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Unprotected mode: Must be used for the E&M
Type 1 Standard interface in order to meet voltage
drop criteria for the interface. This mode is used
when there is a network interface.
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Protected mode: Resistance is added in tie M lead
to provide additional protection from foreign
voltages and transients. This mode is used on local
tie lines, such as between systems in different
buildings.
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Simplex mode: The signaling leads are superimposed
onto the analog transmission leads to provide a two-
pair interface. Resistance is included in the signaling
leads for protection from foreign voltages and
transients. This mode is used primarily with E&M
Type 5 signaling on local tie lines.
Signaling Type
Signaling type designates the logical
signaling used. There are the following three options:
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Type 1 Standard (default): The M leads are used for
signaling from PBX to line. Off-hook is -48 VDC and
on-hook is local ground. Signaling in the other
direction uses local ground for off-hook and open for
on-hook.
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Type 1 Compatible: This interface is back-to-back
compatible with Type 1 Standard. It allows direct
connection between systems where no intermediate
signaling equipment is used.
●
Type 5: A symmetrical 2-wire arrangement that signals
in both directions by means of open for on-hook and
ground for off-hook. The primary application of Type-
5 interface is local tie lincs.
1-48 Theory of Operation
Содержание administration and
Страница 1: ...AT T 518 600 016 MERLIN II COMMUNICATIONS SYSTEM Installation Administration and Maintenance Manual ...
Страница 40: ...FIGURE 1 9 System architecture Theory of Operation 1 37 ...
Страница 175: ...Top cover Front cover FIGURE 2 27 Control unit covers Testing the System 2 107 ...
Страница 177: ...Top cover E m p t y m o d u l e FIGURE 2 28 Installing the control unit top cover Testing the System 2 109 ...
Страница 179: ...Front cover E m p t y module FIGURE 2 29 Installing the control unit front cover Testing the System 2 111 ...
Страница 211: ...FIGURE 3 I A MERLIN II System Display Console The Administrator Attendant Console 3 3 ...
Страница 213: ... FIGURE 3 2 A BIS 34D Console The Administrator Attendant Console 3 5 ...
Страница 217: ...1 1 FIGURE 3 3 Administration Menu for MERLIN II System Release 3 The Administrator Attendant Console 3 9 ...
Страница 218: ...t FIGURE 3 4 Administration Menu for MERIJN II System with Feature Module 2 3 10 The Administrator Attendant Console ...
Страница 331: ...General Tests 4 55 Reaming the Control Unit 4 55 Testing Outside Lines 4 56 ...
Страница 389: ...Section 5 Ordering Information Ordering Information 5 1 Product Listing 5 1 Ordering Information 5 1 ...