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INSTALLATION
TABLE 2-1. OPTION APPLICATION NOTES (Cont.)
Option
Selection
Central Office
ANSI mode
Compatibility
AT&T mode
Ground
Common
Isolated
Power to span
Disabled
Enabled
* Factory default position.
2-8
Switch (S) or
Jumper (X)
Position
S7-8
OFF *
S7-8
ON
X2
FG-SG *
X2
FG-100
X3
LOOP *
X3
IN
Description
Selects compliance with ANSI network performance
report messages (per Bellcore TR-TSY-000194),
available only with ESF framing on the network side.
Selects compliance with AT&T TABS network
maintenance messages (per AT&T PUB 54016),
available only with ESF framing on the network side.
Selects common frame (chassis) and signal
(reference) grounds. Grounds are connected
through fusible link FL1.
Selects frame and signal grounds isolated by 100Ω.
DataComm 551 loops power to the span.
DataComm 551 provides power to the span
(requires Telco-provided external 60 mA dc con-
stant current source). Available only in DataComm
FourPak, GDC TriPak, and Universal System Shelf
installations.
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