Specifications

Excalibur Multirate DAP Installation and Operation
2-6
Table 2-2. Clear Secondary Channel Rates
DDS Line DDS-SC, LDM, LADC
1
DDSNI, C64NI
2.4 Kbps 75 bps 75 bps
4.8 Kbps 75, 150 bps 75 bps
9.6 Kbps 75, 150, 300 bps 75, 150 bps
19.2 Kbps 75, 150, 300, 600
2
bps 75, 150, 300 bps
56 Kbps 75, 150, 300, 600
2
, 1200
2
bps
75, 150, 300 bps
64 Kbps Not Applicable 75, 150, 300 bps
1. LADC is only available for units equipped with the Model A or C Aggregate
card.
2. The 600 and 1200 bps rates are not available for units equipped with the
Switched 56 IDBU or the ISDN IDBU feature.
Antistreaming
The RTS Antistreaming feature prevents a DTE from holding the communication channel
indefinitely. When a DTE keeps its RTS signal raised for longer than a user-selectable
time period, the DAP disconnects it. The streaming DTE must lower its RTS signal
before the DAP will scan it again.
DCD Antistreaming is effective only when V.13 DCD Simulation is enabled. This
function acts as a backup to prevent an application from becoming stalled as a result of a
missed V.13 DCD drop code or other similar condition caused by a line hit or a power
failure.
Analog Integral Dial Operation
The Excalibur DAP's Analog IDBU feature enables both the primary and secondary
channels to transmit data across the dial-up telephone line when the dedicated line fails.
It can also enable the secondary channel to transmit data across the dial-up line, while the
primary channel transmits data over the digital lines. To establish the dial-up connection,
the originating DAP must place a telephone call to the answering DAP. The call can be
initiated in three ways: 1) automatically by the DAP, 2) manually through the DAP's
front panel, or 3) manually through the CMS system console.