Toshiba Strata DK 280 Installation Manual page 277

Table 7-2
loop Requirements
,
Device
Max Loop Resistance Max Distance from
Number of
Description Interface PCB
(Including Device)
KSU to Device
Wire Pairs'
Digital
PDKU (ckts 1 - 8)
telephone
or
40 ohms 1000 ft. (303 m)
1 -pair
RDSU (ckts 5 - 8)
DDSS console PDKU (ckt 8)
40 ohms
1000 ft. (303 m)
1 -pair
Attendant
console
RATU-(ckts 1 - 4)
40 ohms
1000 ft. (303 m)
2-pair
RPCI-DI PDKU (ckts 1 - 8)
or or
PDIU-D12 RDSU (ckts 5 - 8)
40 ohms 1000 ft. (303 m)
Shares digital
telephone
wire-pair?
PDIU-DS
PDKU (ckts 1 - 8) or
RDSU (ckts 5 - 8)
40 ohms
1000 ft. (303 m),
1 -pair
ADM
PDKU (ckts 1 - 8) or
RDSU (ckts 5 - 8)
40 ohms 1000 ft. (303 m)
Shares digital
telephone
wire-pair.3
DDCB
PDKU or
RDSU (ckt 5)
40 ohms 1000 ft. (303 m)
1 -pair
HDCB
PEKU (ckt 5)
or
PESU2 (ckt 5)
40 ohms 1000 ft. (303 m) 2-pair
HDSS consoles PEKU (ckts 7 & 8)
Standard RSTU (ckts 1 - 8)
telephones, RDSWRSTS (ckts 1 - 4)
voice mail, PSTU (ckts 1 - 8)
auto attendant, or
etc.
PESU* (ckts 1 & 2)
20 ohms
l
300 ohms 4
l
600 ohms
l
1,200 ohms
500 ft. (152 m)
l
300 ohms, Approx.
3000 ft. (909 m)
l
600 ohms, Approx.
9000 ft. (2,727 m)
l
1200 ohms, Approx.
21,000 ft. (6,363 m)
(with 150 ohm device.
See manufacturer's
product specifications
for exact resistance of
device).
1 -pair
EKTs PEKU or PESU
40 ohms
1000 ft. (303 m)
2-pair
OCA Stations
need 3-pair.
RATI RATU (ckts 1 - 4)
40 ohms
1000 ft. (303 m)
1 or 2-pair
Notes:
DKOOOZ+C2
1. Use 24 A WG twisted pairs.
2. PESU circuits 3 and 4 are not used.
3. Two-pair wire or an optional telephone power supply is required to achieve maximum range.
4. 300 ohms for PSTU/PESU; 600 ohms for RSTU, RDSU/RSTS/RSTU2 without R48S option, and 1200 ohms for RSTU or
RDSU equipped with an optional R48S.
January 1996
7-3