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2-8
A situation may exist in which a MEGAMUX PLUS is powered up before the incoming aggregate
clock is present. In this case, the MEGAMUX PLUS will not know what rate to frame to and syn-
chronization with the other end may not occur. Two enhancements in the 4.00 release alleviate this
problem. If no frequency is measured, then the middle status line on the display will flash:
NO AGG RATE - RESET WITHIN 2 MIN
This message will appear for the prescribed amount of time if a key is not pressed on the user con-
sole. The MEGAMUX PLUS will then reset itself provided a user did not manually reset the card.
This will prevent the user from being interrupted (i.e., while in the Configuration Editor routine).
The second enhancement allows the user to reset the card from a new Autoframe diagnostic selec-
tion called "RE-MEASURE AGGREGATE CLOCK." This is so the Autoframe will not have to be
reseated in the shelf or the system powered down.
When a configuration is activated, the TDM "frames" the configuration using the measured aggre-
gate rate. If you have activated a configuration with an incorrect selected aggregate rate, the TDM
drops channels out of the configuration until the sum of the channel baud rates is less than the mea-
sured aggregate rate. The display reports the dropped channels; these channels will not operate until
the configuration is corrected.
CHANNEL CONFIGURATION/PARAMETERS
Most of the work in configuring a system occurs when you select para-meters for each channel. Pa-
rameter selection is determined primarily by two factors:
•
Requirements of the equipment connected to each channel.
•
Requirements of the communications system.
For example, if a terminal is asynchronous, and has a character format of seven data bits and one
stop bit, you will configure the data channel that supports it as asynchronous, with the seven data
bit/one stop bit character format. If the system that the terminal operates in is a polled system, you
will select an interface that supports the system polling requirements.
The following paragraphs discuss the selectable parameters in a channel configuration, and describe
the purpose of each possible selection.
Channel Parameters
Channel parameters are selected in a logical sequence. You must first specify the number of the
channel that you wish to configure. Once a channel number is selected, you enter the channel type
(synchronous, asynchronous, isochronous, transition-encoded, or voice). Once a channel type is se-
lected, there are a range of parameters to be selected; the parameters differ according to the channel
type selected. You are not allowed to select these parameters until a channel type is specified.
The selectable parameters are displayed on the screen as follows:
CURRENT PARAMETERS FOR CHANNEL #01
CHN
CIRCUIT
#
TYPE
01
SYNC
036R660-000, Issue 10
CIRCUIT
BAUD
T-R CLK
NAME
RATE
M/S
NYV1
48.0K
I-I/I-I
System Overview
CONFIGURATION AM
TID-IR OR
VF-DB-LEVEL
DATA STOP
M
S
___
____
I/F
TID
TYPE
MODE/DELAY
CTB1
___
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