Harris Intraplex STL-160 Series - Delay Setting with RS-232 Remote Port

ACS-160 Series & STL-160 Series T1 Multiplexer A-ISiCL CM-5RTD Delay Configuration
Version 2.1, April 2011
A-4 Harris Corporation
Intraplex Products
A.4 Delay Setting with RS-232 Remote Port
This method uses ISiCL SET commands with P codes to change the delay value. The ISiCL commands
are sent to the CM-5RTD module through the RS-232 remote port. The settings of P04, P03, and the
least significant bit of P02 are used together to create a 17-bit binary number (Figure A-1); this
number plus five gives the actual instantaneous buffer depth.
Figure A-1. P Codes Used to Change Buffer Depth (Delay Time)
The delay value of the hardware is updated whenever a parameter is changed. Therefore, when
making multiple-byte changes, it is best to update the most significant bits first. Also, when the
desired buffer depth is known only approximately, it may be useful to make a large change in step
mode to the approximate depth first and then make finer adjustments in smooth mode, so as to
minimize both the total time required to make the change and the overall amount of T1 circuit
disruption.
For example, look at a situation where the desired delay is first determined to be approximately 30
milliseconds and closer measurements then indicate that the true target value is 29.95 milliseconds.
First, determine the correct buffer depth (in bits) for the desired delay. Here is the algorithm:
1. Divide the desired delay time by the T1 (1.544 Mbps) bit duration (488 nanoseconds).
2. Subtract five from the result.
3. Look at this number in 17-bit binary format.
For this example, we get
30 mS ÷ 647.67 nS = 46320
46320 – 5 = 46315
Decimal 46315 = binary01011010011101011
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MSBP3P4
29.95 mS ÷ 647.67 nS = 46243
46243 – 5 = 46238
Decimal 46238 = binary01011010010011110
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MSBP3P4
Then, to make these changes, issue this series of ISiCL commands:
:C2:SET:P2=B00000000; Select step change and set most significant bit to 0
:C2:SET:P3=B10110100; Set high-order 8 bits for 30 milliseconds
:C2:SET:P4=B11101011; Set low-order 8 bits for 30 milliseconds