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Installation and Setup
Shelf Connections
The backplanes of two SC 5000 shelves can be linked by cables so that a total of 32 card slots
function as though connected to the same backplane. In that way, one SCM can be responsible for
control functions for up to 31 other devices.
SC 5000 Shelf Back Panel
Figure 2-1
shows the back panel of an SC 5000 shelf equipped with dual RJ48 connectors in Zone
1. When an SC 553 DSU is used with dual RJ48 connectors in Zone 1, it employs the upper
connector as its network interface.
An SC 553 DSU installed in an SC 5000 shelf always employs the DB25 connector in Zone 3 as its
DTE interface.
The shelf is shown with two 8-slot Zone 1 connector panels that have two
RJ48 modular jacks per slot. An SC553 DSU uses the upper jack for its
slot (J17 to J32) as the T1 interface for network connection.
An SC553 DSU can use the lower jack for its slot (F33 to J48) either as the
interface for connection of a station clock, or as a Cascade Port when the
DSU is equipped with and optional Cascade Interface Card.
Zone 1
J32
J30
J31
J48
J46
J47
Zone 2
THIS EQUIPMENT COMPLIES WITH THE REQUIREMENTS FOR A
CLASS A COMPUTING DEVICE IN FCC RULES PART 15 SUBPART J.
J52
OPERATION OF THIS DEVICE IN A RESIDENTIAL AREA MAY CAUSE
HARMFUL INTERFERENCE REQUIRING THE USER TO TAKE WHAT-
EVER STEPS MAY BE NECESSARY TO CORRECT THE INTERFER-
J16
J15
J14
Zone 3
J52: 30-pin signal
bus connector
16-slot Zone 3 connector panel shown
with one DB25S connector (J1 to J16) per slot.
DTE cable for SC553 DSU attaches to DB25
that corresponds to the slot containing the DSU.
Figure 2-1
2-2
J25
J29
J28
J27
J25
J42
J45
J43
J41
J44
J13
J12
J11
J10
J9
SpectraComm 5000 Shelf Back Panel
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
J51: 40-pin signal
bus connector
J22
J21
J20
J23
J19
J24
J39
J38
J37
J36
J35
J40
J8
J7
J6
J5
J3
J49: 50-pin power
bus connector
J50: Shelf add ress
jumper
General DataComm, Inc.
.
Middlebury, CT
MS - 1
MODEL:
S/N
THIS ENCLOSURE MAY CONTAIN FCC
REGISTERED EQUIPMENT. SPECIFIC
REGISTRATION INFORMATION IS
CONTAINED ON INDIVIDUAL UNITS
CAUTION HIGH VOLTAGE
DISCONNECT POWER
J51
BEFORE SERVICING
J49
LISTED
J
50
J18
J17
J34
J33
100 - 120VAC
4A 50-60Hz
220 - 240VAC
2A 50-60Hz
J2
J1
Slot B Slot A
Power
supply
section
076R155-000
Issue 7
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