M1 Network Configuration
Network Group 0-7 |
Network Shelf 0-1 |
Loops 0-255 |
INI HEX Code |
Super Loops 0-252 |
PER SIGS 0-15 |
3PE Software LD |
IGS 1 |
Junctor Jacks J1-J22 |
IGS 0 |
|
Group 0 | Shelf 0 | 0-15 | 9x | 0, 4, 8, 12 | 0 (4x) | 0G0 (EX) | 2 (5x) | J6 | J1 | 0 (5x) |
Shelf 1 | 16-31 | Ax | 16, 20, 24, 28 | 1 | 1G0 (Fx) | 3 | J17 | J22 | 1 | |
Group 1 | Shelf 0 | 32-47 | Bx | 32, 36, 40, 44 | 2 | 0G1 | 6 | J7 | J2 | 4 |
Shelf 1 | 48-63 | Cx | 48, 52, 56, 60 | 3 | 1G1 | 7 | J16 | J21 | 5 | |
Group 2 | Shelf 0 | 64-79 | Dx | 64, 68, 72, 76 | 4 | 0G2 | 10 | J8 | J3 | 8 |
Shelf 1 | 80-95 | 19x | 80, 84, 88, 92 | 5 | 1G2 | 11 | J15 | J20 | 9 | |
Group 3 | Shelf 0 | 96-111 | 1Ax | 96, 100, 104, 108 | 6 | 0G3 | 14 | J9 | J4 | 12 |
Shelf 1 | 112-127 | 1Bx | 112, 116, 120, 124 | 7 | 1G3 | 15 | J14 | J19 | 13 | |
Group 4 | Shelf 0 | 128-143 | 1Cx | 128, 132, 136, 140 | 8 | 0G4 | 18 (6x) | J10 | J5 | 16 (6x) |
Shelf 1 | 144-159 | 1Dx | 144, 148, 152, 156 | 9 | 1G4 | 19 (6x) | J13 | J18 | 17 (6x) | |
Group 5 | Shelf 0 | 160-175 | 13x | 160, 164, 168, 172 | 10 | 0G5 | - | - | - | - |
Shelf 1 | 176-191 | 14x | 176, 180, 184, 188 | 11 | 1G5 | - | - | - | - | |
Group 6 | Shelf 0 | 192-207 | 15x | 192, 196, 200, 204 | 12 | 0G6 | - | - | - | - |
Shelf 1 | 208-223 | 16x | 208, 212, 216, 220 | 13 | 1G6 | - | - | - | - | |
Group 7 | Shelf 0 | 224-239 | 17x | 224, 228, 232, 236 | 14 | 0G7 | - | - | - | - |
Shelf 1 | 240-255 | 18x | 240, 244, 248, 252 | 15 | 1G7 | - | - | - | - | |
M1 System Sizes:
- Option 21E - 6 ENETS + 1 Superloop or 7 Loops
- Option 51/51C - 1/2 Network Group (16 Loops 0-15)
- Option 61/61C - 1 Full Network Group (32 Loops 0-31)
- Option 71/81/81C with IGS - Up to 5 Network Groups 0-4 (160 Loops 0-159)
- Option 81 & 81C with FNF - Up to 8 Network Groups 0-7 (256 Loops 0-255)
Some background info - from the days before IP!
The system uses 'timeslots' to connect each party on an active call. These timeslots are present on Network Equipment components called Loops. Each Loop has 30 timeslots, and Super-loops have 120 timeslots (4 loops). Loop and Super-loop cards sit in the Network Equipment shelves, there are 16 Loops per Network shelf. 32 loops are called a Group (eg, 2 Network shelves). The Option 81C is called a multi-group system because you can equip up to five Network groups. This was later expanded to 8 Network groups with a dual ring fiber optic network replacing the intergroup cards and intergroup module, providing a maximum of 7680 timeslots!
- What is a Timeslot?
- A timeslot is one (64Kbps) voice channel
- What is a Loop?
- A loop is a collection of 30 timeslots
- What is a Slot?
- A slot is a physical single card location within a network or IPE shelf
- In a Network Shelf, one slot provides two loops, ie: 60 timeslots
- What is a Super Loop?
- 1 Super Loop = 4 Loops
- Thus one Super Loop contains 120 timeslots, and takes up 2 slots in a Network shelf
- What is a Network Shelf?
- A collection of 8 physical slots, or 16 network Loops (4 Super Loops)
- What is a Network Group?
- A pair of Network Shelves (8 Super Loops)
- Summary:
- 1 Loop = 30 timeslots
- 1 Slot = 2 Loops = 60 timeslots
- 1 Super Loop = 2 slots = 4 Loops = 120 timeslots
- 1 Network Shelf = 4 Super Loops = 8 Slots = 16 Loops = 480 timeslots
- 1 Network Group = 2 Network Shelves = 8 Super Loops = 16 Slots = 960 timeslots
- 8 Network Groups = 64 Super Loops = 256 Loops = 7680 timeslots (256 loops x 30 timeslots)