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PLESSEY OFFICE SYSTEMS
CDSS 60/120 (Single & Double Cabinet Systems)
Single Cabinet System
 The
CDSS60/120 (Single Cabinet) is a digital switching system manufactured by Plessey. It offers the full range of facilities and management controls available to the CDSS family, and provides for the connection of up to 64 extensions, 16 trunks (12 of which may be Public Exchange trunks) and one operator's console.
The system employs time-division multiplex (TDM) techniques for switching, pulse code modulation (PCM) for speech and signalling, and modern microprocessor technology for fast, reliable control. Traffic-handling capability is greater than 0.21 erlang per extension.
The equipment is modular, highly standardized and uses plug-in design techniques to facilitate installation and maintenance. The compact metal equipment cabinet is finished in textured stove enamel, and a 'smoked' polycarbonate door can be provided as an optional extra.
The desk-top operator's console is a mirror-finish polycarbonate moulding incorporating
touch sensitive keys for ease of operation, with light emitting diodes ( LEDS) and a liquid-crystal display (LCD) unit for comprehensive information display.
Extension telephones can be conventional press button ME instruments, or rotary dial type but with reduced feature access.
 General specification
Technology
Microprocessor control
Solid-state TDM switching
PCM Transmission
Capacity
Extensions: 64 (max) in incremental steps of 8
Exchange trunks: 12 (max) in incremental steps of 4
Telephones
Press button: CCITT recommended MF4
Rotary-dial: l0p/s. 2:1 break/make ratio
Extension lines
Wiring: 2-wire + local earth connection
Loop resistance: 1350 ohms (max), inc telephone
Insulation resistance: 50k ohms (mm)
Line voltage: 50V
Line current: 25-35mA (constant current feed)
Ringing: 75V RMS, 25Hz
Conference
4 extensions, or 3 extensions + 1 trunk (Exchange or Private wire)
4 simultaneous conferences (max)
Extension hunting groups
8 (typically), 15 extensions per group
Extension pick-up groups
8 (typically) 15 extensions per group
Exchange lines
Loop resistance: 1200 ohms (max)
Insulation resistance: 50k ohms (mm)
Signalling: Earth or loop calling
Route barring
8 categories
Short codes
System: 20 codes (max)
Power fail extensions
25% of trunks
Operator's console
Desk top, 1 (max)
Height: 130mm
Width: 470mm
Depth: 250mm
Weight: 7kg
Keys: Touch sensitive
Visual display: LEDs and alphameric LCD characters
Cabling distance: 1 km
Equipment cabinet
Height: 280mm
Width: 810mm
Depth: 470mm
Weight: 15kg (fully equipped)
System
Non-blocking switch
16 simultaneous conversations
Traffic: 0.21 erlang/extension (approx)
Interface: V24 @ 300, 1200 or 4800 baud for Maintenance Teletype
Interface: V24 @ 300, 1200 or 4800 baud for Call Information Logger
Transmission bandwidth: 300-3400Hz
Power
Input: 230V ' 10% or 115V ' 10%, 50-60Hz, or alternatively -50V DC, nominal.
Environmental limits
Ambient temperature: 35:C long term and 0 - 45 C short term
Relative Humidity: 20 - 80% long term and up to 90% short term
Double Cabinet System
 The
CDSS60/120 (Double Cabinet) is a digital switching System manufactured by Plessey. It offers the full range of facilities and management controls available to the CDSS family, and provides for the connection of up to 120 extensions 32 trunks (28 of which may be Public Exchange trunks) and two operator's consoles
The system employs time-division multiplex (TDM) techniques for switching pulse code modulation (PCM) for speech and signalling, and modern microprocessor technology for fast, reliable control. Traffic-handling capability is greater than 0.21 erlang per extension.
The equipment is modular, highly standardized and uses plug-in design techniques to facilitate installation and maintenance. The compact metal equipment cabinet is finished
in textured stove enamel, and a 'smoked' polycarbonate door can be provided as an optional extra.
The desk-top operator's console is a mirror-finish polycarbonate moulding incorporating
touch sensitive keys for ease of operation with light emitting diodes (LEDs) and a liquid.cryst8l display (LCD) unit for comprehensive information display.
Extension telephones can be conventional press button MF instruments, or rotary dial type but with reduced feature access.
General Specification
Technology
Microprocessor control
Solid-state TDM switching
PCM transmission
Capacity
Extensions: 120 (max) in incremental steps of 8 Trunks: 32 (max) within overall limit of up to 28 exchange
trunks (in incremental steps of 4) and up to 12 inter-PBX trunks
Telephones
Press button: CCITT recommended MF4
Rotary-dial: lop/s 2:1 break/make ratio
Extension lines
Wiring: 2-wire + local earth connection
Loop resistance: 1350 ohms (max), inc telephone
Insulation resistance: 50k ohms (mm)
Line voltage: 50V
Line current: 25-35 mA (constant current feed)
Ringing: 75V, RMS 25Hz
Conference
4 extensions, or
3 extensions + 1 Trunk (Exchange or Private Wire)
4 simultaneous conferences (max)
Extension hunting groups
8 (typically) 15 extensions per group Extension pick-up groups
8 (typically) 15 extensions per group
Exchange lines
Loop resistance: 1200 ohms (max)
Insulation resistance: 50k ohms (mm)
Signalling: Earth or loop calling
Route barring
8 categories
Inter- PBX lines
Loop-disconnect
SSAC1 3
SSAC1 5
SSDC5
SSDC10
Short codes
System: 20 codes (max)
Power fail extensions
25% of trunks
Operator's console
Desk top, 2 (max)
Height: 1 30mm
Width: 470mm
Depth: 250mm
Weight: 7kg
Keys: Touch sensitive
Visual display: LEDs and alphameric LCD characters
Cabling distance: 1 km
Equipment cabinet
Height: 560mm
Width: 810mm
Depth: 470mm
Weight: 30kg (fully equipped)
System
32 simultaneous conversations
Traffic: 0.21 erlang/extension (approx)
Interface: V24 c~ 300, 1200 or 4800 baud (2 off for CIL and Maintenance Teletypes).
Transmission bandwidth: 300-3400Hz
Power
Input: 230V' 10% or 1l5V' 10%, 50-60Hz, or alternatively -50V DC, nominal
Environmental limits
Ambient temperature: 5' - 35'C long term and 0' - 45'C short term
Relative humidity: 20 - 80% long term and up to 90% short term (non-condensing)
Taken from Plessey Publication No. P8304/1 & P8304/3 1983
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PLESSEY