Loop Start Co Line Interface Unit (Rcou); Ground/Loop Start Interface Co Line Interface Unit (Rglu2); Direct Inward Dialing Interface Unit (Rddu); Tie Line Unit (Remu) - Toshiba Strata DK14 General Description Manual

Universal Slot PCBs
CO Line PCBs

Loop Start CO Line Interface Unit (RCOU)

The RCOU in its basic configuration has four analog loop start CO line circuits, connecting to the
public telephone network.
Each RCOU line can be programmed for DTMF or Dial Pulse signaling and has a switch to control
potential excess volume that can be created by a nearby PBX or CO.
An optional RCOS subassembly can be attached to the RCOU for four more loop start lines. Each
line can be programmed for DTMF or Dial Pulse signaling. Built-in gas tubes help protect each
circuit from lightning.
Loop Start CO Line Interface Subassembly (RCOS)
The RCOS can be attached to the RCOU to provide four additional analog loop start CO line
circuits. Each RCOS line has all of the features that are available with the RCOU lines.

Ground/Loop Start Interface CO Line Interface Unit (RGLU2)

The RGLU2 provides four analog CO line circuits which can be configured individually for
ground start or loop start. Ground start should be used for applications requiring disconnect
supervision, such as AA/Voice Mail, or ACD.
The RGLU2 also provides ring detection, dial outpulsing, Hold, and CO line flash signal. Each
RGLU2 line can be programmed for DTMF or Dial Pulse signaling and has a switch to control
potential excess volume that can be created by a nearby PBX or CO. Built-in gas tubes help protect
each circuit from lightning.

Direct Inward Dialing Interface Unit (RDDU)

The RDDU provides four analog DID lines, each of which is assigned a single office code along
with a block of extension numbers. Each extension number is programmed to ring a [DN] selected
in system programming. This enables calls over the same line to be routed to different stations.
Each DID line can be set for either Wink Start or Immediate Start. DID lines can also support
DNIS and/or ANI. An optional K5RCU or K5RCU2 (DK40i) or RRCS (DK424) tone receiver
PCB is required for DTMF DID operation. Rotary DID signaling ability at 20 pps is a standard
feature. An external protector is required for each line.

Tie Line Unit (REMU)

The REMU has four analog circuits for E & M Type I or Type II signaling, Immediate Start or
Wink Start Tie lines. A choice between 2- or 4-wire transmission is available as a jumper-plug
option.
Tie lines can also support DNIS and/or ANI. An optional K5RCU or K5RCU2 (DK40i) or RRCS
(DK424) tone receiver PCB is required for DTMF Tie operation. An external protector is required
for each line. REMU Tie lines are two-way and can be used for incoming and outgoing calls.

T1/DS-1 Interface Unit (RDTU2) (DK424 only)

The RDTU provides either 8, 16 or 24 digital voice channels that can be individually configured
for ground start CO line operation, loop start CO line operation, DID/DOD line operation (with
hookflash) or Tie line operation. The number and type of channels for each RDTU installed is
assigned in system programming. All RDTU line types are two-way and can be used for incoming
and outgoing calls.
Any RDTU, DID/DOD, or Tie channel can be configured in system programming to receive DNIS
and/or ANI information from long distance carriers.
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