Toshiba Strata AirLink DK40i, Installation And Maintenance Manual

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T1
Strata DK I&M 6/00
8-1
T1
8
This chapter covers information on using T1/DS-1 interfacing for the DK40i, DK424 and DK424i,
Release 4.3. T1/DS-1 interfacing is not available for the DK14.
Note
When “DK” appears in this chapter, it refers to any of the systems that can interface with
T1/DS-1.
Channelization
The Strata RDTU PCB provides T1/DS-1 interface for up to 24 channels on the DK40i, DK424
and DK424i. Each channel can be individually set for loop start, ground start, Tie, or DID line
operation (voice only, not data lines). Each RDTU can be set in system programming to activate
(1~8), (1~16), or (1~24) channels (lines). Fractional increments of 4, 12, and 20 are also possible
but the RDTU will still assign 8, 16, or 24 channels respectively in system software.
Example: If only 12 channels of fractional T1 are used, assign RDTU as a 16 channel RDTU. The
system will assign 16 CO lines to the RDTU even though only 12 CO lines will be used. To busy
out unused RDTU channels (see
“System Programming for T1” on Page 8-3 , Step 4 ). Use Program
03 to set the quantity of RDTU channels.
Slot Assignments
Up to eight RDTU PCBs can be installed in a DK to provide up to 192 lines. RDTU PCBs can be
installed in the same cabinets that have analog type CO line PCBs installed. RDTU PCBs must be
placed in designated slots in each of the DK cabinets. (See
Tables 4-4 , 4-5 on page 4-5 in Chapter
4 – DK424 Configuration or “T1 Digital Line PCBs” on Page 6-29 for RDTU slot installation
rules)
If an RDTU is installed in a cabinet (in some cases one or two slots to the right of the RDTU may
not be used in that cabinet) the number of unusable slots in a cabinet (none, 1 or 2) depends on
which slot the RDTU occupies and how many lines (8, 16, or 24) the RDTU is programmed to
provide. Use Program 03 to set the RDTU slot assignments and Channel quantities (Code 71 = 8
ch., Code 72 = 16 ch., and Code 73 = 24 ch.).