
Page 618 of 906
NT8D14 Universal Trunk card
553-3001-211 Standard 3.00 August 2005
Jumper strap settings
For most applications, the jumper strap settings remain set to the standard
configuration as shipped from the factory. See Table 190 on
page 616
.
The jumper strap settings must be changed, as shown in Table 191 on
page 617
, for the following:
•
For CO/FX/WATS or TIE trunk loops exceeding 1524 meters (5000 ft.)
Table 192
Trunk types – termination impedance and balance network (NT8D14BA, NT8D14BB)
Trunk types
Terminating
impedance
(Note 1)
Balance network for loop lengths (Note 2)
0–915 m
(0–3000 ft)
915–1524 m
(3000–5000 ft)
> 1524 m
(> 5000 ft)
CO/FX/WATS
600 or 900
ohms
600 ohms
3COM
3CM2
2-way TIE (LDR)
600 or 900
ohms
600 ohms
3COM
3CM2
2-way TIE (OAID)
600 or 900
ohms
600 ohms
3COM
3CM2
DID (loop length
< 600 ohms)
600 or 900
ohms
600 ohms
3COM
3CM2
DID (loop length
Š 600 ohms)
600 or 900
ohms
600 ohms
N/A
3CM2
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 jumper selectable between 3COM and 3CM2. Jumper selection for
3COM/3CM2 restriction does not apply to NT8D14BB.
Содержание Circuit Card
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Страница 4: ...Page 4 of 906 Revision history 553 3001 211 Standard 3 00 August 2005...
Страница 18: ...Page 18 of 906 Contents 553 3001 211 Standard 3 00 August 2005...
Страница 78: ...Page 78 of 906 Overview 553 3001 211 Standard 3 00 August 2005...
Страница 100: ...Page 100 of 906 Acceptance tests 553 3001 211 Standard 3 00 August 2005...
Страница 156: ...Page 156 of 906 Option settings 553 3001 211 Standard 3 00 August 2005...
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Страница 734: ...Page 734 of 906 NTAK10 2 0 Mb DTI card 553 3001 211 Standard 3 00 August 2005...
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Страница 768: ...Page 768 of 906 NTAK93 D channel Handler Interface daughterboard 553 3001 211 Standard 3 00 August 2005...
Страница 772: ...Page 772 of 906 NTBK22 MISP card 553 3001 211 Standard 3 00 August 2005...
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Страница 906: ...Page 906 of 906 Appendix A LAPB Data Link Control protocol 553 3001 211 Standard 3 00 August 2005...
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