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700-701-100-02 Functional Description
UTU-701 and ETU-751 List 1 August 9, 2002 17
G.704 Framing and Rate Selectable HDSL
Time slots 0 and 16 are always transported in accordance with the G.704 framing standard. Although not used by
G.703 to transport data, the rate-selectable HDSL interface treats time slots 0 and 16 as a 128 kbps increase in the
HDSL payload rate. For example, when 4 time slots are selected (256 kbps), time slots 0 and 16 are transported
along with the selected time slots, 1 though 4. This results in an HDSL payload rate of 384 kbps (that is, 256 kbps
plus the 128 kbps added by time slots 0 and 16). Table 9 lists several examples of selected and actual HDSL
payload rates.
In structured mode, time slots 0 and 16 do not contain data and are transparent to the G.703 input. The transmitted
G.703 data arrives at both the customer and network DTE at the selected HDSL payload rate. This is illustrated
in Figure 6 on page 14.
HOT SWAPPING
UTUs can be inserted and removed from any compatible shelf or enclosure with the power turned on. This will
not cause damage to the units nor will it cause interference to any other HDSL circuits that are operating within
the same shelf or enclosure.
Table 9. Examples of Selected and Actual HDSL Payload Rates
Selected HDSL Payload
Rate (kbps) / Number of
Time Slots
G.703 Time Slots Transported
Actual HDSL Payload
Rate (kbps)
64 / 1 1 (plus 0 and 16) 256
128 / 2 1 and 2 (plus 0 and16) 256
192 / 3 1 through 3 (plus 0 and16) 320
256 / 4 1 through 4 (plus 0 and16) 384
384 / 6 1 through 6 (plus 0 and16) 512
512 / 8 1 through 8 (plus 0 and16) 640
640 / 10 1 through 10 (plus 0 and16) 768
768 / 12 1 through 12 (plus 0 and16) 896
896 / 14 1 through 14 (plus 0 and16) 1024
1024 / 16 1 through 15 and 17 (plus 0 and16) 1152
1152 / 18 1 through 15, 17 through 19 (plus 0 and16) 1280
1536 / 24 1 through 15, 17 through 25 (plus 0 and 16) 1664
1920 / 30 1 through 15, 17 through 31 (plus 0 and 16) 2048
1984 / 31 1 through 31 (plus 0) 2048
2048 / 32 0 through 31
(a)
(a) The line and desktop units operate in the unstructured mode when 32 time slots are selected.
2048