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Request a Quote 120A4 Avaya 120A4 CSU Module The 120A4 CSU Module features: In combination with a DS1 circuit pack, it provides the essential functions of external CSUs; Small size, easier to install than external CSU; Does not require any option switch settings or DS1 cable; Vintage 2 and higher provide enhancements to support the payload loopback function available when the ESF framing format is selected (requires 700A loopback jack). Avaya 120A4 CSU Module