TxPORT Transport PRISM 3021, Manual

Page: 13 / 47

Installation 2-5 PRISM 3021
C
ONFIGURATION
S
WITCH
S4
DTE R
ATE
Positions S4-1 through S4-5 select the DTE rate as shown in
Table 2-N. The DTE rate multipliers (N
×
56 and N
×
64) are deter-
mined by setting switch S3-7 (see Table 2-K on page 2-4).
Jumpers
To configure E1 network impedance, remove the E1-DTE
card as shown in Figure 2 -6 and place the jumpers as
explained in the following paragraphs.
E1 N
ETWORK
I
MPEDANCE
The network termination of the 3021 can be selected for
either 75 or 120 ohms. Placing the jumpers for J5 and J12 in
the center post and the post labeled 120 configures the unit
for 120-ohm termination. Placing the jumpers for J5 and J12
in the center post and the post labeled 75 configures the unit
for 75-ohm termination.
S
TATION
C
LOCK
S
IGNAL
L
EVELS
The 3021 accepts an RS-423-compatible station clock input.
Contacts are provided on the rear of the 1051 chassis (12-
slot chassis) to permit connection to an external timing
Table 2-N DTE Rate
DTE
Rate N
×
56
(kbps)
N
×
64
(kbps)
S4-1 S4-2 S4-3 S4-4 S4-5
N=31
1, 2
1736 1984 Down Down Down Down Down
N=30
1
1680 1920 Up Down Down Down Down
N=29
1
1624 1856 Down Up Down Down Down
N=28
1
1568 1792 Up Up Down Down Down
N=27
1
1512 1728 Down Down Up Down Down
N=26
1
1456 1664 Up Down Up Down Down
N=25
1
1400 1600 Down Up Up Down Down
N=24
1
1344 1536 Up Up Up Down Down
N=23
1
1288 1472 Down Down Down Up Down
N=22
1
1232 1408 Up Down Down Up Down
N=21
1
1176 1344 Down Up Down Up Down
N=20
1
1120 1280 Up Up Down Up Down
N=19
1
1064 1216 Down Down Up Up Down
N=18
1
1008 1152 Up Down Up Up Down
N=17
1
952 1088 Down Up Up Up Down
N=16
1
896 1024 Up Up Up Up Down
N=15 840 960 Down Down Down Down Up
N=14 784 896 Up Down Down Down Up
N=13 728 832 Down Up Down Down Up
N=12 672 768 Up Up Down Down Up
N=11 616 704 Down Down Up Down Up
N=10 560 640 Up Down Up Down Up
N=9 504 576 Down Up Up Down Up
N=8 448 512 Up Up Up Down Up
N=7 392 448 Down Down Down Up Up
N=6 336 384 Up Down Down Up Up
N=5 280 320 Down Up Down Up Up
N=4 224 256 Up Up Down Up Up
N=3 168 192 Down Down Up Up Up
N=2 112 128 Up Down Up Up Up
N=1 56 64 Down Up Up Up Up
1
This selection is not valid if the Channel Assignment is set to
Alternating.
2
This selection is not valid for CAS mode.
T1
T2
J14
J15
J16
J17
J5
J12
J13
F
ro
n
t
E1-DTE
Option Card
U6
U5
T1
T2
3021
Figure 2-6 Jumper Placement on the 3021
75
120
75
120
J6