Wavetek ANT-20 Operating Manual

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Wavetek ANT-20 Operating Manual Manual pdf 20 page image

STM-1 mapping ANT-20/ANT-20ES-16 Specifications1.5.1 VC-12 Path Overhead contentsMeasurement channel byte contents (VC-12)• Static bytes: all except bits 1-2 of V5• Overhead sequence m, n, p: J2, N2, K4• Trace Identifier (Length = 16 frames with CRC7 formation): J2• Dynamic bytes filled by DCC/ECC interface (V.11): N2Filler channel byte contents (VC-12)Fixed, non-editable as in (see Tab. S-9).1.5.2 VC-12 error insertion (anomalies)The following anomalies can be inserted in addition to the error types specified inSec. 1.4.2, Page S-4:Error insertion refers to the selected measurement channel.POH byte Measurement channel Filler channelsV5 (binary)LP-BIP (bits 1-2)LP-REI (bit 3)LP-RFI (bit 4)Path Label (bit 5-7)LP-RDI (bit 8)Inserted by parity formation“0”“0”“010” for asynchronous mode“100” for byte-synchronous mode“110” for bulk signal“0”Inserted by parity formation“0”“0”“010” for asynchronous mode“100” for byte-synchronous mode“0”J2 (ASCII) “WG LP-TRACE” “WG IDLE”N2 (hex) “00” “00”K4 (hex) “00” “00”Table S-9 VC-12 POH (Standard Overhead) contentsAnomaly Single RateBIP-21 yes 2E-4 to 1E-10LP-REI yes 2E-4 to 1E-101 Static error insertion, can be edited using a 2-bit mask (x = don’t care, 1 = insert error)Table S-10 Additional available anomalies (VC-12)