User manual
Dynamix UM-SB Series User Manual V0.06
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There are two types of SHDSL.bis mode, STU-C and STU-R. STU-C means the terminal of central
office and STU-R means customer premise equipment.
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Notice that this link item is only for 4-wire models.
For 4-wires model, it can use only the first one pair for the single pair DSL wire application.
2-wire mode
In this mode, each wire pairs of SHDSL.bis router must be configured with the same line rate. If
one pair fails then the entire line must be restarted. It also has the Conexant M-pair standard used
with connection to other router with Conexant chip set solution.
M – Pair Mode
Two DSL pairs are working simultaneously. When one pair of both is disconnect, the other pair will
keep working.
Auto Fall Back Mode
Only one of two pairs are working, other pair is standby. If the working pair fails, the standby pair
will start up to continues.
Stanby Mode
For 4-wires model, each pair will connect to two different remote device, which may or may not be
in the same location.
Multi–Link Mode
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You can setup the data rate by the multiple of 64Kbps where n is from 3 to 89.
If the router is 4 wire models and doesn’t use on 2-wire mode, the line rate will double from 2-wire
model’s setting.
2-wire model 4-wire model
Annex A/B TCPAM-16 192~2304 kbps(n=3~36) 384~4608 kbps(n=6~72)
Annex AF/BG
TCPAM-16
192~3840 kpbs (n=3~60)
384~7680 kbps(n=6~120)
TCPAM-32
768~5696 kpbs(n=12~89)
1536~11392 kbps(n=24~178)
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There are four types of SHDSL.bis Annex type, Annex-A, Annex-B, Annex-AF, and Annex-BG.
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Generally, you cannot need to change SNR margin, which range is from -10 to 21. SNR margin is
an index of line connection. You can see the actual SNR margin in STATUS SHDSL.bis. The larger
is SNR margin; the better is line connection quality. If you set SNR margin in the field as 3, the
SHDSL.bis connection will drop and reconnect when the SNR margin is lower than 3. On the other
hand, the device will reduce the line rate and reconnect for better line connection.