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5Section 61182007L1-5, Issue 161182007L1-5A
REG Loopback
The REG HDSL transceivers are looped back toward
the LTU. This loopback enables a complete checkout
of the LTU data path, the HDSL link between the
LTU and the REG, and the REG data path. The REG
loopback is activated via the V.24 craft interface.
Front Panel
Display Message/Condition:
LLOS LTU E1 Loss of Sync
NLOS NTU E1 Loss of Sync
LERR LTU E1 error
NERR NTU E1 error
LBPV LTU E1 Bipolar violation (BPV)
NBPV LTU E1 Bipolar violation (BPV)
LOS1 No synchronization of LTU and NTU on
loop 1
LOS2 No synchronization of LTU and NTU on
loop 2
HER1 HDSL loop1 error
HER2 HDSL loop2 error
1=XX* Loop 1 in Sync
2=XX* Loop 2 in Sync
* XX is the Signal Quality Level of the loop and
ranges from 0-20, where 0 is an indicator of poor
signal quality and 20 represents good signal quality.
Display Off Mode
The display enters Display Off Mode from Status
Mode after 5 minutes with no activity on the display
switch. While in this mode, the display is completely
off.
The display will return to Status Mode under the
following conditions:
• When either MODE or SELECT is activated.
Display starts again when the switch is released
• When a message other than loop margin is to be
displayed
5. SCU CONTROL PORT OPERATION (HDSL)
The Total Access 3010 SCU provides a faceplate-
mounted DB-9 connector that supplies an RS-232
interface for connection to a controlling terminal. The
pinout of the DB-9 is illustrated in Figure 5. The
terminal interface operates at data rates from 1.2 kbps
to 19.2 kbps. The asynchronous data format is fixed at
8 data bits, no parity, and 1 stop bit. The supported
terminal type is VT100 or compatible.
6
7
8
9
1
2
3
4
5
TXD (Transmit Data)
SGN (Signal Ground)
RXD (Receive Data)
Figure 5. RS-232 (DB-9) Pin Assignments
Figure 4. HDSL Loopbacks
G.703
LTU
LOCAL
LOOP
LTU Network-Side Loopback
NTU
LTU
LOCAL
LOOP
NTU Customer-Side Loopback
NTU
LTU
LOCAL
LOOP
LTU Customer-Side Loopback
NTU
X
X
G.703
G.703
LTU
LOCAL
LOOP
NTU Network-Side Loopback
NTU
X
G.703
G.703
X
AIS
LTU
REG Network-Side Loopback
NTU
G.703G.703
REG
AIS
AIS
AIS
X
X = Signal Inactive
LTU
Dual REG Network-Side Loopback
REG
G.703
REG NTU
X
X
AIS
LTU
LOCAL
LOOP
LTU and NTU Bilateral Loopback
G.703G.703
NTU
G.703AIS
G.703