Zhone Technologies 900 - Manual (Page 76)

2-10 IMACS System Release 5.1.6 Data Cards
Model No. Running Head SRU Card User Screens and Settings SRU Card
TX CLK
The Transmit Clock setting allows you to choose the timing source for this port. The options
are n/a if async interfacing is chosen and int (internal), if sync interfacing is chosen. The int
setting uses the Integrated Access System as the clock source, and ext allows the DTE to
generate transmit timing with EXT ports are grouped: 1,2 / 3,4,5,6 / 7,8,9,10.
LB
The Loopback setting allows you to activate local loopbacks on the SRU card. These settings
are off, toward the dte (DTE), and toward the net (network). Figure 2-5 shows a diagram of
the local loopback conditions.
Figure 2-5. Local Loopbacks
LB GEN
The Loopback Generate setting generates inband diagnostic codes that are sent to the remote
equipment These codes are compatible with DDS networks, and allow you to command a
latching loopback at remote DDS equipment. You can start loopbacks at the remote ocu
(Office Channel Unit), dsu (Data Service Unit), or csu (Channel Service Unit). Figure 2-6
through Figure 2-8 show the loopbacks locations. You can also turn each loopback off. This
field shows n/a if adpcm or hlink are chosen for the Frame parameter.
Network
SRU Card
SRU Card
WAN
Link
dte Loopback Option
net Loopback Option
DTE
DTE Network WAN
Link