Verilink PRISM 3111 (34-00242) Product Manual - Manual (Page 25)

DIP Switch Settings 17
port bit rates that are multiples of 56 kbps. The unit maintains ones density for the
selected DS0 channels in this mode.
Data Port 2
Switch S1-8 sets the multiplier for Data Port 2 on the 3112 only. The unit can
operate at any data rate that is a multiple of 56 or 64 kbps. Selecting N x64K (Dn)
provides port bit rates that are multiples of 64 kbps. The ones density requirements
of the T1 network line must be ensured in this mode. Refer to the front panel Rate
selection option on page 34 for more information. Selecting Nx 56K (Up) allows
port bit rates that are multiples of 56 kbps. The unit maintains ones density for the
selected DS0 channels in this mode.
Switch S2 Switch S2 (Figure 2-5) configures parameters for Network Framing, Network
Coding, Network LBO, Timing Source, Test Button Loop Code, and Test Button
Mode.
Figure 2-5 Switch S2
Network Framing
Switch S2-1 matches the unit to the network line framing as either ESF (Dn) or
D4 (Up).
Network Coding
Switch S2-2 sets the network line coding to either B8ZS (Dn) or AMI (Up).
Network LBO
Switch S2-3 and S2 -4 set the line build out signal level of the transmit data
(TXD) from the unit to the network. The telephone company can provide the
proper setting.
If unsure of the exact setting, leave it at the default value.
Table 2-10 lists the available levels.
Table 2-10 Network LBO
S2-3 S2-4 Network LBO
Dn Dn 0 dB
Up Dn -7.5 dB
Dn Up -15.0 dB
Up Up -22.5 dB
7 6 5 4 3 2 1
D
n
U
p
8
N
et
w
o
rk
N
et
w
o
rk
N
et
w
o
rk
T
es
t
B
u
tt
o
n
T
es
t
B
u
tt
o
n
F
ra
m
in
g
C
o
d
in
g
M
o
d
e
L
o
o
p
C
o
d
e
T
im
in
g
S
o
u
rc
e
L
B
O
N
et
w
o
rk
L
B
O
T
im
in
g
S
o
u
rc
e