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

28 Chapter3

Conﬁguration

Conﬁguration of Clock Source Using NMMGR

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:

1. 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.

2. 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.