Installation and Setup
2-2
SpectraComm 553 Fractional T1 DSU
076R155-000
Installation and Operation Manual
Issue 7
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
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.
Figure 2-1
SpectraComm 5000 Shelf Back Panel
J51: 40-pin signal
J50: Shelf address
J49: 50-pin power
Slot B Slot A
Power
J52: 30-pin signal
Zone 1
Zone 2
Zone 3
16-slot Zone 3 connector panel shown
bus connector
jumper
bus connector
supply
section
bus connector
with one DB25S connector (J1 to J16) per slot.
100 - 120VAC
4A 50-60Hz
220 - 240VAC
2A 50-60Hz
J
50
J51
J49
CAUTION HIGH VOLTAGE
DISCONNECT POWER
BEFORE SERVICING
THIS ENCLOSURE MAY CONTAIN FCC
REGISTERED EQUIPMENT. SPECIFIC
REGISTRATION INFORMATION IS
CONTAINED ON INDIVIDUAL UNITS
S/N
MODEL:
MS - 1
General DataComm, Inc.
Middlebury, CT
.
LISTED
J1
J2
J3
J5
J6
J7
J8
J9
J10
J11
J12
J13
J14
J15
J16
J32
J48
J52
THIS EQUIPMENT COMPLIES WITH THE REQUIREMENTS FOR A
CLASS A COMPUTING DEVICE IN FCC RULES PART 15 SUBPART J.
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-
J31
J47
J30
J46
J29
J45
J28
J44
J27
J43
J25
J42
J25
J41
J24
J40
J23
J39
J22
J38
J21
J37
J20
J36
J19
J35
J18
J34
J17
J33
DTE cable for SC553 DSU attaches to DB25
that corresponds to the slot containing the DSU.
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.