like it says, the equivalent of 20 E1's or 28 T1's
and I guess you know how many channels a E1 or T1 PRI is
That is correct; the DS3000P will support full access to every channel on the DS-3 (or E-3), however it is provisioned. In a T1-RBS signaling mode, that means 672 voice channels. In a T1-PRI signaling mode, it could be as many as 670 or as few as 644, depending on how many D-channels are provisioned.
The same logic applies to E-3 mode: since an E-3 is the equivalent of 16 E-1, the channel capacity will vary from 496 to 480, depending on signaling mode.
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