Nortel Networks 8672ATMM - Manual (Page 24)

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The DS-3 MDA uses a 75 ohm coaxial cable. Table 5 describes
the DS-3 MDA.
Table 5 DS-3 MDA specifications: 8672ATME and
8672ATMM Modules
Parameter Specification
Line rate 44,736 Mb/s (20 ppm)
Impedence 75 ohms
Maximum length 450 feet (135 m)