8-port Serial PCI ACC Multiplexer Installation & Service Guide (30291-90508)

Chapter 3 27

Conﬁguration

Conﬁguration of Clock Source Using NMMGR

3 Conﬁguration

Conﬁguration of Clock Source Using NMMGR

Refer to Table 3-1 to conﬁgure the clock source parameter using

NMMGR:

1. Direct Connect (2 ACC — connected back-to-back using loopback

cable).

2. Connected to MODEM (or External DCE device).

3. 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.