- Voice Grade - 50-Pair Blocks - USOC Wired - 66BM06-4 = w/ Six 8-Conductor RJ45 Jacks (for four lines per drop) - 66BM08-3 = w/ Eight 6-Conductor RJ11 Jacks (for three lines per drop) - 66BM12-2 = w/ Twelve 4-Conductor RJ11 Jacks (for two lines per drop) Colors:
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