Cisco Systems IGX 8400 manual Y1 Interface Back Card BC-Y1

Network Trunk Module

Table 4-20		Data and Control Leads Supported with BC-SR
Transmit				Receive
Lead	Name		Interface	Lead	Name	Interface
TX	Transmit data		All	RX	Receive data	All
RTS	Request to Send		V.35	CTS	Clear to Send	V.35
DTR/C	Data Terminal Ready		All	DSR/I	Data Set Ready	All
LL	Local Loop		EIA/TIA-422	DCD	Data carrier select	V.35
RL	Remote Loop		EIA/TIA-422	RI/IC	Ring Incoming Call	V.35
IS	Terminal In Service		EIA/TIA-422	TM	Test mode	V.35
SS	Select standby		V.35	SB	Standby indicator
SF	Sig rate select			SI	Signalling rate

Y1 Interface Back Card (BC-Y1)

The BC-Y1 back card provides a Japanese Y1 trunk interface for an NTM. The BC-Y1 can reside in any rear slot 3 through 8 in an Cisco IGX 8410, 3 through 16 in an Cisco IGX 8420, or 3 through

32 in an Cisco IGX 8430. The BC-Y1 provides:

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An interface to Japanese “Y” Trunk (Y1) lines

Support for Y1 trunk formatted signaling

Support for 24-channel, 1.544 Mbps operation

Support for fractional rates

Coded Mark Inversion (CMI) line coding

Statistics for Y1 line events (such as loss of framing, loss of signal, and framing errors.)

•Support for local and remote loopback at the Y1 interface and the local bus interface for fault isolation

The BC-Y1 supports two clock modes. These are normal clocking and loop timing. The system operator selects the mode through software control. Normal clocking uses the receive clock from the network for incoming data and supplies the transmit clock for outgoing data. This clock can be used to synchronize the node.

Loop timing uses the receive clock from the network for the incoming data and turns the receive clock around for timing the transmit data.

Figure 4-26and Table 4-21provide descriptions of the BC-Y1 status LEDs and connections on the faceplate. When you correlate the items in the figure and table, read from the top to the bottom.

4-44Cisco IGX 8400 Series Reference