Telephone Equipment and Service

The RDSU in its basic configuration has two standard telephone circuits and four digital telephone circuits (cordless as well as corded). The standard telephone circuits can support the same devices that the RSTU2 can, with the exception of standard telephone message waiting lamps. The digital circuits can support the same devices as the PDKU, except for the DDSS console. The RDSU can be equipped with an RSTS subassembly to provide two more standard telephone circuits, and an R48S subassembly to increase the standard telephone maximum loop length.
© DK40i – a K5RCU or K5RCU2 must be installed in the Base KSU to interpret DTMF tones transmitted by devices connected to the standard telephone circuits.
© DK424 – an RRCS must be installed on the common control unit to interpret the DTMF signals for devices connected to the standard telephone circuits.

The RSTU2 has eight circuits that can support single-line devices (one device per RSTU2 port). Besides rotary and DTMF standard telephones, the RSTU2 can support the Strata AirLink Wireless analog system, fax machines, dictation equipment, modems, a separate BGM source, off-premises stations, Toshiba Stratagy and VP voice mail systems, and digital announcement devices for optional built-in AA or ACD.

This PCB also supports the Message Waiting feature on standard telephones that are equipped with a 90VDC neon message waiting lamp.

The RSTU2 also provides an 80V RMS sine wave ring generator and has interface connectors for an optional R48S subassembly that increases the maximum possible station loop length from 600 to 1200 ohms.

© DK40i – a K5RCU or K5RCU2 must be installed in the Base KSU to interpret DTMF tones transmitted by devices connected to the standard telephone circuits.

© DK424 – an RRCS must be installed on the common control unit to interpret the DTMF signals for devices connected to the standard telephone circuits.

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.

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.

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.

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.

The RCIU2 comes equipped with four Caller ID circuits; an RCIS subassembly PCB can be installed onto the RCIU2 to provide four additional Caller ID circuits. Hence, an installed RCIU2/ RCIS can provide a maximum of eight Caller ID circuits per cabinet slot. Built-in gas tubes help protect each RCIU2/RCIS circuit from lightning surges.

The RCIU2 is required, along with an analog ground/loop start CO line PCB, to provide the Caller ID feature. Caller ID is also known as CLID and is available at extra cost per line from the local Telco. It is sometimes known as a CLASS feature. Each RCIU2 circuit receives and decodes telephone number and name information sent from the calling CO. Caller ID is available on analog loop start lines and analog ground start lines only. An RCIU2 circuit must be available with each RGLU2, RCOU/RCOS, PCOU or KCDU2 circuit that is to receive Caller ID. Built-in gas tubes help protect each RCIU2 circuit from lightning surges. An RCIS subassembly PCB can be installed onto the RCIU2 to provide four additional Caller ID circuits.

The optional R48S unit can be connected to the RSTU2 or RDSU, and, by creating 48V loop voltage instead of 24V, can extend the maximum possible loop length of standard telephone circuits (including the resistance of the phone) from 600 ohms to 1200 ohms, allowing standard telephones to be connected farther from the system. By using this unit, a less expensive type of off-premises lines can be used

The RBSS attaches to the RBSU to provide two additional BRI S/T type circuits that can be used for station-side connections only. An RBSU with the RBSS subassembly provides four BRI circuits in one card slot. RBSU/RBSS stations can be voice and/or data devices, such as ISDN telephones and Terminal Adapters, that support the standard S-type interface. Each RBSU/RBSS circuit provides two B channels, plus one D channel and reduces the system’s basic capacity by two station ports and two CO lines. See “ISDN Basic Rate Interface (BRI)” on Page 73 for more information. Note RBSU/RBSS will be available with DK424 and DK40i Release 4.1.

The Basic Rate Interface (BRI) Unit provides two BRI S/T circuits. Each circuit provides two simultaneous voice and/or data connections with a single interface. BRI uses the 2B+D transmission format which is defined as two 64-kbps bearer channels and one 16-kbps data (control) channel. The D channel carries call setup control data. The RBSU BRI circuits can be connected to ISDN BRI network lines and/or ISDN S-type Terminal Equipment (TE-1) or Terminal Adapters (TA) on the station side. The RBSU/RBSS BRI circuits that are configured for the station side provide a passive bus that enables up to two TE1 and TA devices to be connected to one BRI circuit. When multiple TE1 and TA devices are installed on a singled RBSU/RBSS BRI circuit, the devices must share or contend for that circuit’s two B channels. A maximum of two simultaneous voice and/or data calls are allowed between all devices connected to the same BRI circuit. The contention rule for the two BRI B channels is first come, first serve. Network connections using BRI S/T type interface also require a dealer-supplied, UL-listed, external Network Terminal (NT-1) device. In Canada, the NT-1 must be CSA certified. Note RBSU/RBSS will be available with DK424 and DK40i Release 4.1.

The RBUS attaches to the RBUU to provide two additional BRI “U” circuits that can be used to connect to Network BRI lines and/or station-side connections only. An RBUU with the RBUS subassembly provides four BRI “U” circuits in one card slot. RBUU/RBUS stations can be voice and/or data devices, such as ISDN telephones and Terminal Adapters, that support the standard U-type interface. Each RBUU/RBUS circuit provides two B channels plus one D channel and reduces the basic system capacity by two CO lines and two station ports.

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.

The RSSU contains one RS-232 serial port for connecting an SMDI, SMIS processor, DKAdmin/ DKBackup PC or external modem. The RSSU provides a cost-effective alternative to the PIOU or PIOUS when only one other serial I/O port is needed, or when the other features of the PIOU or PIOUS are not required. The RSSU has a fixed speed of 1200 bps. It does not support SMDR, or the IMDU or RMDS modems.
© DK40i – one optional RSSU maintenance interface PCB can be used for connecting a maintenance PC or external modem (local or remote) to the DK40i.
© DK424 – a maximum of three RSSU cards can be supported per DK424.

The RSTS attaches to the RDSU and adds two standard telephone circuits to the PCB. With the RSTS installed, the RDSU provides four standard telephone circuits and four digital telephone circuits. (RSTS does not support standard telephone message waiting.)

The RWIU interfaces the DK40i and DK424 with the Strata AirLink Telephone wireless system. The card functions as a protocol converter between the Base Stations and the PBX. It has four digital circuits that connect to four Base Stations using industry standard RJ11 jacks. Roaming and handoff functionality are present between all four Base Stations.