Cisco Systems OL-12811-01 manual Modular Access Router, NM-1CE1T1-PRI, NM-2CE1T1-PRI

Connecting Cisco ISDN PRI Network Modules to the Network

Channelized T1/E1 PRI Network Modules with G.703

Table 1	Modular Access Routers Supporting Cisco Channelized T1/E1 PRI Network Modules
	with G.703
Modular Access Router		NM-1CE1T1-PRI	NM-2CE1T1-PRI
Cisco 3660		Yes	Yes
Cisco 37xx		Yes	Yes

Figure 1 and Figure 2 show the faceplates for the 1-port and 2-port channelized T1/E1 PRI network modules with G.703.

Figure 1	1-Port Channelized T1/E1 PRI Network Module with G.703
NM-1CE1T1-PRI
	RX	TX	CD	LP
	MON	MON
			RA	T1	AIM
				E1-BAL
					EN
	C0		LA	E1-UNBAL

CTLR 0

82886

Figure 2	2-Port Channelized T1/E1 PRI Network Module with G.703
NM-2CE1T1-PRI
	CD	LP	RX		TX	CD	LP
			MON		MON
RA			T1	C1		RA	T1	AIM
			E1-BAL				E1-BAL
								EN
LA			E1-UNBAL	C0		LA	E1-UNBAL
		CTLR 1					CTLR 0

82887

Enabling Wetting Current on Channelized T1/E1 PRI Network Modules with G.703

Wetting current is a small amount of electrical current (60 to 140 milliamps) sent from the central office to the card to prevent the corrosion of electrical contacts in the module network connection.

The wetting current feature can be enabled or disabled by the end user. It is controlled by the location of a jumper on the J8 (CTLR 0) and J9 (CTLR 1) connectors on the network module. (See Figure 3.)

To enable the wetting current feature, connect pins 1 and 2 on the J8 and J9 connectors with the jumper. To disable the wetting current feature, either remove the jumper completely, or use the jumper to connect pins 2 and 3 on the J8 and J9 connectors.

The card is shipped with the jumper connecting pins 2 and 3 on the J8 and J9 connectors, disabling the wetting current feature.

Connecting Cisco ISDN PRI Network Modules to the Network

3