DS21455 Maxim Integrated Products, DS21455 Datasheet - Page 195

• Manufacturer Part Number: DS21455
• Description: Network Controller & Processor ICs Quad E1-T1-J1 Single -Chip Transceiver (S
• Manufacturer: Maxim Integrated Products

Specifications of DS21455

• Product: Framer
• Number Of Transceivers: 4
• Data Rate: 64 Kbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 328 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Package / Case: BGA

28. PAYLOAD ERROR INSERTION FUNCTION
An error-insertion function is available in the DS21455/DS21458 and is used to create errors in the
payload portion of the T1 frame in the transmit path. Errors can be inserted over the entire frame or on a
per-channel basis. The user can select all DS0s or any combination of DS0s. See the Special Per-Channel
Registration Operation section for information on using the per-channel function. Errors are created by
inverting the last bit in the count sequence. For example, if the error rate 1 in 16 is selected, the 16th bit is
inverted. F-bits are excluded from the count and are never corrupted. Error-rate changes occur on frame
boundaries. Error-insertion options include continuous and absolute number with both options supporting
selectable-insertion rates.
Table 28-1. Transmit Error Insertion Setup Sequence
STEP
2A
2B
or
1
Enter desired error rate in the ERC register. Note: If ER3 through ER0 = 0,
no errors will be generated even if the constant error insertion feature is
enabled.
For constant error insertion set CE = 1 (ERC.4).
For a defined number of errors:
− Set CE = 0 (ERC.4)
− Load NOE1 and NOE2 with the number of errors to be inserted
− Toggle WNOE (ERC.7) from 0 to 1, to begin error insertion
ACTION
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