CHAPTER 4 : GENERAL INFORMATION AND FEATURES
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Appendix III: G.703 64Kbps Co-directional Interface Application
P
C
M
P
C
M
E1
Tx
Tx
Rx
Rx
G.703
G.703
2WLL
2WLL
V.35
V.35
NT
Loopback Clock
only
NT
Loopback Clock
only
LT
External Clock
LT
External Clock
Fig.1 System Diagram
1
8
1 N/A
2 N/A
3 Rx
(Black)
4 Tx
(Red)
5 Tx
(Green)
6 Rx
(Yellow)
7 N/A
8 N/A
15 Rx
(Black)
17 Tx
(Red)
09 Tx
(Green)
12 Rx
(Yellow)
Fig.2 DB-25 to RJ-45 adapter for G.703
Power
Module
Front Panel
G.703
Module
JP1
Short:128K
Open: 64K
J15
U9
U11
MC145572
FB5
Fig.3 DT-128 mother PCB layout
1.
G.703 interface support maximum length
from LT to PCM site:
500m on 26 AWG
600m on 24 AWG
2.
Internal G.703 module configuration :
JP1
Short
Æ
for 128Kbps (Proprietary)
JP1
Open
Æ
for 64Kbps (G.703
Codirectional)
3.
Internal G.703 module configuration :
J15 Short Right
Æ
for G.703 module
J15 Short Left
Æ
for RS-232, V.35 and
RS-530
4.
From DT-128 PCB version V4.3 and
Firmware version V3.x on, the 2W/4W
selection switches have already replaced
by firmware program selection. User can
do operate from menu-tree "CONFIG
NTU
Æ
Line Type
Æ
" to select "2W",
"4W" or "4W Att16dB" for suitable
leased line connection.
5.
The firmware version before V3.0 is used
for PCB version before V4.3. And the
firmware version after V3.0 is used for
PCB version after V4.3. Do not use the
firmware version after V3.0 onto PCB
version before V4.3, neither use the
firmware version before V3.0 onto the
PCB version after V4.3.
Summary of Contents for DT-128 Series
Page 2: ......
