Table Of Contents

BPX Switch Cabling Summary

Trunk Cabling

Power Cabling

AC Powered Nodes

DC Powered Nodes

LM-BCC Cabling

Auxiliary and Control Port Cabling

LAN Port Cabling

Modem Cabling

External Clock Input Cabling

External Alarm Cabling

Standard BPX Switch Cables

Redundancy "Y" Cable

BPX Switch Cabling Summary

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This chapter specifies the cabling required to install the BPX switch.

Contents of this chapter include:

• Trunk Cabling

• Power Cabling

• LM-BCC Cabling

• External Alarm Cabling

• Standard BPX Switch Cables

• Redundancy "Y" Cable

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Note In all cable references:
The Transmit direction is from the BPX switch.
The Receive direction is to the BPX switch.

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Trunk Cabling

Trunk cables connect the customer DSX-3 crossconnect point or T3-E3 Interface Module to the BPX switch at the LM-3T3 back card (see Table 31-1).

Table 31-1 Trunk Cables 

Cable Parameter	Description
Type:	75-ohm coax cable (RG-59 B/U for short runs, AT&T 734A for longer runs). Two per T3/E3 line (XMT and RCV). For European shipment of the BXM-E3 cards, in order to meet CE mark transient test requirement (IEC1000-4-4), RG-17G double shielded SMB cable must be used.
Max. Length:	450 feet max. between the BPX switch and the DSX-3/E3 point.
Connector:	Terminated in male BNC; Rx is receive from trunk, Tx is transmit to trunk.

Power Cabling

Power connections are made to the AC Power Supply Shelf or the DC Power Entry Module at the rear of the BPX switch. For acceptable cable and wire types, see Table 31-2 and Table 31-3.

AC Powered Nodes

AC power cables may be provided by you or ordered from Cisco. Several standard cables are available (see Table 31-2). AC cables with other plugs or different lengths may be special ordered.

For those who wish to construct their own power cable, the cable must mate with an IEC320 16/20A male receptacle on the rear of the AC Power Supply Assembly.

Table 31-2 AC Power Cables 

Cable Parameter	Description
Cable:	Provided with 8 feet (2.3 m.) of 3-conductor wire with plug.
Plug: customer end	20 A NEMA L620, 3-prong plug (domestic) or 13 A 250 Vac BS1363, 3-prong fused plug (UK, Ireland) CEE 7/7 (Continental Europe) AS3112 (Australia/New Zealand) CEI23-16/VII (Italy)

DC Powered Nodes

DC wiring is generally provided by the customer. Table 31-3 lists the cable parameters.

Table 31-3 DC Power Wiring 

Cable Parameter	Description
Wiring:	Single conductor, 8 AWG recommended wire gauge, 75×C insulation rating, copper conductors only. Provision is provided for attaching conduit.
Connection:	90× ring lug for #10 screw terminal block.

LM-BCC Cabling

LM-BCC cabling connects data ports on the LM-BCC to control terminals and modems. It is also used for external clock inputs from a clock source.

See for more details on peripherals that can be attached to these ports.

Auxiliary and Control Port Cabling

The auxiliary and control ports are used to connect one of the nodes in the network to a control terminal or modem connections for remote alarm reporting or system monitoring. For details on this cable, see Table 31-4 and Table 31-5.

Table 31-4 Auxiliary and Control Port Cabling 

Cable Parameter	Description
Interface:	RS-232 DCE ports.
Suggested Cable:	24 AWG, 25-wire. A straight-through RS-232 cable is used for a terminal or printer connection. A null modem cable may be needed when interfacing with modems on either port.
Cable Connector:	DB-25, subminiature, male. Table 31-5 contains a list of the port pin assignments.
Max. Cable Length:	50 feet (15 m)

The auxiliary and control port pin assignments are listed in Table 31-5.

Table 31-5 Auxiliary and Control Port Pin Assignments 

Pin#	Name	Source	Description
1	FG	both	Frame Ground
2	TxD	DTE	Transmit Data
3	RxD	DCE	Receive Data
4	RTS	DTE	Request to Send
5	CTS	DCE	Clear to Send
6	DSR	DCE	Data Set Ready
7	SG	both	Signal Ground
8	CD	DCE	Carrier Detect
20	DTR	DTE	Data Term Ready

LAN Port Cabling

The LAN connection is used to connect one of the nodes in the network to a Cisco WAN Manager NMS workstation (see Table 31-6 and Table 31-7).

Table 31-6 LAN Port Cabling 

Cable Parameter	Description
Interface:	Ethernet DCE port.
Suggested Cable:	TBS
Cable Connector:	DB-15, subminiature, male. Table 31-7 contains a list of the port pin assignments.
Max. Cable Length:	50 feet (15 m.) max. to interface adapter.

The LAN port pin assignments are listed in Table 31-7.

Table 31-7 LAN Port Pin Assignments 

Pin #	Name	Pin #	Name
1	Shield	—	—
2	Collision Presence +	9	Collision Presence -
3	XMT +	10	XMT -
4	Reserved	11	Reserved
5	RCV +	12	RCV -
6	Power return	13	Power (+12V)
7	Reserved	14	Reserved
8	Reserved	15	Reserved

Modem Cabling

For modem cabling information, see "Connecting Temporary Terminal and Attaching Peripherals."

External Clock Input Cabling

This cabling is for making external clock connections for use by the BCC-32 and BCC-4 back cards.

The BCC-32 uses the BCC-bc back card.

The discontinued BCC-3 and BCC-4 both use the BCC-3-bc back card.

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Note The clock output from the BPX 8600 external clock connector is not a T1 or E1 pulse stream. It is a TIA 422A square wave at T1or E1 rates (i.e. a square wave at either 1.544 Mbps or 2.048 Mbps.)

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T1 Clock Cabling

Table 31-8 through Table 31-11 lists T1 clock cabling details.

Table 31-8 External Clock Cabling 

Cable Parameter	Description
Cable Type:	22 AWG, ABAM individually shielded twisted pair. Two pair per T1 line (1 transmit and 1 receive).
Cable Connector:	Male DB-15 subminiature. See Table 31-10 through Table 31-11 for pinouts.
Max. Cable Length:	533 ft (162 m.) maximum between the BPX switch and the first repeater or CSU. Selection of cable length equalizers.

Table 31-9 T1 Connection to XFER TMG on BCC-bc 

Pin #	Description
1	Transfer timing ring
2	Transfer timing tip
3 & 4	Transfer timing shield

Table 31-10 T1 Connection to EXT TMG on BCC-bc 

Pin #	Description
2	Receive pair shield
3	Receive tip
11	Receive ring

Table 31-11 T1 Connection to EXT 1 or EXT 2 on BCC-3-bc 

Pin #	Description	Function
1	Transmit tip	Transmit T1 timing signal synchronized to the node
2	Transmit pair shield
3	Receive tip	Receive clock for synchronized clock source for node
4	Receive pair shield
7	Transfer timing tip
8	Transfer timing shield
9	Transmit ring
11	Receive ring
15	Transfer timing ring

E1 Clock Cabling

Table 31-12 through Table 31-15 lists E1 clock cabling details.

Table 31-12 E1 Connector Pin Assignments for External Clock 

Connector	Description
Cable Type:	75-ohm coax cable for unbalanced connection or 100-120-ohm twisted pair for balanced connection. Two cables/pairs (1 transmit, 1 receive) per E1 line.
Cable Connector:	Two female BNC for unbalanced connection; male DB15 for balanced connection. See Table 31-13 and Table 31-15 for pinouts.
Max. Cable Length:	Approximately 100 meters maximum between the BPX switch and the first repeater or CSU. Equalizer for cable length.

Table 31-13 E1 Connection 75 Ohm to EXT TMG on BCC-bc or BCC-3-bc 

Connector	Description
BNC	Receive E1 from trunk

Table 31-14 E1 Connection 100/120 Ohm to EXT TMG on BCC-bc 

Pin #	Description
2	Receive pair shield
3	Receive tip
11	Receive ring

Table 31-15 E1 Connection 100/120 Ohm to EXT 1 or EXT 2 on BCC-3-bc 

Pin #	Description	Function
1	Transmit tip	Transmit T1 timing signal synchronized to the node
2	Transmit pair shield
3	Receive tip	Receive clock for synchronized clock source for node
4	Receive pair shield
7	Transfer timing tip
8	Transfer timing shield
9	Transmit ring
11	Receive ring
15	Transfer timing ring

External Alarm Cabling

This cable (see Table 31-16) is for connecting network alarm outputs to the LM-ASM ALARM OUTPUT connector only. Table 31-17 lists the pinouts for the network alarm outputs.

Table 31-16 External Alarm Cabling 

Cable Parameter	Description
Interface:	Dry-contact relay closure
Wire:	24 AWG, shielded, 6-pair
Connector:	DB-15, Subminiature, male

Table 31-17 Network Alarm Pin Assignments 

Pin	Alarm	Description
1	Audible—Major	Normally open
2		Common
9		Normally closed
4	Visual—Major	Normally open
5		Common
12		Normally closed
7	unused	n.c.
8	unused	n.c.
3	Audible—Minor	Normally open
11		Common
10		Normally closed
6	Visual—Minor	Normally open
14		Common
13		Normally closed
15	unused	n.c.

Standard BPX Switch Cables

Table 31-18 lists the various cables that may be ordered directly from Cisco.

Cable lengths are specified as a suffix to the Cisco model number. For example 5610-50 indicates a 50 foot cable. Cables are generally available in the following standard lengths:

•10 ft (3 m)

•25 ft (7.6 m)

•50 ft (15 m)

•75 ft (22.8 m)

•100 ft (30 m)

Lengths of 101 ft. (30 m.) to 600 ft. (183 m.) are available on a special order.

When a cable is connectorized, the connector gender (male-female) is indicated as well as the number of pins. For example, RS-232/M25-M25 indicates a cable terminated with a male DB25 at both ends.

Table 31-18 Standard Cables Available from Cisco 

Model#	Description	Usage
T3-E3-10 T3-E3-25 T3-E3-50 T3-E3-75 T3-E3-xx	75 W coax/BNC-BNC, 10' 75 W coax/BNC-BNC, 25' 75 W coax/BNC-BNC, 50' 75 W coax/BNC-BNC, 75' length to be specified	T3 or E3 trunk interface
5620	RS-232/M25-F25	Control port to control terminal or ext. window device
5621	RS-232/M25-M25 special	Control or Aux. port to modem
5623	RS-232/M25-M25	Aux. port to ext. window device
5601	Ground cable	DC
5670	Molex-pigtail	DC
5671	Spade lug-pigtail	DC

Redundancy "Y" Cable

The redundancy cables are a special "Y" cable available from Cisco. They are required for redundant trunk and data interfaces.

Table 31-19 lists the Y-cables used with various BPX switch back cards.

Table 31-19 Redundancy Y-Cables 

Y - Cable	Used On	Cisco P/N
T3 trunk	LM-3T3	TBS
E3 trunk	LM-3E3	TBS
Aux./Cont. ports	LM-BCC	TBS
Ext. Clk. In	LM-BCC	TBS
Ext. Clk. Out	LM-BCC	TBS