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Channel Service Unit
The channel service unit (CSU) is the interface between the 100D, 100R INA, and 100 DCD modules and the DS1 facility provided by the telephone company. The DS1 facility contains 24 channels on one 4-pair wire.
The 100R INA and 100 DCD modules contain an internal CSU, so no external CSU is needed. However, the CSU in the 100 DCD module is supported only in systems of Release 1.5 or later.
The CSU is a hardware component needed when two endpoints are located in different buildings or when the distance between the two endpoints makes office or line repeaters necessary. The CSU is located on the customer's premises and is used to connect the system to DS1 network facilities. The CSU has the following functions:
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Verify that any CSU on the DS1 circuit between the MERLIN MAGIX Integrated System and the PSTN is programmed for the same framing as the DS1 slot on the MERLIN MAGIX Integrated System. |
There are several external channel service units: ACCULINK 3150 and 3160/3164 ESF T1 CSUs, ESF T1 CSU (no longer available but still supported), and 551 T1 L1 CSU (no longer available but still supported). The ACCULINK 3150 or 3160/3164 CSUs are recommended for this system because they allow maintenance without interrupting service and provide diagnostic and testing capabilities as well as B8ZS line coding. They can be programmed remotely or onsite, using menus. The lower-cost 551 T1 L1 CSU does not provide the B8ZS line coding required for 64-kbps data (clear channel signaling support) and for maintenance features, nor does it provide diagnostic and testing capabilities for the DS1 facility.
