Mta Relays; Metallic Test Access Tb6 On Hms-358 Backplane - ADC HiGain H2TU-C-319 List 4E User Manual

LTPH-UM-1049-02, Issue 2
Metallic Test Access.
are under control of the two relays, K1 and K2. The S2 metallic test access ports (IN or OUT) are bused to terminal
block TB6 located on the HMS-358 backplane, as shown in
TB6 on the HMS-358 backplane.
Test
center
Both relays are energized or pulled down when the user either activates the MTA option from the front panel (or
the test menu) or upon command from the HMU. K1 opens the HDSL2 cable pair between the H2TU-Cs
transceiver and the incoming span and connects the latter to the Metallic Test Access Facilities (MTAF) OUT
T and R pins on TB6. K2 connects the HDSL2 transceiver to the Metallic Test Access Equipment (MTAE) IN
T and R pins on TB6. Typical MTAF and MTAE test interfaces are shown in
set connected to the out port of TB6 can be used to perform cable tests on the 2 wire HDSL2 cable pairs out to the
remote H2TU-R. Alternately, the OUT port of TB6 can connect to a golden H2TU-C which, in conjunction with
a T1 test set, can be used to perform system tests on the original circuit minus its H2TU-C and thus isolate any
trouble to the equipment or the facilities.
H2TU-C-319 List 4E
Figure 9 on page 28 shows the block diagram of the metallic test access features which
HMS-358
Backplane
AUX DSX-1
DACS
TB6
R
OUT
T
MUX
MUX DSX-1
TB6
R
Backplane
Jumpers IN
T
Figure 10. MTA Relays
DSX-1
TEST ACCESS
T
CRT AUD
TX
CRT VIS
RX
TB3
MAJ AUD
MAJ VIS
MIN AUD
BITS TIMING
TIP
A+
MIN VIS
SYS ID
B+
TB2 TB4
Figure 11. Metallic Test Access TB6 on HMS-358 Backplane
January 9, 2002
Figure 10 below.
HMS-358 Shelf
Defective H2TU-L
S1
S3
9
S2 K
13
MTAF
K1-D
31
Standby H2TU-L
S3
S3
14
MTAE
32
K2-S
TEST ACCESS
1 2
R
COM
RING
A-
TB5
B-
Figure 11 displays the location of
H
H
2
S
D
P T
S
A U
L
N
2
R
No connection
METALLIC
T R
OUT
IN
TB6
FAN
NO
TB7
Figure 9 on page 28. A cable test
Provisioning
29