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- Mfr. Part #: 120A4
- 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 (120A4) provides enhancements to support the payload loopback function available when the ESF framing format is selected (requires 700A loopback jack)
- Condition: Refurbished
- The 120A4 CSU Module is compatible with the following DS1 circuit packs:
- TN464E to TN464HP
- TN2464CP and earlier
- TN767D or TN767E
- TN2313 or TN2313AP
- Supported on Definity, Multivantage, and Communication Manager servers that support TN circuit packs
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