Nortel Networks Circuit Card - Manual (Page 122)

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553-3001-211 Standard 3.00 August 2005
2-way tie (OAID) 600 or 900
ohms 600 ohms 3COM1 3COM2
DID (loop < 600
ohms) 600 or 900
ohms 600 ohms 3COM1 3COM2
DID (loop Š 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
Table 34
NT8D14 vintages BA/BB trunk types—termination impedance and balance network
(Part 2 of 2)
Trunk types
Terminating
impedance
(Note 1)
Balance network for loop lengths (Note 2)
Zero–915 m
(zero–3000 ft)
915–1524 m
(3000–5000 ft)
> 1524 m
(> 5000 ft)
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.