1. Subscriber Network Interface. Interface for SMDS-based networks that connects CPE and an SMDS switch. See also UNI. 2. SNA Network Interconnection. IBM gateway connecting multiple SNA networks.

Standard Network Interface. Aka Telephone Network Interface (TNI) or Network Interface (NI), terminating phone service at a customer location while providing lightning protection. One side of the SNI is for phone company use, the other side provides access for customer phone lines.

(In IBM SNA) The way in which autonomous SNA networks can be connected, while still allowing them to be independently managed.

SNi or Substitution Nucleophilic internal stands for a specific but not often encountered nucleophilic aliphatic substitution reaction mechanism. A typical representative organic reaction displaying this mechanism is the chlorination of alcohols with thionyl chloride and the main feature is retention of stereochemical configuration. Thionyl chloride first reacts with the alcohol to form an alkyl chloro sulfite.

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