Zhone Technologies 900 - Manual (Page 32)

1-20 IMACS System Release 5.1.6 Data Cards
Model No. Running Head HSU Card User Screens and Settings HSU Card
On the HSU-T V11 and HSU-T 530/35 Cards, the same choices above appear if the port Mode
is set to dce. For a dte port, the choices are dce, local, and off. The dce loopback is
functionally identical to the dte loopback depicted in Figure 1-10, and the local loopback is
the same as the net loopback depicted in Figure 1-11.
LB GEN MODE
The Loopback Generation Mode (LB GEN MODE) setting defines the type of inband loop-up
and loop-down codes that will be sent to the remote equipment. Three industry-standard codes
are supported: dds, which sends a DDS-compatible latching loopback code in each of the
DS0s that make up the circuit; v.54, which is compatible with CCITT V.54 standard and ft1,
which is compatible with ANSI Fractional T1 standards. The final option, perf (performance
data), activates an 8 kbps performance data monitoring channel (isolated from the total
bandwidth of the circuit) that collects end-to-end performance statistics from a local HSU
Card to a remote HSU Card.
On the HSU-T V11 and HSU-T 35 Cards, the same choices above appear if the port mode is
set to dce. For a dte port, this setting is always n/a.
LB GEN
If you selected v.54, ft1, or perf as the Loopback Generation (LB GEN) mode setting, the
Loopback Generation setting allows you to send an on (loop-up command) or off (loop-down
command). If you selected dds as the Loopback Generation mode, this setting allows you to
define the type of DDS loopback that you wish to generate. The four options are ocu (Office
Channel Unit), dsu (Data Service Unit), csu (Channel Service Unit), and ds0 (a full 64 kbps
loopback). Figure 1-12 through Figure 1-14 show where these loopbacks occur. You can also
turn all DDS remote loopbacks off.
Note that you cannot perform loop-up and loop-down commands on more than one port of the
same card simultaneously. You must finish all loopback operations on one port before starting
them on another port.
On the HSU-T V11 and HSU-T 530/35 Cards, the same choices shown above appear if the
port Mode is set to dce. For a dte port, the choices are llb (local loopback), rlb (remote
loopback), and off. The llb setting loops the incoming signal from the network back toward
the network and far end. This loopback occurs at the HSU-T V11 or HSU-T 35 Card. The rlb
performs the same loopback at the far-end card.