Primary Rate Interface equipment: overview
Page 25 of 188
ISDN PRI Installation
Use the same SW2 settings in the table below for transmission equalization
with QPC720 in Primary Rate Interface (PRI) mode or Digital Trunk
Interface (DTI) mode.
Table 4
Transmission equalization switch settings for QPC720 PRI/DTI mode
Switch S2 settings
To repeated facility
To cross-connect point
5 on
2, 4, 6 on
1, 3, 7 on
0–45 m
(0–150 ft)
46–135 m
(151–450 ft)
136–225 m
(451–750 ft)
0–30 m
(0–100 ft)
31–100 m
(101–355 ft)
101–200 m
(356–655 ft)
Switch 3 option for DTI with ESF
SW3–1
on = extended superframe format (ESP)
off = superframe format (SF)
Note 1:
All positions on S2 (location B22) are OFF except as shown under the column labeled “Switch S2
settings.”
Note 2:
The switch 3 option for DTI with ESF applies to only X11 release 16, 17, and 18. All other positions
on the 8-pole SW3 (location E37) should be OFF.
Note 3:
Prior to X11 release 19 (releases 16, 17, and 18), you must set the framing format as ESF with the
DLOP prompt in LD 17 before you set SW3–1 on the card for the DTI with ESF option.
Note 4:
Beginning with X11 release 19, framing format, line encoding, and method of yellow alarm are
selectable for both DTI and PRI in LD 17 with the DLOP, LCMT, and YALM prompts. All SW3 switch
positions should be OFF.
