Comtest Networks MTAS-192 METALLIC TEST ACCESS SYSTEM - Manual (Page 16)

Comtest Networks CT-IG-MTAS192-2008-v1_8.doc
MTAS-192
10 Installation Guide June 2006
Each splitter card has five (5) modes, which are explained below.
Table 6: Splitter Card Modes
Mode Description TL1 Command
1
Transparent/
Isolated In this mode, all test connections are
released. This is the default mode.
DISC-TACC
Loop-around
In this mode, the AF and AE sides of a
TAP are looped back at the line card.
CONN-LPACC-MET
High-impedance
Monitor
This mode uses the AF portion of the TAP
bus and performs a hitless connection to
provide access for monitoring.
CONN-TACC-MET
Bridged Monitor
This mode connects the AF pair directly to
the circuit under test.
CONN-MON
Split
Split Mode access breaks the cable pair to
be tested in two directions, one provided
by AF (towards the customer) and AE
(towards the equipment).
CHG-SPLIT
Figure 10: Transparent/Isolation Mode
1
TL1 commands are explained in the MTAS-192 User Guide.
Facility Side (F)
(Downstream)
AF
Equipment Side (E)
(Upstream)
AE
PSTN
Class 5
DSLAM
Splitter
MTAU (MTAS-192)
Tip Tip
Ring Ring
T T R R
2–Wire Circuit
Access Point
RTU (Test Head)