Nortel Networks 1000 - Manual (Page 596)

596 NT8D14 Universal Trunk card
Table 209
NT8D14 Universal trunk card - trunk interface electrical characteristics (cont’d.)
Characteristic
CO/FX/WATS
trunks DID or tie
trunks RAN
trunks Paging
trunks
DC signaling loop length
(max) 1700-ohms loop with
near-end battery of
–42.75 V 2450-ohms loop with
near-end battery of
–44 V 600/
900-ohms
loop 600 ohms
loop
Far-end battery –42 to –52.5 V (Note
4) –42 to –52.5 V –42 to
–52 V N/A
Minimum detected loop
current 20 mA 10 mA 10 mA N/A
Ground potential
difference ±3 V ±1 V ±1 V
Low DC loop resistance
during outpulsing <300 ohms N/A N/A N/A
High DC loop resistance Ground start
ˇ
S 30k ohms;
loop start
ˇ S 5M ohms
N/A N/A N/A
Ring detection 17 to 33 Hz
40 to 120 V rms N/A N/A N/A
Line leakage ˇ
S 30k ohms, tip-to-ring,
tip-to-ground, ring-to-ground
N/A N/A
AC induction rejection 10 V rms, tip-to-ring,
tip-to-ground, ring-to-ground N/A N/A
Note 1: Selected in software.
Note 2: Selected by jumper strap settings on card. Refer to Table 229 "Jumper strap settings
- factory standard (NT8D14BA, NT8D14BB)" (page 614) , Table 230 "Jumper strap settings -
extended range (NT8D14BA, NT8D14BB, NT8D14BB Release 10 and up)" (page 615) , and Table
231 "Trunk types - termination impedance and balance network (NT8D14BA, NT8D14BB)" (page
615)
for details.
Note 3: Loop start answer supervision introduced with vintage BA cards and Release 19 software.
Note 4: For loop extender application, the maximum voltage applied between tip and ring is –105 V
±5%. The minimum DC loop resistance for this type of application is 1800 ohms.
Electrical characteristics of the Universal Trunk Card are listed in Table
210 "Universal Trunk Card electrical characteristics" (page 596) .
Table 210
Universal Trunk Card electrical characteristics
Characteristic DID trunk CO trunk
Terminal impedance 600 or 900 ohms (selected by
software) 600 or 900 ohms (selected by
software)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.