British Telecom ESCORT, System Manual

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8. SPECIFICATION
Mains supply
Power consumption
Dimensions
Weight
Environment
Line conditions
Intercom circuit
Station ringing voltage
Exchange line loop
detector
Exchange line ringing
detector
Insertion loss
180-260v ac, 50Hz
30W max.
width 320rnrn, height 225mm, depth 85mm.
4kg
Normal operation -5 to 45°c, with max.
humidity 95% non-condensing.
Storage -20 to 60°c
Total de loop resistance between an y
terminal and the local exchange not to
exceed 1250 ohms, with a local battery
voltage of 45v to 52v.
Total de loop resistance between the
CCU and any termin al not to exceed 250
o hms. N o te t h a t t h i s l i m i t i s
overridden b y the approval conditions
of the individual telephones approved
for connection.
42 volt feed, max imum current limited
to 80mA.
The min imum o pen c i rc u it ring i n g
voltage available at the CCU i s 75v
peak to peak, with frequency between 17
and 25 Hz. The ring ing generator is
capable of ring ing all six extens ion
po rts simultaneously provided the REN
on each port does not exceed 2.0
An exchange line seiz ed condition is
detected when a lo op current gre ater
than 18m A is pres ent.
A rele a s e d
condition is detected when a current
less than 5 mA is present.
IC ringing will be detected if its
amplitude is greater than 35v pk-pk,
and frequency between 15 and 65 Hz .
The insertion loss between an exchange
line port and an extens ion po rt, when
connected vi a the CCU, is less than
0 .5 dB. T h i s a s s u m e s a 6 0 0 o hm
resistive termination at both ports.
E N
D
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