G.704 Framing And Rate Selectable Hdsl; Hot Swapping; Examples Of Selected And Actual Hdsl Payload Rates - ADC ETU-751C List 1 User Manual

700-701-100-02

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).
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.
Table 9. Examples of Selected and Actual HDSL Payload Rates
Selected HDSL Payload
Rate (kbps) / Number of
Time Slots
64 / 1
128 / 2
192 / 3
256 / 4
384 / 6
512 / 8
640 / 10
768 / 12
896 / 14
1024 / 16
1152 / 18
1536 / 24
1920 / 30
1984 / 31
2048 / 32
(a) The line and desktop units operate in the unstructured mode when 32 time slots are selected.
H S
OT WAPPING
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.
UTU-701 and ETU-751 List 1
Table 9 lists several examples of selected and actual HDSL
G.703 Time Slots Transported
1 (plus 0 and 16)
1 and 2 (plus 0 and16)
1 through 3 (plus 0 and16)
1 through 4 (plus 0 and16)
1 through 6 (plus 0 and16)
1 through 8 (plus 0 and16)
1 through 10 (plus 0 and16)
1 through 12 (plus 0 and16)
1 through 14 (plus 0 and16)
1 through 15 and 17 (plus 0 and16)
1 through 15, 17 through 19 (plus 0 and16)
1 through 15, 17 through 25 (plus 0 and 16)
1 through 15, 17 through 31 (plus 0 and 16)
1 through 31 (plus 0)
(a)
0 through 31
August 9, 2002
Functional Description
Actual HDSL Payload
Rate (kbps)
256
256
320
384
512
640
768
896
1024
1152
1280
1664
2048
2048
2048
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