Specifications

Page 2–12
FOCUS System Manual
Direct Transfer Trip option on the same DS0
channel. The HCB module has two types of rear
interface modules: the HCB-2T for two-terminal
applications and the HCB-3T for three-terminal
applications. The two-terminal rear interface
module has an eight-point compression type
terminal block; the three-terminal rear interface
module, which attaches to two adjacent HCB
modules, has two eight-point compression type
terminal blocks.
The PBT-a for a-law, PBT-u for u-law modules,
installed at the node nearest your company PBX,
provide an addressable connection between any
station (with a PBW module) on your FOCUS
network and your PBX. The PBT rear interface
module has an RJ-9 telephone jack and an 8-point
compression type terminal block.
The PBW module provides an addressable two-
wire telephone extension at any station on a
FOCUS network. The PBW rear interface module
has an RJ-9 telephone jack and an eight-point
compression type terminal block.
The PLD module provides multi-drop RS-232
data for SCADA applications and supports
internal and external addressing. The rear
interface module has a DB-9 female connector.
Each PRI module can support four independent
functions per module with common Guard and
Block outputs. All relay outputs are one amp form
A contacts. You can use the PRI module for POTT,
PUTT, Unblocking and DTT schemes. You can
also use the module for secure contact status
transfer.Specify input keying levels for inputs.
(All must be the same).
PRI-A-48 48/60V keying
PRI-A-125 110/125V keying
PRI-A-250 220/250V keying
PRI-M-48 48/60V keying, multi-drop
PRI-M-125 110/125V keying multi-drop
PRI-M-250 220/250V keying, multi-drop
The PRS module is functionally the same as the
PRI module except that it uses solid state contact
outputs. It also uses the same rear interface
module. Specify input keying levels for inputs.
(All four must be the same).
PRS-A-48 48/60V keying
PRS-A-125 110/125V keying
PRS-A-250 220/250V keying
PRS-M-48 48/60V keying, multi-drop
PRS-M-125 110/125V keying, multi-drop
PRS-M-250 220/250V keying, multi-drop
The SPD module is the same main module as the
HCB module. Like the HCB module, the SPD has
two types of rear interface modules: the SPD-2T
for two-terminal applications and the SPD-3T for
three-terminal applications. The two-terminal rear
interface module for the SPD is the same as the
two-terminal rear interface module for the HCB,
except that the SPD version has a 4/1 matching
transformer mounted on it. Likewise, the SPD’s
three- terminal rear interface module is the same
as the HCB’s three-terminal rear interface module,
except that the SPD version has a 4/1 matching
transformer mounted on it.
Three versions of the SRD Module are currently
available. The SRD-2 Module provides two RS-
232 data circuits per DS0, and the SRD-4 Module
one RS-232 and one RS-485 circuit per DS0. The
SRD-4N is similar to the SRD-4 except it includes
Sub-Rate Data Module
SRD
Pilot Wire Interface Module
for the SPD relay
SPD-2T
SPD-3T
Protective Relay Interface
Module
PRS
Protective Relay Interface
PRI
Party Line Data Module
PLD
Addressable two-wire voice
originating
PBW
Addressable two-wire voice
terminating
PBT