Table of Contents
Cabling SummaryT3 Trunk Cabling
Frame Relay Cabling
E1 Cabling
12IN1-S4 V.35/X.21 Back Card
HSSI Port Connectors
Cabling for RJ-48 Connectors on T1 and E1 Ports
AC Power Cabling
Control and Clock Cabling
External Alarm Cabling
Standard MGX 8250 Cables
Redundancy Y-Cable
Cabling Summary
Introduction
This appendix contains details on the MGX 8250 cabling.
 |
Note In all cable references, the transmit direction is away from the switch, and the receive direction is toward the switch. |
T3 Trunk Cabling
A trunk cable connects each T3 port on the BNC-2T3 back card to a T3 port on the co-located BPX-8600-series node. See Table B-1 and Table B-2 for details.
Table B-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 line (XMT and RCV). |
|
Max. Length |
450 feet max. between the BPX 8600-series node and the MGX 8250 node. |
|
Connector: |
Terminated in male BNC; Rx is received from trunk, Tx is transmitted to trunk. |
Table B-2: T3 Connector Pin Assignments
| Connector | Description |
|---|---|
|
Rx BNC |
Receive T3 from trunk |
|
Tx BNC |
Transmit T3 to trunk |
Frame Relay Cabling
This section describes the cabling and connector pinouts for the Frame Relay cards.
1 Cabling
Trunk cables connect the customer DSX-1 cross-connect point or T1 Channel Service Unit (CSU) to the node at the T1 back card.See Table B-3 and Table B-4 for details.
Table B-3: T1 Trunk/Circuit Line Cabling Specification
| Cable Parameter | Description |
|---|---|
|
Cable Type |
Western Electric 22 AWG, ABAM individually shielded twisted pair (100 ohm balanced). Two pair per T1 line (1 transmit and 1 receive). |
|
Cable Connector |
Male DB-15 subminiature. |
|
Max. Cable Length |
533 ft. (162 m) maximum between the MGX 8250 node and the first repeater or CSU. Selection of cable length equalizers. |
Table B-4: T1 Connector Pin Assignments
| Pin No. | Description |
|---|---|
|
1 |
Transmit, Tip |
|
2 |
Transmit Pair Shield |
|
3 |
Receive, Tip |
|
4 |
Receive Pair Shield |
|
9 |
Transmit, Ring |
|
11 |
Receive, Ring |
|
Note Transmit direction is toward the T1 trunk. |
E1 Cabling
E1 cables are equipped with either BNC connectors or DB15 connectors.
BNC Connector
E1 trunk cables connect the customer DSX-1 cross-connect point or E1 Channel Service Unit (CSU) to the node at the FRSM E1 back card (BNC-8E1). See Table B-5 and Table B-6.
Table B-5: E1 Trunk/Circuit Line Cabling Specification
| Cable Parameter | Description |
|---|---|
|
Cable Type: BNC-8E1 |
75-ohm coax cable for unbalanced connection. Two cables/pairs |
|
Cable Connector |
Two female BNC for unbalanced connection; male DB15 for balanced connection. See Tables A-2 and A-3 for pinouts. |
|
Max. Cable Length |
Approximately 100 meters maximum between the MGX 8250 node and the first repeater or CSU. Equalizer for cable length. |
Table B-6: E1 Connector Pin Assignments (unbalanced)
| Connector | Description |
|---|---|
|
Rx BNC |
Receive E1 from trunk |
|
Tx BNC |
Transmit E1 to trunk |
DB15 Connector
E1 trunk cables connect the customer DSX-1 cross-connect point or E1 CSU to the node at the FRSM E1 back card (DB15-8E1). See Table B-7 and Table B-8.
Table B-7: E1 Trunk/Circuit Line Cabling Specification
| Cable Parameter | Description |
|---|---|
|
Cable Type: DB15-8E1' |
Western Electric 22 AWG, ABAM individually shielded twisted pair (120 ohm balanced). Two pair per T1 line (1 transmit and 1 receive). |
|
Cable Connector: |
Male DB-15 subminiature. |
|
Max. Cable Length: |
533 ft. (162 m) maximum between the MGX 8250 node and the first repeater or CSU. Selection of cable length equalizers. |
Table B-8: E1 Connector Pin Assignments
| Pin No. | Description |
|---|---|
|
1 |
Transmit, Tip |
|
2 |
Transmit Pair Shield |
|
3 |
Receive, Tip |
|
4 |
Receive Pair Shield |
|
9 |
Transmit, Ring |
|
11 |
Receive, Ring |
|
Note Transmit direction is toward the E1 trunk. |
12IN1-S4 V.35/X.21 Back Card
The back card for the MGX-FRSM-HS1/B is the 12IN1-S4. Each port on the back card connects through a DTE version or DCE version of the Cisco 12IN1 cable. For the signals on the back card, see Table B-10 and Table B-11. The tables show the signal acronym, signal name, and signal source. The signal depends whether the back card connector is either DTE or DCE and whether the back card has been set as either X.21 or V.35 as listed in Table B-9. For the part numbers of the standard and nonstandard versions of the 12IN1 cables, see Table B-12.
Table B-9: 12IN1-S4 Cable Types
| Cable Type | X.21 | V.35 |
|---|---|---|
|
DCE |
X.21 DCE |
V.35 DCE |
|
DTE |
X.21 DTE |
V.35 DTE |
|
Note The cable type and part number are printed on a plastic band located near the smaller connector. |
Table B-10: V.35 Signals
| Signal | Name | Source |
|---|---|---|
|
RTS |
Request to Send |
DTE |
|
DTR |
Data Terminal Ready |
DTE |
|
CTS |
Clear To Send |
DCE |
|
DSR |
Data Set Ready |
DCE |
|
DCD |
Data Carrier Detect |
DCE |
|
GND |
Ground |
both |
|
B_LL |
Local Loopback |
DTE |
|
GND |
Ground |
both |
|
TxD+ |
Transmit Data |
DTE |
|
TxD- |
Transmit Data |
DTE |
|
RxD+ |
Receive Data |
DCE |
|
RxD- |
Receive Data |
DCE |
|
TXCE |
Secondary Clear to Send |
DTE |
|
TXCE |
Secondary Clear to Send |
DTE |
|
RxC+ |
Receive Clock |
DCE |
|
RxC- |
Receive Clock |
DCE |
|
TxC+ |
Transmit Clock |
DCE |
|
TxC- |
Transmit Clock |
DCE |
Table B-11: X.21 Signals
| Signal | Name |
|---|---|
|
Mode_2 |
Local connections |
|
Mode_DCE |
Local connections |
|
Ground |
Shield Ground |
|
O_TXD/RSC+ |
Transmit + |
|
OTXD/RXD- |
Transmit - |
|
O_RTS/CTS+ |
Control + |
|
O_RTS/CTS- |
Control - |
|
I_RDX/TXD+ |
Receive + |
|
I_RXD/TXD- |
Receive - |
|
ICTS/RTS+ |
Indication + |
|
I_CTS/RTS- |
Indication - |
|
I_RXC/TXCE+ |
Timing + |
|
I_RXC/TXCE- |
Timing - |
|
GND |
CCT Ground |
Table B-12: Cable Part Numbers for MGX-FRSM-HS1/BV
| Type of Cable | Far End Connector | Part Number |
|---|---|---|
|
X.21 DTE |
male |
72-1440-01 |
|
X.21 DCE |
female |
72-1427-01 |
|
V.35 DTE |
male (standard) |
72-1428-01 |
|
V.35 DTE |
female (atypical) |
72-1436-01 |
|
V.35 DCE |
female (standard) |
72-1429-01 |
|
V.35 DCE |
male (atypical) |
72-1437-01 |
|
V.35 DTE-DCE |
72-1441-01 |
|
|
Straight-through |
72-1478-01 |
|
|
Loopback plug |
72-1479-01 |
HSSI Port Connectors
The High Speed Serial Interface (HSSI) port connects through a female SCSI-II connector. This connector accords with ANSI/TIA/EIA-613. See Table B-13 for the pinouts.
Table B-13: Pinouts for SCSI-II Connector
| Pin No. | Name | Signal Function | Polarity | Signal Source |
|---|---|---|---|---|
|
11 |
SD |
Send Data |
+ |
DTE |
|
36 |
- |
|||
|
4 |
RD |
Receive Data |
+ |
DCE |
|
29 |
- |
|||
|
6 |
ST |
Send Timing |
+ |
|
|
31 |
- |
|||
|
2 |
RT |
Receive Timing |
+ |
|
|
27 |
_ |
|||
|
6 |
TT |
Terminal Timing |
+ |
DCE |
|
13 |
- |
|||
|
3 |
CA |
DCE Available |
+ |
DCE |
|
28 |
- |
|||
|
8 |
TA |
DTE Available |
+ |
DTE |
|
33 |
- |
|||
|
10 |
LA |
Loop Ckt A |
+ |
DTE |
|
35 |
- |
|||
|
12 |
LB |
Loop Ckt B |
+ |
DTE |
|
37 |
- |
|||
|
5 |
LC |
Loop Ckt C |
+ |
DCE |
|
30 |
- |
|||
|
1, 26, 7, 32, 13, 38, 19, 44, 25, 50 |
SG |
Signal Ground |
Cabling for RJ-48 Connectors on T1 and E1 Ports
For T1 and E1 ports that connect through a RJ-48 connector, each connector has
- Transmit TIP pin
- Transmit RING pin
- Receive TIP pin
- Receive RING pin
- Two pins for shielded ground
An illustration of the connector wiring appears in Figure B-1.
Figure B-1: RJ-48 Connectors
DC Power Cabling
DC Power connections are made to the DC Power Entry Modules at the rear of the MGX 8250 node. (See Figure B-2.) See Table B-14 and Table B-15 for acceptable cable and wire types. Cisco normally does not provide wiring for DC-powered systems. See Table B-14 for details on DC wiring.
Table B-14: DC Power Wiring
| Cable Parameter | Description |
|---|---|
|
Wiring: |
Three conductor, 12 AWG recommended wire gauge, min. 60ºC insulation rating, copper conductors only. Solid or stranded wires. Wire insulation stripped back 0.25 in (6 mm) at the MGX 8250 connector end. |
|
Connection: |
EURO Block. |
Figure B-2: DC Power Connections
AC Power Cabling
Either Cisco Systems or the customer can provide the AC power cord. See Table B-15 for the power cords that Cisco can supply. In addition, you can special-order AC cables with other plugs or different lengths. If you want to construct the power cord, it must mate with an IEC320 16/20A male receptacle on the back of the AC power module.
Table B-15: AC Power Cables
| Cable Parameter | Description |
|---|---|
|
Cable |
Provided with 8 feet (2.3 m) of 3-conductor wire with plug. |
|
Plug: customer end |
20A NEMA L620, 3-prong plug (U.S.) |
Control and Clock Cabling
This section describes the cables that connect to the PXM-UI-S3 card.
Maintenance and Control Ports
The maintenance (or modem) port and the control (or console) port connect a node to an ASCII terminal, workstation, or modem for remote alarm reporting or system monitoring. See Table B-16 for a description of the cabling and Table B-17 for the pinout of the associated RJ-48 connector.
Table B-16: Maintenance and Control Port Cabling
| Cable Parameter | Description |
|---|---|
|
Interface |
EIA/TIA-232—both are DTE ports. |
|
Suggested Cable |
24 AWG, 25-wire. A straight-through EIA/TIA-232 cable provides a terminal or printer connection. For an interface with modems on either port, a null modem cable may be necessary. |
|
Cable Connector |
RJ-48, subminiature, male. Table B-17 contains a list of the port pin assignments. |
|
Max. Cable Length |
50 feet (15 m) |
Table B-17: Maintenance and Control Port Pin Assignments
| Pin No. | Name | Description |
|---|---|---|
|
1 |
RTS out |
Request to Send |
|
2 |
DTR out |
Data Terminal Ready |
|
3 |
TxD |
Transmit Data |
|
4 |
GND |
Chassis ground |
|
5 |
GND |
Chassis ground |
|
6 |
RxD |
Receive Data |
|
7 |
DSR |
Data Set Ready |
|
8 |
CTS |
Clear to Send |
Modem Cable
Figure B-3 shows a modem cable that is used for connecting modems to the MGX 8250 control and maintenance ports.
Figure B-3: Null Modem Cable
External Clock Input Cabling
The external clock input cable connects the external clock inputs through the T3E3-D, T3E3-B, and SMF-155 EXT. TMG connectors. The clock may be 1.544 Mbps for T3E3-D or 2.048 Mbps for T3E3-D.
External Clock Input Cabling
The MGX 8250 has two external clock input connectors:
1. T1 RJ-48 connector
2. E1 SMB connector.
T1 Clock Cabling
The clock port can accept a T1 or E1 BITS clock input. (See Table B-18)
Table B-18: 7T1 Clock Cabling
| Pin No. | Name |
|---|---|
|
1 |
Tx ring out |
|
2 |
Tx tip out |
|
3 |
Ground |
|
4 |
Rx ring in |
|
5 |
Rx tip in |
|
6 |
No comment |
|
7 |
Test point ring out |
|
8 |
Test point tip out |
External Alarm Cabling
The external alarm cable connects to the Alarm connector on the PXM1-UI card. See Table B-19 for physical characteristics of the cable and Table B-20 for the pinouts.
Table B-19: External Alarm Cabling
| Cable Parameter | Description |
|---|---|
|
Interface |
Dry-contact relay closure. |
|
Wire |
24 AWG, shielded, 6-pair. |
|
Connector |
DB-15, subminiature, male. |
Table B-20: Network Alarm Pin Assignments
| Pin No. | 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 MGX 8250 Cables
For a list of the standard cables that Cisco can supply for the MGX 8250 switch, see Table B-21. The suffix to the model number indicates the length of the cable. For example, 5610-50 indicates a 50-foot cable. Cables are available in standard lengths of 10 ft. (3 m), 25 ft. (7.6 m), 50 ft. (15 m), 75 ft. (22.8 m), and 100 ft. (30 m). Lengths of 100 ft. (30 m) to 600 ft. (183 m) are available through a special order.
Where applicable, Table B-21 includes the gender of the connector and the number of pins. For example, EIA/TIA-232/M25-M25 indicates a cable terminated with a male DB25 at both ends.
Table B-21: Standard Cables Available from Cisco
| Model Number | Description | Usage |
|---|---|---|
|
T3-E3-10 |
75 ohm coax/BNC-BNC, 10' |
T3 or E3 trunk interface |
|
5620 |
EIA/TIA-232/M25-F25 |
PXM1-UI maintenance port to control terminal, Cisco WAN Manager, or external window device |
|
5621 |
EIA/TIA-232/M25-M25 special |
Control or maintenance port to modem |
|
5601 |
Ground cable |
DC power |
|
5670 |
Molex-pigtail |
DC power |
|
5671 |
Spade lug-pigtail |
DC power |
Redundancy Y-Cable
Special Y-cables provide line redundancy where applicable. (The Service Resource Module can also provide redundancy where certain Y-cables do not apply.) Table B-22 lists the Y-cables used with various MGX 8250 cards.
Table B-22: Y-Cable Product Names for Applicable Cards
| Applicable Card Name | Connector Hardware | Type/Standard Interface | Product Number |
|---|---|---|---|
|
PXM1-UI |
RJ-45 |
EIA/TIA-232 |
CAB-5684-06 (6-inch Y) |
|
PXM1-UI |
RJ-45 |
EIA/TIA-232 |
CAB-5684-18 |
|
PXM1-UI |
RJ-45 |
T1 BITS Clock |
CAB-5686-06 (6-inch Y) |
|
PXM1-UI |
SMB |
E1 BITS Clock |
CAB-5681-06 (6-inch Y) |
|
PXM1-UI |
SMB |
E1 BITS Clock |
CAB-5681-18 (18-inch Y) |
|
PXM1-UI |
DB15 |
Alarm Output |
CAB-5607-10 (10-inch Y) |
|
PXM1-4-155 |
SC |
SMF, MMF |
CAB-SMF-Y-SC |
|
PXM1-1-622 |
SC |
SMF |
CAB-SMF-Y-SC |
|
PXM1-2T3E3 |
BNC |
75 ohm, coaxial |
CAB-T3E3-Y |
|
MGX-BNC-3T3-M |
BNC |
75 ohm, coaxial |
CAB-T3E3-Y |
|
MGX-FRSM-2T3E3 |
BNC |
75 ohm, coaxial |
CAB-T3E3-Y |
|
MGX-CESM-T3E3 |
BNC |
75 ohm, coaxial |
CAB-T3E3-Y |
|
MGX-FRSM-HS2 |
SCSI2 |
CAB-SCSI2-Y |
|
|
SMSCFC010250-01M |
SC to FC |
72-1246-01 |