Verilink PRISM 3001 (34-00186) Product Manual - Manual (Page 22)

2-8 I NSTALLATION
20 out of the 24 possible bit rate configurations are available through these
hardware settings. The missing rates are N
×
56 and N
×
64, where N = 15, 17, 21,
and 23. All 24 rate configurations can be programmed through software control by
using the NMS or supervisory ports. The terminal interface program also allows
the high-speed port to be mapped to a block of DS0s that begins at a user-
selectable starting channel.
For units equipped with the T1 DTE port option, channel numbers beyond those assigned
to the high-speed port are automatically mapped through to the T1 DTE. In the alternate
channel mode, every data channel is followed by an idle channel assignment. Therefore,
the even channels are quiet and are not available to the T1 DTE port.
T1 DTE
Switch S8
The optional T1 DTE port circuit board allows for drop and insert applications.
DIP Switch S8 is located on this board which is on the opposite side of the unit
from the main circuit board).
T1 DTE Line Framing
Position S8-1 is used to set the framing of the T1 DTE line.
Down: ESF Up: D4
T1 DTE Line Coding
Position S8-2 sets the line coding for either AMI or B8ZS zero suppression.
Down: AMI Up: B8ZS
T1 DTE LBO
Positions S8 -3, S8-4, and S8 -5 set the line build out to one of the values listed
below. The transmit output level is selectable according to the cable length
between the unit and the T1 equipment (PABX, channel bank, etc.). The factory
default setting is 0 -110 feet.
Table 2-7 T1 DTE Line Build Out
S8-3 S8-4 S8-5 DTE LBO
Down Down Down 0 -110 ft
Up Down Down 110-220 ft
Down Up Down 220-330 ft
Up Up Down 330-440 ft
Down Down Up 440-550 ft
Up Down Up 550-655 ft
Down Up Up > 655 ft
7 6 5 4 3 2 1
Dn
Up
8
DT
E
DT
E
Co
d
in
g
LB
O
DT
E
Fr
am
in
g
DT
E
LB
O
DT
E
LB
O
Not Used Not Used Not Used
Figure 2-5 Switch S8