System identification number¶
Broadcast a 15-bit SID code that identifies an AMPS-, TDMA-, or CDMA-family cellular system or service area for roaming and preference decisions.
Core Idea¶
A system identification number is a broadcast numeric identifier assigned to legacy cellular systems so mobiles can recognize home, preferred, and roaming networks. Base stations advertise the code; a mobile compares it with provisioned lists and combines it with other system parameters to select service and roaming behavior. The abstraction is therefore identified by a declared carrier, a transformation or constraint over that carrier, and an invariant that tells an analyst whether the named structure is genuinely present.
The load-bearing residual is not the broad topic of cellular telecommunications. It is the legacy cellular broadcast-identifier namespace and selection semantics.
Scope of Application¶
System identification number belongs to cellular telecommunications and is useful where the analyst can specify a legacy cellular network or service area, base-station broadcasts, mobile-device system-selection tables, and core-network records, then evaluate the code is allocated and broadcast in the SID field under the relevant AMPS/IS-95/legacy standards to identify a cellular system context. The scope is broad within that domain but bounded by the need for the code is allocated and broadcast in the SID field under the relevant AMPS/IS-95/legacy standards to identify a cellular system context. The entry records a descriptive analytical identity; practical use requires the governing domain's evidence, standards, and safety obligations.
Clarity¶
The abstraction clarifies a crowded vocabulary by making the code is allocated and broadcast in the SID field under the relevant AMPS/IS-95/legacy standards to identify a cellular system context the center of the account. A claim should name the carrier, the governing operation or relation, the applicable assumptions, and the recognition test. A bare label is insufficient because the name System identification number can be used for a formal identity, an implementation, or a neighboring result unless carrier and convention are stated.
Manages Complexity¶
Without the abstraction, an analyst must reason directly over many local details: the carrier roles, admissibility assumptions, competing conventions, derived invariants, boundary cases, and proof or validation obligations specific to System identification number. System identification number compresses them into the roles in the structural signature. That compression permits comparison across instances without erasing the variables that determine validity. It also exposes which details may be varied safely and which are constitutive.
Abstract Reasoning¶
- Identify the carrier. State what the elements, states, objects, or observations are: a legacy cellular network or service area, base-station broadcasts, mobile-device system-selection tables, and core-network records. Reject examples whose alleged carrier belongs to a different problem. 2. Lock the constitutive rule. Express the code is allocated and broadcast in the SID field under the relevant AMPS/IS-95/legacy standards to identify a cellular system context independently of one notation or implementation.
Knowledge Transfer¶
Knowledge transfers strongly among subfields of cellular telecommunications because they reuse a legacy cellular network or service area, base-station broadcasts, mobile-device system-selection tables, and core-network records, Base stations advertise the code; a mobile compares it with provisioned lists and combines it with other system parameters to select service and roaming behavior., and decode the exact field width, verify allocation authority and country range, distinguish broadcast from internal values, check SID/NID combinations and conflicts, and state the radio technology. A theorem, diagnostic, or modeling warning can travel when those roles remain literal.
Relationships to Other Abstractions¶
Current abstraction System identification number Domain-specific
Parents (1) — more general patterns this builds on
-
System identification number is a kind of Naming Convention Prime
The proposed strict upward parent is
prime:naming_convention.
Hierarchy path (1) — routes to 1 parentless root
- System identification number → Naming Convention → Standardization
Neighborhood in Abstraction Space¶
System identification number sits in a sparse region of the domain-specific corpus (69th percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.
Family — Network Protocols & Traffic Control (29 abstractions)
Nearest neighbors
- Line code — 0.85
- Transport layer — 0.85
- Automatic switched-transport network — 0.84
- X.75 — 0.84
- Quality of service — 0.84
Computed from structural-signature embeddings · 2026-09-08