MERLIN LEGEND MODULES
100D Expansion Module
Adds a T-1 or ISDN PRI with built-in CSU/DSU.
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Adds 1 DS1 circuit which can be configured for either T-1 or ISDN Primary Rate Interface (PRI)
Configured as a T-1: provides 24 digital channels operating at 64kbs
Configured as an ISDN PRI: provides 23 digital channels and 1 bearer channel
Limit of 3 DS1/INA modules per system - Limit of 2 per carrier