The 120A Is small and easier to install than an external CSU, and does not require any option switch or DS1 cable.
Features:
- The 120A channel service unit (CSU) module connects to either a TN464/F or a TN67D/E DS1 circuit pack on 1 end. The other end connects to the network interface smart jack
- The 120A is powered from the +5 VDC port carrier power supply and uses a maximum of 1.2 Watts
- In combination with the DS1 circuit pack, it provides the essential functions of external CSUs. The TN464/767 and switch administration support all framing and line coding options
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