Nortel Networks 553-3001-211 manual Ons Ops, 3COM

Page 162 of 894 NT1R20 Off-Premise Station Analog Line card

See Software Input/Output: Administration (553-3001-311) for LD 10

service change instructions.

Table 62

OPS analog line card configuration

Application	On-premise station (ONS)					Off-premise station (OPS)
Class of service			ONS				OPS
Loop resistance		0 - 460 ohm					0 - 2300 ohm
Jumper strap	Both JX. 0 and JX 1 off				Both JX. 0 and JX.			Both JX. 0 and JX.
settingb						1 off			1 on
Loop loss dBc	0-1.5		>1.5-2.	>2.5-3.	0-1.5		>1.5-2.	>2.5-4.		>4.5-15
			5	0			5	5
TIMP	600		600	600	600		600	600		600
	ohm		ohm	ohm	ohm		ohm	ohm		ohm
BIMP	600		3COM	3CM2	600		3COM	3CM2		3CM2
	ohm				ohm
Gain treatment e				No						Yes

a. Configured in the Analog (500/2500-type) Telephone Administration program (LD 10).

b. Jumper strap settings JX 0 and JX. 1 apply to all eight units; “X” indicates the unit number, 0-7. “OFF” indicates that a jumper strap is not installed across both pins on a jumper block. Store unused straps on the OPS analog line card by installing them on a single jumper pin.

c. Loss of untreated (no gain devices) metallic line facility. Upper loss limits correspond to loop resistance ranges for 26 AWG wire.

d. Default software impedance settings are:

ONS CLSOPS CLS TIMP:600 ohm600 ohm BIMP:600 ohm3COM2

e. Gain treatment, such as a voice frequency repeater (VFR) is required to limit the actual OPS loop loss to 4.5 dB, maximum. VFR treatment of metallic loops having untreated loss greater than 15dB (equivalent to a maximum signaling range of 2300 ohm on 26 AWG wire) is not recommended.

553-3001-211 Standard 2.00 September 2004