Section DTW-A52-804-202
030-101667 Rev. A
R
3
0802I2RA
Figure 3. 528-04I2 Interior View, Cover Open,
Typical Tabletop-Mounted Position
Card Guides
56-Pin Card-Edge
Hinged Cover
Swing-Open
For Modules
Wire/Cable Access
Rear-Accessible
Customer RJ Jack,
Power/Ground
Ribbon Cable
(4 sets)
(1 of 4)
(1 of 4: J1 - J4)
(4-Position)
Terminal Block
See-through
Module Window
Network
(2 of 4)
Terminal Blocks*
Connectors
Wiring Label
*The List 9 Option contains wirewrap
pin headers instead of screw terminals.
blocks (TB1, TB2, TB3 and TB4) or to jacks J1-J4 (either RJ48C
or RJ48S-type modular jacks), as listed in Table 3. Use Switches
S1-S4 to select the desired and correct configuration, either RJ48C
or RJ48S. Table 6 lists CPE connections.
Circuit/Slot #
Terminal Block/Wirewrap Header
RJ48C/S
1
TB1
J1 (CKT 1)
2
TB2
J2 (CKT 2)
3
TB3
J3 (CKT 3)
4
TB4
J4 (CKT 4)
Table 3. Customer/CPE Connections
S1-S4 Position
Application Type
RJ48C
T1, Hi-Cap, NIU, HDSL
RJ48S
Analog Data Services, DST Module, Digital Data Service,
DDI Module, IDSL (ISDN DSL)
Table 4. S1-S4 Positions for Typical Applications/Modules
2.3
S1-S4 Slide Switches
The 528-04I2 contains four slide switches, S1 (CKT 1) through S4
(CKT 4), to provision the J1-J4 customer RJ48 jacks for use in ei-
ther an RJ48C or an RJ48S configuration. If the customer
application requires RJ48C jacks, set S1-S4 to the RJ48C position.
If the customer application requires RJ48S jacks, set S1-S4 to the
RJ48S position. If 400-type modules (twice the width of 200-type
Figure 4. Rear View of 528-04I2
RJ48C/S Connectors
J1 - J4
Ground Lug
Cable
Access
Hole
modules) are used in the assembly, one can be inserted into circuit/
slot #1 (top slot when in the closed position) which interfaces with
J1 and S1. The other 400-type module can be inserted into circuit/
slot #3 and interfaces with J3 and S3.
2.4
TB9 - Power and Ground Connections
TB9 is a 4-position screw terminal block for power and ground con-
nections to the assembly. The four positions are +PWR, FRAME
GND, -PWR, and CIRCUIT GND (Table 7). The +PWR position
is used to connect the positive terminal from the
Part A90-204100
(117 VAC to -48 VDC), or equivalent power supply. FRAME
GND is available as an option to connect to Earth ground as stated
in Paragraph 2.5. CIRCUIT GND must be connected to an earth
ground regardless of the power source. Use an insulated wire of 24
AWG or greater (see Figure 6 and Figure 7). The -PWR position
is used to connect the negative terminal from the
Model
A90-204100 (or equivalent 48 volt power supply).
2.5
Frame Ground Connections
The metal housing can be connected to earth ground by using one
of the methods below. On some units, this optional strap is pro-
vided in the parts bag, and on the DTMA528-04L4 it is factory
installed.
S
Exterior Frame Ground Lug on Rear of Assembly (Preferred
Method).
A chassis ground lug, labeled FRAME GND, is
provided on the rear of the metal housing. This (Refer to Fig.
4) lug should be used to earth ground the metal housing.
S
Interior TB9 Frame Ground Screw Terminal (Inside Assem-
bly)
. A chassis ground screw terminal on TB9, labeled FRAME
GND, located inside the assembly can be used as an optional
method for earth-grounding the metal housing (Figure 4,
Figure 5, Figure 6 and Figure 7) when local power is supplied.
S
Optional Interior TB9 Removable Ground Strap.
The 528-04I2
features a factory-assembled, pre-installed, ground strap for
applications requiring chassis ground to be connected to circuit
ground. The strap is connected across TB9’s FRAME GND and
CIRCUIT GND terminals. On some units, this optional strap
is provided, but not factory-installed.
