Direct Connect (2 ACC — connected back-to-back using
loopback cable).
Connected to MODEM (or External DCE device).
Direct Connect (ACC and PSI connected back-to-back using
loopback cable).
NOTE: Auto dial is not supported on ACC (outbound Dial is
not supported, but inbound connections are supported). Configure Modem
Type to 0 (which is leased or Direct Connect).
When the WAN port is externally connected to the DCE (like
a modem) which provides an external clock, then configure Clock
source as External.
When connecting ACC on one system to ACC on other systems
using a loopback cable (Null Modem):
Clock source in one system should be configured for 1
(External clocking) and another should be connected for 0 (internal
clocking).
When connecting ACC on one system to a PSI on a different system
(using loopback cable), always configure Clock source on the
ACC port to the internal clocking.
Local Mode in one should be 6 (DCE) and another one must be
5 (DTE).
The configured clock of each port must match the corresponding
end of the loopback cable. The end of the cable labeled internal
goes to the side configured as internal clocking.
Table 3-1 Clock Source Configuration
LOOPBACK Cable End
NMMGR Configuration Fields
Physical Interface
Clock Source
Local Mode
Direct Connect
External
0 (RS-232)
1 (External)
5 (DTE) or 6 (DCE)
Internal
0 (RS-232)
0 (Internal)
6 (DCE) or 5 (DTE)
External
1 (V.35)
1 (External)
5 (DTE) or 6 (DCE)
Internal
1 (V.35)
0 (Internal)
6 (DCE) or 5 (DTE)
Connected to Modem
N/A
1 (V.35 or 0 (RS-232)
1 (External
6 (DCE) or 5 (DTE)
Direct Connect
Internal
0 (RS-232)
0 (Internal)
6 (DCE) or 5 (DTE)
ACC/PSI
N/A
1 (V.35)
0 (Internal)
6 (DCE) or 5 (DTE)
Connected to Modem
N/A
1 (V.25) or 0 (RS-232)
1 (External)
6 (DCE) or 5 (DTE)
Notes:
The RS-232 loopback cables are asymmetrical and are labeled "Internal"
on one end and "External" on the other end. The configured clock modes of
each port must match the corresponding end of the loopback cable.
The V.35 loopback cables are symmetrical and may be connected either
way round. One port of the pair should be configured for internal (Int)
clock and the other to use the (Ext) clock mode.