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DataComm Enclosure Installation
Connect the network to the DataComm 551 by means of the jack labeled
J1, as shown in Figure 2-6.
DataComm FourPak Enclosure
Connect the network to the DataComm 551 by means of the jacks labeled
NET1 through NET4, as shown in Figure 2-7. When you install a
DataComm 551 in slot four (the lower slot), you must install the rear
panel option jumper in the T1 position.
DataComm Modem Shelf Installation
Connect the network to the DataComm 551 as shown in Figure 2-8. Plug
the adapter cable and coupler into the network jack on the rear panel,
then plug the Telco cable into the coupler.
You must use the adapter cable and coupler to connect
the T1 line to the CSU. Plugging the Telco-provided ca-
ble directly into the shelf connector may cause damage
to the CSU or the network.
GDC TriPak Shelf
Connect the network to the DataComm 551 by means of the jacks labeled
J1 through J3, as shown in Figure 2-9. For each DataComm 551 you in-
stall, you must install the appropriate rear panel option jumper in the
T1.5 position.
Universal System Shelf Installation
Connect the network to the DataComm 551 by means of the jacks labeled
NET1 through NET4, as shown in Figure 2-10. When you install a
DataComm 551 in slot four (the rightmost slot) of a quadrant, you must
install the rear panel option jumper in the T1 position.
Span Power Source Connection
In DataComm FourPak, GDC TriPak and Universal System Shelf in-
stallations where the T1 span does not provide its own power, a Telco-pro-
vided source must be connected. The constant current source must be ca-
pable of providing 60 mA dc for simplexing power onto the network data
pairs. (Additionally, you must select the IN position for option jumper X3
on the pc card.) Connect the source's positive lead to terminal 2 (MA IN)
of the 4-position terminal block (labeled TB1 through TB4 on the
DataComm FourPak and Universal System Shelf, TB1 through TB3 on
the GDC TriPak) on the rear panel, as shown in the appropriate figure.
Connect the source's negative lead to terminal 1 (MA OUT). Figure 2-11
is a simplified functional diagram of the CSU configured to (a) loop span-
provided power, or to (b) provide power to the span.
CAUTION
INSTALLATION
2-21
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