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TABLE 1-4 Tie Line Preferred Signaling Formats (continued)
Insulation Situation
Preferred Signaling Format
From
MERLIN II System MERLIN II System
Far End
Signaling Protected Signaling
Protected
Mode and or
Mode and
or
To
Location
Type Unprotected Type Unprotected
Other Inter- E&M
Protected
E&M
Requires a
building Type 1
Type 1 protection
Compatible
Standard
unit
Network
…
E&M
Unprotected Either
Either
interface
Type 1
Standard
Theory of Operation 1-51