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The WAN Physical Configuration Screen
WPIM-RT1 User’s Guide 3-5
• 267-399 Ft
• 400-533 Ft
• 534-655 Ft
T1 Loopback (Selectable)
Network Loopback is a testing procedure that segments the line and
allows the user to isolate faults. The selections for this field are None,
Line-Loop, and Payload-Loop. In Line-Loop the entire T-1 line is looped
back, including the framing bits, CRC, and the facility data link. This
happens before the framer. In Payload-Loop, only the 24 time slots are
looped back, which happens behind the framer, and does not include the
framing bits, CRC, and facility data link. The WPIM-RT1 must be in
Loop-Timing mode to use this option. The default setting is None.
3.1.3 WPIM Timeslot Configuration Table
The WPIM Timeslot Configuration table allows the user to configure the
way in which the Cabletron WAN module uses the T1 line. The
configuration table consists of 24 Timeslots. Each Timeslot must be
assigned an Interface number (for example, 002 for an active Interface
number or 000 if the Timeslot is not used). When an entire T1 line is
leased, all 24 Timeslots (the full T1 bandwidth) can be used. If only a
fraction of the T1 line is leased, the service provider indicates which
Timeslots to use.
Timeslots can be utilized in any way chosen. The WPIM-RT1 supports
Time Division Multiplexing (TDM) allowing channelization of circuits
(Timeslots) within the public network. For example, if the WPIM-RT1
has access to a full T1 (24 Timeslots), and the user wants to communicate
with two other sites, the configuration might look like the one shown in
Figure 3-2.
Figure 3-2 Sample Timeslot Configuration
SITE #1
SITE #2
Telco Cloud
24 Timeslots
16 Timeslots
SITE #3
8 Timeslots
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