configuration
The MEGAMUX PLUS must be in the 4.0 mode before you can configure a TID-III Data Chan-
nel Module. The following TID-III configuration procedure assumes you have knowledge in con-
figuring a standard data channel using the MEGAMUX PLUS supervisory controller:
a. To configure a TID-III, go to the Channel Configuration screen.
b. Choose the desired channel number.
c.Under circuit type select TID.
d.Select the data rate the TID-III channel will operate at.
The data rate value appears under the TID-IR (TID-Isochronous rate) field.
The I/F display does not apply for TID-III channels, therefore, it is skipped.
e. The T-R/CLK and M/S field is always set for E-I/E-I timing. The clock source cannot be
changed.
f. You must now set the TID-III mode and delay. Use the cursor key to select the TID-III operat-
ing mode. From the TID-III Module Option, you should know the mode to operate in. Select us-
ing the cursor key. The choices are given in Table 5-1.
NOTE
Channel slots 1, 12, 23, or 39 cannot have a TID-III card installed
due to physical size of the card. This is also the reason the next lower
slot from a TID-III cannot be occupied.
NOTE
The baud rate value displayed is always greater than the TID-IR or
DATA/STOP Bit rate because of overhead.
5-17
036R660-000, Issue 10
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