Group, Shelf, Slots and Loops
(Large System)
Physical Meridian M1 Network Loop and Slot assignments. Superloop numbers are multiples of 4, and shown in bold.
With an NT8D04 Superloop card, faceplate connector J2 (lower) is for IPE shelf 0, connector J1 (upper) is for IPE shelf 1.
Network Group |
Network Shelf | Network Shelf Card Slot | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | ||||||||||
▼ Option 51C (0-15) / Option 61C (0-31) ▼ | |||||||||||||||||
0 | 0 | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | ||||||||
1 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | ||||||||||
1 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | |||||||||
17 | 19 | 21 | 23 | 25 | 27 | 29 | 31 | ||||||||||
▼ Option 81C IGS (0-159) ▼ | |||||||||||||||||
1 | 0 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 | ||||||||
33 | 35 | 37 | 39 | 41 | 43 | 45 | 47 | ||||||||||
1 | 48 | 50 | 52 | 54 | 56 | 58 | 60 | 62 | |||||||||
49 | 51 | 53 | 55 | 57 | 59 | 61 | 63 | ||||||||||
2 | 0 | 64 | 66 | 68 | 70 | 72 | 74 | 76 | 78 | ||||||||
65 | 67 | 69 | 71 | 73 | 75 | 77 | 79 | ||||||||||
1 | 80 | 82 | 84 | 86 | 88 | 90 | 92 | 94 | |||||||||
81 | 83 | 85 | 87 | 89 | 91 | 93 | 95 | ||||||||||
3 | 0 | 96 | 98 | 100 | 102 | 104 | 106 | 108 | 110 | ||||||||
97 | 99 | 101 | 103 | 105 | 107 | 109 | 111 | ||||||||||
1 | 112 | 114 | 116 | 118 | 120 | 122 | 124 | 126 | |||||||||
113 | 115 | 117 | 119 | 121 | 123 | 125 | 127 | ||||||||||
4 | 0 | 128 | 130 | 132 | 134 | 136 | 138 | 140 | 142 | ||||||||
129 | 131 | 133 | 135 | 137 | 139 | 141 | 143 | ||||||||||
1 | 144 | 146 | 148 | 150 | 152 | 154 | 156 | 158 | |||||||||
145 | 147 | 149 | 151 | 153 | 155 | 157 | 159 | ||||||||||
5 | 0 | 160 | 162 | 164 | 166 | 168 | 170 | 172 | 174 | ||||||||
161 | 163 | 165 | 167 | 169 | 171 | 173 | 175 | ||||||||||
1 | 176 | 178 | 180 | 182 | 184 | 186 | 188 | 190 | |||||||||
177 | 179 | 181 | 183 | 185 | 187 | 189 | 191 | ||||||||||
▼ Option 81C FNF (0-255) ▼ | |||||||||||||||||
6 | 0 | 192 | 194 | 196 | 198 | 200 | 202 | 204 | 206 | ||||||||
193 | 195 | 197 | 199 | 201 | 203 | 205 | 207 | ||||||||||
1 | 208 | 210 | 212 | 214 | 216 | 218 | 220 | 222 | |||||||||
209 | 211 | 213 | 215 | 217 | 219 | 221 | 223 | ||||||||||
7 | 0 | 224 | 226 | 228 | 230 | 232 | 234 | 236 | 238 | ||||||||
225 | 227 | 229 | 231 | 233 | 235 | 237 | 239 | ||||||||||
1 | 240 | 242 | 244 | 246 | 248 | 250 | 252 | 254 | |||||||||
241 | 243 | 245 | 247 | 249 | 251 | 253 | 255 |
M1 System Sizes:
- Option 51C : 1/2 Network Group: 16 Loops (0-15)
- Option 61C : 1 Full Network Group: 32 Loops (0-31)
- Option 81C with IGS : Up to 5 Network Groups (0-4): 160 Loops (0-159)
- Option 81C with FNF : Up to 8 Network Groups (0-7): 256 Loops (0-255)
IGS = Intergroup Switch
FNF = Fibre Network Fabric (FIJI Ring)
Network Cards:
- QPC414 : ENET (Enhanced Network): Two Loops per card (max. 8 cards per network shelf)
- NT8D04 : XNET (Superloop Network): One Superloop per card (max. 4 cards per network shelf)
A Superloop (XNET) network card physically requires one card slot, though the adjacent slot must remain empty.
The slot next to an ENET card can be equipped with network (ENET, DTI, PRI), and non-network cards (ESDL, MSDL, etc).
IPE controllers (NT8D01) will typically connect to an NT8D04 XNET card, J2 (bottom): IPE Shelf 0, J1 (top): IPE Shelf 1
A network card arrangement example:
An NT8D04 may be placed in a Left (even) or Right (odd) slot (0-7). This is specified when defining the Superloop in LD 97.
Regardless of slot, Superloop numbers are always even and in multiples of 4. Eg, an NT8D04 in slot 3 is Superloop 4.
- Enter
STAT l
in LD 32 to check the status of one or all loops - Enter
DISL l
andENLL l
(in LD 32) to disable/enable a network loop.
Peripheral Signalling Cards:
Each Network shelf requires a QPC43R Peripheral Signalling (PerSig) card, which extends the signaling bus to that shelf.
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For example, if PerSig 0 is out of service, disabled or faulty, then loops 0 - 15 will not function properly.
- Enter
STAT PER x
in LD 32 to check status of PerSig x (x = 0-9, Option 51C, 61C, x = 0-15, 81C with FIJI Ring). - Enter
DSPS x
andENPS x
(in LD 32) to disable/enable. Note, disabling a PerSig card will disable up to 16 loops!
Some background info - from the days before IP!
The Meridian M1 system uses TDM (time division multiplexing) time-slots to connect each party on an active call. These time slots are present on Network Equipment components called Loops. Each Loop has 32 time slots. A Superloop has 128 time slots (four Loops). 32 Loops are called a Group.
Up to 16 loops (or 4 super loops) can be equipped on a single network shelf. The back plane of a network shelf has 32 traces (or links), each of which carries traffic for a single network loop. 2-network shelves together (32 loops) max out the capacity of the back plane, and these two shelves constitute a 'Network Group' or 'Group'.
The Option 81C is a multi-group system because you can equip up to five Network groups (160 loops). This was later expanded (with a fiber ring) to 8 Network groups (256 loops) with a dual ring fiber optic network replacing the intergroup cards and intergroup module. This provided 7680 time slots for 3840 simultaneous conversations.