Nortel Networks 1000 - Manual (Page 92)

92 Option settings
Table 31
NT8D14 vintages BA/BB trunk types-termination impedance and balance network (cont’d.)
Balance network for loop lengths (Note 2)
Trunk types
Terminating
impedance
(Note 1)
Zero–915 m
(zero–3000 ft)
915–1524 m
(3000–5000 ft)
> 1524 m
(> 5000 ft)
DID (loop ˇ S 600
ohms)
600 or 900 ohms 600 ohms N/A 3COM2
RAN: continuous
operation mode 600 or 900 ohms 600 or 900 ohms N/A N/A
Paging 600 ohms 600 ohms N/A N/A
Note 1: The terminating impedance of each trunk unit is software selectable in LD 14 and should
match the nominal impedance of the connecting equipment.
Note 2: The balance network of each trunk unit is software selectable between resistive 600 or 900
ohms or 3COM and is jumper selectable between 3COM1 and 3COM2.
Table 32
NT8D14 vintages BA/BB cable loop resistance and loss
Cable loop resistance (ohms)
Cable loop loss (dB)
(non-loaded at 1kHz)
Cable length 22 AWG 24 AWG 26 AWG 22 AWG 24 AWG 26 AWG
915 m (3000 ft) 97 155 251 0.9 1.2 1.5
1524 m (5000 ft) 162 260 417 1.6 2.0 2.5
2225 m (7300 ft) 236 378 609 2.3 3.0 3.7
3566 m (11700 ft) 379 607 977 3.7 4.8 6.0
5639 m (18500 ft) 600 960 1544 5.9 7.6 9.4
NT8D15 E and M Trunk card
Table 33
NT8D15 E and M Trunk card
Mode of operation (Note 2)
2-wire trunk 4-wire trunk
DX tip & ring pair
Jumper
(Note 1)
Type I Paging Type I Type II
M—rcv
M—xmt E—rcv
M—xmt
J1.X off off off off Pins 1–2 Pins 2–3
J2.X on on
(Note 3) on on off off
J3.X off off off off (Note 4) (Note 4)
J4.X off off off off Pins 2–3 Pins 1–2
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.