Paradyne 3800Plus Supplementary Manual page 2

P a r a dyn e
3600 Series Data Service Units ARDIS Abstract
Document Number 3600-A2-GZ60-00
May 1995
Purpose
This special firmware release adds the ability of ARDIS cell sites to backup at 28.8 kbps using external AT&T
Paradyne 3800Plus and 3900 Series (V.34bis) modems until the 3600 Series 28.8 kbps dial backup module
(DBM) is available.
Full backup capability is provided. Backup can be initiated automatically from the diagnostic control panel
(DCP), or manually initiated from the DCP or a 6800 Series network management system (NMS).
Restrictions
Internal dial backup modules (DBMs) are not supported; the DSU ignores an installed DBM.
External modems receive clocking from the DSU when in Backup mode. The TxClkSource shown in
Table 1 should always be set to DCE. Other selections are not supported.
Fallback is not supported.
Only single-port DSU and point-to-point TDM applications are supported (see Customer Applications).
Since port speeds cannot be lowered for backup, some TDM ports may have to be disabled due to
bandwidth limitations.
The following diagnostic tests are not supported in external backup: Digital Test (DT), Remote Digital
Loopback (RL), and Bit Error Rate Test (BERT).
Both the control and tributary DSUs must be equipped with this special ARDIS firmware, which supports
external backup.
Customer Applications
Figure 1 shows the configurations supported by this release; no other configurations are supported.
The basic ARDIS configuration is a point-to-point DSU-TDM operating at 56 kbps over the DDS line, with
Ports 2 and 3 configured for 14.4 kbps and Ports 4 through 6 configured for 2.4 kbps. The first application is
connected to Port 2 and four additional ports are available for application use. An EIA-232 crossover cable
(feature number 4951-035F) is needed to connect the DSU to the modem.
If all six ports are needed, enabling Port 1 requires a
V.35-to-EIA-232 converter. Configure Port 1 to operate using the
V.35 interface (for Flex/MUX, set the DTE Port option to V.35 in
TDM Port Configuration Options; when not Flex/MUX, set the DTE
Port option to V.35 in General Configuration Options).
NOTE
1