Remote Digital Loopback - Paradyne COMSPHERE 3610 Operator's Manual

COMSPHERE 3600 Series Data Service Units

Remote Digital Loopback

Remote Digital Loopback (RL) is typically used in
support of testing by an external device, such as a protocol
analyzer connected to the local DSU's DTE interface. A
test message from the external device is looped back from
the receiver to the transmitter in the remote DSU and
returned to the local DSU (Figure 4-7).
NOTE
The Remote Digital Loopback
command is not available when
the LPDA-2 configuration option is
enabled.
In Remote Digital Loopback, the local DSU (control or
tributary) puts the remote DSU into Digital Loopback.
NOTE
A control DSU can originate a
Remote Digital Loopback in a
point-to-point or multipoint
network, whereas a tributary DSU
can originate a Remote Digital
Loopback in a point-to-point
network only.
4-20
disruptive except when a dial backup session is active. It
is used to determine whether a control DSU, a single
tributary, and the network between them are functioning
properly. This requires a network connection to both
DSUs. However, a DTE connection to the remote DSU is
not required.
Loopback can also be initiated by the DTE by raising
Pin 21 of the EIA-232-D/V.24 interface or Pin N of the
V.35 interface, provided the Remote Digital Loopback by
DTE (RL by DTE) configuration option is enabled.
menu, make the following selections:
Figure 4-7. Remote Digital Loopback
July 1999
For a DSU, Remote Digital Loopback is session-
In a point-to-point network only, Remote Digital
To access Remote Digital Loopback from the top-level
Local (F1)
Test
DSU (select active core)
Lpbk
RL
Port Select (when not operating in single-port
mode)
Trib Address (control DSU only)
3610-A2-GB91-90