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Configuration
TID-III (Time Independent Data III) Module Options
The TID-III is configured using both hardware and software options. Refer to the MEGAMUX
PLUS Instruction Manual GDC publication 036R360 for dip switch and jumper placement on the
TID-III Module: Once the hardware is configured, the user will establish the application modes for
the TID-III using the MEGAMUX PLUS supervisory controller.
Before attempting to set up or operate the TID-III module, the user must first select a system appli-
cation mode number. Five application modes are available which are dependent upon user and sys-
tem requirements.
TID-II (ECH-12) Emulation Mode (Modes 1-3)
This mode is applicable when the remote end of the communications link (from a TDM 1257/1258,
MEGAMUX PLUS or MEGAMUX TMS) is a TID-II (ECH-12) module, or when the user requires
TID-II performance characteristics over a communications link between two TID-II modules. This
mode provides three modes which allow the user to optimize communications depending upon
channel rate and the characteristics of the channel input clock. These three operation modes are:
ACCURACY TRACKING (Mode 1)
This mode is used for extremely accurate input clock rates and when the user desires to track and
output the clock rate with lowest possible offset. In this mode, the TID-III module will track an in-
put clock with accuracies to as high as ±0.006×l. depending upon the input rate.
PROGRAM TRACKING (Mode 2)
This mode allows the user to program the TID-III to control signal input and output rate offsets and
data delays within specified ranges, and thereby optimize communications for variable external
clock characteristics.
INPUT TRACKING (Mode 3)
This mode is similar to the ECH-11 emulation mode described below. This mode allows the user
to support communications where the input frequencies may vary ±1.5% from the reference fre-
quency due to external clock inaccuracies. When input clock inaccuracies are expected to exceed
this threshold, the user should select operation in Mode 4 (TID-I Emulation Mode).
TID-I (ECH-11) Emulation Mode (Mode 4)
This mode is applicable when the remote end of the communications link (from a TDM 1257/1258,
MEGAMUX PLUS or MEGAMUX TMS) is a TID-I (ECH-11) module, or when the user requires
TID-I performance characteristics over a communications link between two TID-III modules.
Mode 4 should be selected when the channel input rate offsets are expected to be greater than ±1.5%
from the reference frequency due to clock inaccuracies or instability. To select TID-I Emulation
Mode, configure the TID-III module for Mode 4.
Automatic Tracking Mode (Mode 5)
Operation in the automatic tracking mode supports communications where input rates are subject
to change in response to system configuration requirements. To operate in the automatic mode, the
user first selects a maximum predetermined input rate, and the TID-III module will support all
channel rates up to this pre-selected maximum. Operation in the automatic mode is supported only
by the TID-III module; therefore, the remote end of the link must also be a TID-III module. To se-
lect Automatic Tracking Mode, configure the TID-III Module for Mode 5.
The TID-III module can support special interface applications via an optional interface adapter pig-
gyback board. Virtually any special channel interface or data conversion requirement can be ac-
commodated to customer specifications. Contact GDC with your specific requirements.
036R660-000, Issue 10
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