ADC HiGain H2TU-C-319 List 4E User Manual page 39

LTPH-UM-1049-02, Issue 2
The separate control of K1 and K2 permits another test scenario. Two external HDSL2 spans can be looped
together at TB6 if the two H2TU-C line units that connect to the two spans both enable their MTAF states and
close K1 in each unit. This will loop the two pairs together and allow metallic cable tests to be performed from
any point in the loop where both pairs can be accessed.
Future enhancements to the H2TU-C will also allow the following seven bit in-band commands to control K1 and
K2:
MTAF (Enable K2)
MTAE (Enable K1)
DISABLE K1 or K2
Dual DSX-1 Port Option
Figure 12 on page 30
payload from the HDSL2 span is routed to either of the two Line Interface Units (LIU) Auxiliary (AUX) LIU and
Multiplexer (MUX) LIU as controlled by the following three settings of the Active DSX-1 (ADS1) user options:
•
MUX (M)
In the MUX setting, the I/O DS1 payload from the field is connected to the MUX LIU which connects it to
the MUX IN and OUT DSX-1 signal levels at the S3 card-edge connector interface. This interface connects
to one of the HiGain M13 multiplexers that plugs into the HMS-358 shelf. An AIS out-of-service indicating
pattern is sent toward the Auxiliary LIU for the MUX setting. Additionally, the input port of the AUX LIU
is monitored for a valid DS1 signal and an AUX LOS alarm is displayed, if no signal is present.
•
AUX (A)
The AUX setting of the ADS1 option routes the I/O DS1 payload to the AUX LIU. This LIU converts the
payload to the IN and OUT signal levels at the AUX DSX-1 output pins at S1 of the card-edge connector
which provides access to an external DSX-1 cross-connect panel.
The AUX setting of ADS1 also supports a subset of four more user options if the MUX DSX-1 interface is
connected to a HiGain MUX. These four options, which can only be initiated from the shelf's HMU-319
management card, are called Monitor Facilities (MONF), Monitor Equipment (MONE), Split Facilities
(SPTF), and Split Equipment (SPTE) and are described as follows:
• The MONF setting routes the signal received from the facilities at the I/O DS1 payload interface to the
MUX, through the MUX LIU, where it can be examined by the MUX test circuits.
•
The MONE setting operates like the MONF setting but operates on the signal received from the
equipment.
•
The SPTF setting forces ADS1 to its MUX setting and presents the full I/O DS1 facilities payload to the
MUX for testing.
• The SPTE forces ADS1 to its CTHR setting and presents the full DSX-1 equipment signal from the AUX
port to the MUX for testing. Since both the SPTF and SPTE settings disrupt the original AUX circuit,
both modes create minor alarm conditions identified as either ALPM SPTF or ALRM SPTE
•
Cut-through (CTHR) (C)
The CTHR setting of ADS1 disconnects both LIUs from the I/O DS1 payload and connects the two LIUs in
tandem. This allows a DSX-1 circuit from the normal DSX-1 interface (typically a HiGain MUX) to be
cross-connected to the external DSX-1 cross-connect panel by way of the AUX DSX-1 interface.
The Equalizer Select option settings apply to either the AUX or MUX port as determined by the
setting (AUX or MUX) of the ADS1 option. The equalizer of the unselected port is set to 0. The
equalizer settings apply to the AUX port when the Cut-Through setting is selected.
H2TU-C-319 List 4E
1010011
1011110
1011011
is the block diagram of the H2TU-C Dual DSX-1 Port option. The Input/Output (I/O) DS1
January 9, 2002
Provisioning
31